Mechanical Engineering Journal
|
|
- Gilbert Conley
- 5 years ago
- Views:
Transcription
1 Bulletin of the JSME Mechanical Engineering Journal Vol.4, No.5, 27 Rapid evaluation of fatigue limit using infrared thermography: comparison between two methods for quantifying temperature evolution Ryogo KAWAI*, Takumi YOSHIKAWA*, Yu KUROKAWA*, Yousuke IRIE** and Hirotsugu INOUE* *Tokyo Institute of Technology O-okayama, Meguro, Tokyo , Japan **Panasonic Corporation, AVC Networks Company -5 Matsuo-cho, Kadoma City, Osaka , Japan Received: January 27; Revised: 3 March 27; Accepted: 22 May 27 Abstract The technique of rapid evaluation of fatigue limit using infrared thermography was developed and has been paid attention during the past 3 years. This technique is beneficial because it also makes possible to detect the location of fatigue damage in real products. In the thermographic technique, the fatigue limit is determined based on the temperature evolution with the load amplitude. In this research, two methods for quantifying the temperature evolution from measured temperature variation (mean temperature rise and second harmonic amplitude) as well as two types of infrared camera (quantum and thermal type) are compared with each other in order to assess the applicability of the thermographic technique. Experiments are conducted for double edge notched specimens of type stainless steel. A data processing technique developed by the authors recently is employed in order to determine the fatigue limit appropriately. The results of fatigue limit evaluation are compared with true fatigue limit. In conclusion, it is found that the second harmonic amplitude is not affected by heat conduction and provides sufficiently accurate result. In contrast, the mean temperature rise is affected by heat conduction and should not be applied to objects with high stress concentration. It is also shown that the thermal type camera is not sensitive enough to measure the second harmonic amplitude. Keywords : Fatigue limit, Infrared thermography, Dissipated energy, Notch, Stainless steel. Introduction It is desirable to evaluate the fatigue limit of real engineering products in order to ensure safety and reliability against fatigue damage. However, fatigue test of real products is practically difficult to conduct because it requires huge cost, namely, a large number of loading cycles with a large number of specimens. Therefore, it is demanded to establish a low cost technique for evaluating the fatigue limit of real products. Several techniques for rapid evaluation of the fatigue limit had been studied widely from the beginning of the 2th century. These techniques are based on the evolution of any physical quantity (for example, temperature, elastic modulus, electric resistance) with load amplitude. However, they are less reliable than the standard fatigue test using modern fatigue testing machines (Vitovec and Lazan, 953) and hence are not applied in practice nowadays. In addition, they are basically developed for testing of specimens and are not readily applicable to real products. On the other hand, a technique for rapid evaluation of the fatigue limit using infrared thermography has been developed and paid attention during the past 3 years (Inoue, 2). Although this thermographic technique is based on the same principle as the techniques mentioned above, it has an advantage. Namely, it can visualize the temperature evolution and hence enables to detect location of fatigue damage within the test object. It should be emphasized that this advantage is beneficial especially in the application to real products. The thermographic technique was proposed by Risitano et al. in 986 (La Rosa and Risitano, ). A cyclic loading Paper No.7-9 J-STAGE Advance Publication date: 2 June, 27
2 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) was applied to a steel specimen and the temperature variation of the specimen was measured with infrared thermography. Note that the temperature oscillates around mean value due to the thermoelastic effect. They observed that the mean temperature rise is negligibly small when the stress amplitude is lower than the fatigue limit while it gradually increases with loading cycle when the stress amplitude is higher than the fatigue limit. They categorized the mean temperature rise behavior into three phases: rising phase in the beginning of cyclic loading (Phase ), constant phase after equilibrium (Phase 2), and rapid increasing phase just before the failure (Phase 3). Then they proposed a technique to evaluate the fatigue limit based on either the rate of mean temperature rise in Phase or the mean temperature in Phase 2. Similar technique was also developed by Luong in 992 (Luong, 992). In contrast to Risitano s technique, his technique considers the mean temperature rise not only above but also below the fatigue limit. Brémond pointed out that it is possible to detect the plastic deformation due to cyclic loading by measuring the temperature amplitude at double the loading frequency (Brémond, 995). The energy dissipation is mainly due to the plastic deformation and occurs at both loading and unloading processes of cyclic loading. Since the dissipated energy changes mostly into heat, it is possible to detect the plastic deformation by measuring the second harmonic amplitude of temperature variation. Note that the first harmonic amplitude of temperature variation corresponds to the sum of the principal stresses because of the thermoelastic effect. Later, Krapez et al. (999) verified that the fatigue limit can be also evaluated by the second harmonic amplitude of the temperature variation. As mentioned above, two methods are known for quantifying the temperature evolution: one is the mean temperature rise associated with cyclic loading and the other is the second harmonic amplitude of temperature variation during cyclic loading. amplitude is much smaller and hence more difficult to detect accurately than the mean temperature rise. There have been a number of reports on thermographic technique using one of the two methods. The fatigue limit evaluation based on the mean temperature rise was reported by Luong (992, 998), La Rosa and Risitano (), Curá et al. (22), and De Finis et al. (25). On the other hand, the fatigue limit evaluation based on the second harmonic amplitude was reported by Irie et al. (), and Akai et al. (22). However, comparison between these two methods has been made only by Krapez et al. (999, 2). For wider application of the thermographic technique, the cost of infrared camera should be also considered. The quantum type infrared camera with high sensitivity is usually needed to detect small temperature variation such as the second harmonic amplitude. However, the quantum type infrared camera is much more expensive and less portable than the thermal type infrared camera. On the other hand, the thermal type infrared camera is usually enough to detect the mean temperature rise. It is also worth to assess the applicability of these two type cameras to rapid evaluation of the fatigue limit. In this research, combinations of two methods for quantifying the temperature evolution (mean temperature rise and second harmonic amplitude) and two types of infrared camera (quantum type and thermal type) are compared with each other in order to assess the applicability of the thermographic technique for rapid evaluation of the fatigue limit. 2. Experimental method Type stainless steel was used in this study as one of the typical engineering material. Double edge notched specimens with three different notch root radii R =., 2. and 5. mm (Fig. ) were subjected to test. Table summarizes the stress concentration factor and the true fatigue limit evaluated by conducting the standard fatigue test. The specimen surface was sprayed with matt black paint to make the emissivity high and uniform enough. It is noted that specimen without notch was not considered in this study because applicability of the thermographic technique using both mean temperature rise and second harmonic amplitude to smooth specimen has been already verified so far and also because it is not the aim of this study to investigate the notch effect in fatigue of materials. In addition, it should be noted that the fatigue limit is evaluated in terms of load amplitude instead of stress amplitude in this study, because the aim of this study is to investigate the applicability of the thermographic technique not to materials but to real structures. The fatigue limit of materials must be evaluated by the standard fatigue test. Notched specimen can be considered as one of the simplest example of real structures. 2
3 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) B = 7.5 mm B = 7.5 mm B = 7.5 mm 7 mm 7 mm 7 mm 4 mm 4 mm 4 mm b = 3 mm b = 3 mm b = 3 mm Fig. Type stainless steel specimen with., 2. and 5. mm notch. (Thickness: 3 mm) Table Stress concentration factor and fatigue limit of specimen. Notch root radius [mm] Stress concentration factor Fatigue limit [kn] Sinusoidal tensile load was applied to the specimen with hydraulic servo fatigue testing machine (Shimadzu, Servopulser EHF-LkN or EHF-FBkN), where the stress ratio was zero. The load amplitude was increased from zero to a specified value (8. kn) with a constant increment (. or.2 kn). At each load amplitude, the specimen was applied cyclic loading (75 or 525 cycles) and the temperature variation was measured using a quantum type infrared camera (Cedip, Silver 4M) or a thermal type infrared camera (Optris, PI 45). Tables 2 and 3 show specification and experimental condition for each camera. The loading frequency was determined by considering the performance of the testing machine and the infrared camera. The testing machine can apply cyclic loading to the specimen up to 25 Hz at the highest load amplitude (8. kn). The quantum type camera can measure the temperature variation accurately at frequency more than 5 Hz while the thermal type camera only up to Hz. As a result, in order to measure the second harmonic amplitude of temperature variation, the loading frequency was set to 25 Hz and 5 Hz for quantum and thermal type camera, respectively. Excessive temperature rise of the specimen due to cyclic loading was taken care in order to avoid its influence on the fatigue limit evaluation. An interval time of s was taken between every consecutive cyclic loadings. In the experiment with the quantum type camera, the temperature rise was only about 3 K for R =. mm specimen during the test ( steps of load amplitudes from. kn to 8. kn, namely 4 hours and 37 minutes). In the experiment of the thermal type camera, it was only about 2 K for R =. mm specimen during the test (4 steps of load amplitudes from.2 to 8. kn, namely 3 hours and minutes). Therefore, the temperature rise due to the cyclic loading should have little influence on the fatigue limit in this experiment. The temperature drift was not negligible for the thermal type camera. In order to compensate for the drift, the average temperature variation over an area outside the specimen was subtracted from the temperature variation inside the specimen. This subtraction was applied to all data measured by the thermal type camera. 23
4 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) 3. Data processing Table 2 Specification of infrared camera. Quantum type Thermal type Infrared sensor InSb Microbolometer Pixel size Cooling system Stirling cooler None NETD [mk] 2 4 Maximum frame rate [Hz] 4 Table 3 Experimental condition. Infrared camera Quantum type Thermal type Frame rate [Hz] 249 Fatigue testing machine EHF-LkN EHF-FBkN Loading frequency [Hz] 25 5 Stress ratio Increment of load amplitude [kn]..2 Number of cycles at each load amplitude In the thermographic technique, the fatigue limit is usually determined by detecting the change of increasing rate of the temperature evolution against the load amplitude. However, in order to detect this knee point appropriately, a data processing technique developed by the authors recently (Kawai et al, 25) was employed. The features of this data processing technique are as follows: () The fundamental harmonic amplitude of the temperature variation (corresponding to the sum of the principal stresses because of the thermoelastic effect) is taken instead of the load amplitude. (2) The temperature evolutions below and above the knee point are curve fitted by a quadratic and a linear function of the fundamental harmonic amplitude of the temperature variation, respectively. (3) The best knee point is determined uniquely by the least squares concept (Hayabusa et al, 2). In addition, inappropriate data are omitted by applying the adjusted R-squared concept. (4) This process can be conducted without any human judgement and hence the knee point (namely the fatigue limit) can be determined automatically if appropriate experimental data are available. 4. Results Figure 2 shows a temperature distribution (snapshot) obtained by the quantum type camera at 6 kn load amplitude for R = 5. mm specimen. The fatigue limit was evaluated using the temperature variation data obtained at the notch root shown in Fig. 2. Similar pixel was selected in all cases Evaluation Point Fig. 2 The pixel used for fatigue limit evaluation. 24
5 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) Figure 3 shows temperature variation measured by each camera at load amplitude of 8. kn for R = mm specimen. It is observed that the mean temperature increases gradually with time and also that the temperture oscillates around the mean temperature due to the thermoelastic effect. For the quantum type camera, the mean temperature gradient instead of the mean temperature rise was evaluated by the increasing rate of mean temperature in the range from 22 to 3 s before reaching equilibrium (Phase ) as shown in Fig. 3(a). On the other hand, for the thermal type camera, the mean temperature rise was evaluated by the difference between mean temperatures before starting the cyclic loading and after reaching equilibrium (Phase 2). The mean temperature after reaching equilibrium was determined by average temperature in the range from to 5 s as shown in Fig. 3(b). amplitude was evaluated by Fourier transform of the temperature variation in the same range for each type camera. 37 Phase Time [s] (a) Quantum type Phase Phase Time [s] 32 (b) Thermal type Fig. 3 Temperature variation measured at the notch root (8. kn load amplitude, R =. mm). Figure 4 shows the temperature amplitude spectrum obtained by each type camera at load amplitude of 7 kn for R = 5. mm specimen. As shown in Figs. 4(a) and (c), the fundamental harmonic amplitude is clearly detected by both type cameras. However, as shown in Figs. 4(b) and (d), the second harmonic amplitude is detected only by the quantum type camera. It is difficult to detect the second harmonic amplitude by the thermal type camera. From result of preliminary experiment, it was found that the second harmonic amplitude was detected successfully with the quantum type camera at loading frequency Hz. Therefore, it is considered that the second harmonic amplitude can be also detected with the quantum type camera even at loading frequency 5 Hz. Thus, the difficulty in detecting the second harmonic amplitude by the thermal type camera is not due to the low loading frequency but insufficient sensitivity. 25
6 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) Temperature Temperature Frequency [Hz] (a) Quantum type Frequency [Hz] Frequency [Hz] (b) Quantum type (Enlarged) Frequency [Hz] (c) Thermal type (d) Thermal type (Enlarged) Fig. 4 Frequency spectrum of temperature variation (7 kn load amplitude, R = 5. mm). The temperature distributions (snapshots) obtained by both type cameras at several load amplitudes for R = 5. mm specimen are shown in Figs. 5 and 6, respectively. In every cases, temperature gradient along the longitudinal direction of the specimen is observed. This is caused by the heat generated by the actuator of the testing machine because the actuator is located below the specimen for the thermal type camera and vice versa for the quantum type camera. Apart from that, little temperature rise is observed around the notch when the load amplitude is lower than the fatigue limit (6.4 kn). On the other hand, when the load amplitude is higher than the fatigue limit, a temperature rise is clearly observed around the notch. Figure 7 shows the second harmonic amplitude distribution obtained by the quantum type camera for the same cases. amplitude around the notch increases gradually with the load amplitude even lower than the fatigue limit. This suggests that the second harmonic amplitude is more sensitive to detect the energy dissipation than the mean temperature rise. It is also noted that the second harmonic amplitude is almost uniformly distributed over the specimen except for the notch area. This means that the second harmonic amplitude is not influenced very much by the heat conduction inside the specimen. The knee point was evaluated for each specimen by applying the data processing technique developed by the authors recently (Kawai et al, 25). Figure 8 shows examples of curve fitting for determining the knee point of R = 2. mm specimen. The open circular marks represent data excluded according to the adjusted R-squared concept. The knee point is determined as the cross point of the quadratic curve (red) and the linear curve (blue). It is clear that the knee point is determined successfully except for the second harmonic amplitude obtained by the thermal type camera. Figure 9 shows comparison between the fatigue limits evaluated by different techniques and cameras. Each result is average value for three specimens. The black line shows the true fatigue limit for each notch radius. The fatigue limit evaluated by the second harmonic amplitude obtained by the quantum type camera coincides well with the true fatigue limit for all specimens tested. On the other hand, the fatigue limit evaluated by the mean temperature rise is rather close to the true fatigue limit only for R = 5. mm specimen but is much larger for R = 2. and. mm specimens regardless of camera type. Temperature Temperature 5 26
7 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) (a) 2 kn.5 (b) 4 kn (c) 6 kn (d) 8 kn Fig. 5 Temperature distribution (snapshots) obtained by thermal type camera (R = 5. mm) (a) 2 kn (b) 4 kn (c) 6 kn (d) 8 kn Fig. 6 Temperature distribution (snapshots) obtained by quantum type camera (R = 5. mm). 27
8 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) (a) 2 kn (b) 4 kn (c) 6 kn (d) 8 kn Fig. 7 Second harmonic amplitude distribution measured by quantum type camera (R = 5. mm). 4 2 (a) Second harmonic amplitude, Quantum The fundamental harmonic The fundamental harmonic Mean temperature gradient [mk/cycle] The fundamental harmonic (b) Mean temerature rise, Quantum The fundamental harmonic (c) Second harmonic amplitude, Thermal (d) Mean temerature rise, Thermal Fig. 8 Curve fitting for determining the fatigue limit (R = 2. mm). 28
9 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) Fatigue limit [kn] Fatigue limit Second harmonic amplitude (Quantum) Mean temperature rise (Quantum) Mean temperature rise (Thermal) Notch root radius [mm] Fig. 9 The results of fatigue limit evaluation. 5. Discussion It has been found that the fatigue limit cannot be evaluated accurately by the mean temperature rise as shown in Fig. 9. Figure shows distributions of the second harmonic amplitude and the mean temperature rise obtained by the quantum type camera at the load amplitude 7 kn for R =. mm specimen. The temperature evolution is observed only in the vicinity of the notch in Fig. (a) but everywhere inside the specimen in Fig. (b). Figure shows the second harmonic amplitude and the mean temperature rise obtained by the quantum type camera at Point and 2 indicated in Fig. (b). Although the stresses are quite different between Point and 2, the mean temperature rises at these points are similar. This should be due to the diffusion of heat generated around the notch root. In contrast, the second harmonic amplitudes at Point and 2 are quite different. Since heat is generated by energy dissipation associated with cyclic loading only in the vicinity of the notch root, heat conduction occurs due to the temperature gradient between the notch root and the surrounding area. As the load amplitude becomes larger, the heat generation also becomes larger and hence the heat conduction becomes more significant. Consequently, the relationship between the load amplitude and the mean temperature rise will be distorted due to the heat conduction, which will affect the fatigue limit evaluation. Furthermore, if the notch root radius becomes smaller, the heat generation becomes larger and more localized even if the load amplitude is unchanged and hence the heat conduction becomes more remarkable. As a result, the mean temperature rise is affected by the heat conduction inside the specimen and, therefore, should not be applied to high stress concentrated part. In this study, the loading frequencies employed for the two types of infrared camera were different each other. The heat generated per unit time changes with the loading frequency and hence the temperature variation inside the specimen is affected by the loading frequency. Therefore, the fatigue limit evaluated by this technique might be affected by the loading frequency. For this reason, the influence of the loading frequency on the fatigue limit evaluation should be studied further. Nevertheless, it can be said that the fatigue limit evaluation based on the mean temperature rise is not appropriate for the high stress concentrated part. 29
10 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) (a) Second harmonic amplitude (b) Mean temperature rise Fig. Distribution of temperature evolution obtained by quantum type camera (7 kn load amplitude, R =. mm). Mean temperature gradient [mk/cycle] Load amplitude [kn] (a) Second harmonic amplitude, Point (b) Second harmonic amplitude, Point Load amplitude [kn] Mean temperature gradient [mk/cycle] (c) Mean temerature rise, Point (d) Mean temerature rise, Point Fig. Temperature evolution (R =. mm) Load amplitude [kn] Load amplitude [kn] 6. Conclusions In this study, the applicability of the infrared technique for rapid evaluation of the fatigue limit has been assessed by comparing combinations of two methods for quantifying the temperature evolution and two types of infrared camera. The following conclusions are obtained. () The thermal type camera is not sensitive enough to measure the second harmonic amplitude. (2) The mean temperature rise is affected by the heat conduction and should not be used to evaluate the fatigue limit of objects having notch with radius less than 2. mm. (3) amplitude is not affected the heat conduction and provides sufficiently accurate evaluation of the fatigue limit. 2
11 Kawai, Yoshikawa, Kurokawa, Irie and Inoue, Mechanical Engineering Journal, Vol.4, No.5 (27) References Akai, A., Shiozawa, D. and Sakagami, T., Fatigue limit evaluation for austenitic stainless steel, Journal of Society of Materials Science, Vo. 6, No. 2 (22), pp (in Japanese). Brémond, P., La thermographie infraroude pour voir les contraintes, Mesures, No.673 (995), pp Curá, F., Gallinatti, A. E. and Sesana, R., Dissipative aspects in thermographic methods, Fatigue & Fracture of Engineering Materials & Structures, Vol. 35 (22), pp De Finis, R., Palumbo, D., Ancona, F. and Galietti, U., Fatigue limit evaluation of various martensitic stainless steels with new robust thermographic data analysis, International Journal of Fatigue, Vol. 74 (25), pp Hayabusa, K., Nakamoto, H., Inaba, K. and Kishimoto, K., Evaluation on rotational bending fatigue limits using thermography, Ebara Engineering Review, No.23 (2), pp.3 6 (in Japanese). Inoue, H., Rapid evaluation of fatigue limits using infrared thermography, Journal of JSNDI, Vol. (2), pp (in Japanese). Irie, Y., Inoue, H., Mori, T. and Takao, M., Evaluation fatigue limit of notched specimen by measurement of dissipated energy, Transactions of the Japan Society of Mechanical Engineers, Series A, Vol. 76 (), pp.4-42 (in Japanese). Kawai, R., Kurokawa, Y., Irie, Y. and Inoue, H., Reliability improvement of fatigue limit evaluation method based on temperature variation measurement, Proceedings of the JSME M&M 25 Conference, No.5-6 (25), Paper No. OS (in Japanese). Krapez, J-C., Pacou, D. and Bertin, C., Application of lock-in thermography to rapid evaluation of fatigue limit in metals, Proceedings of the 5th International Workshop on Advanced Infrared Technology and Applications, Venice, Italy (999), pp Krapez, J-C. and Pacou, D., Thermography detection of early thermal effects during fatigue tests of steel and aluminium samples, AIP Conference Proceedings, Vol. 65 (2), pp La Rosa, G. and Risitano, A., Thermographic methodology for rapid determination of the fatigue limit of materials and mechanical components, International Journal of Fatigue, Vol.22, No. (), pp Luong, M.P., Infrared thermography of fatigue in metals, Proceedings of SPIE, Vol.682 (992), pp Luong, M.P., Fatigue limit evaluation of metals using as infrared thermographic technique, Mechanics of Materials, Vol. 28 (998), pp Vitovec, F. H. and Lazan, B. J., Review of previous work on short-time tests for predicting fatigue properties of materials, WADC Technical Report, No (953), Wright Air Development Center. 2
Analysis of Thermal Stress in Fatigue Fracture Specimen using Lock-in Thermography
Analysis of Thermal Stress in Fatigue Fracture Specimen using Lock-in Thermography Won-Tae Kim*, Man-Yong Choi**, Jung-Hak Park** * Major of Bio-mechanical Engineering, Kongju National University, Chungnam,
More informationMEASUREMENT OF THERMAL STRESS AND PREDICTION OF FATIGUE FOR STS USING LOCK-IN THERMOGRAPHY
12 th A-PCNDT 2006 Asia-Pacific Conference on NDT, 5 th 10 th Nov 2006, Auckland, New Zealand MEASUREMENT OF THERMAL STRESS AND PREDICTION OF FATIGUE FOR STS USING LOCK-IN THERMOGRAPHY Won-Tae Kim 1+,
More informationFATIGUE DAMAGE ASSESMENT USING THERMOELASTIC STRESS ANALYSIS
FATIGUE DAMAGE ASSESMENT USING THERMOELASTIC STRESS ANALYSIS F.A. Díaz, E.A. Patterson and J.R. Yates The University of Sheffield, Department of Mechanical Engineering, Mappin street, Sheffield S10 3JD,
More informationCombined Acoustic Emission and Thermographic Testing of Fibre Composites
19 th World Conference on Non-Destructive Testing 2016 Combined Acoustic Emission and Thermographic Testing of Fibre Composites Matthias GOLDAMMER 1, Markus G. R. SAUSE 2, Detlef RIEGER 1 1 Siemens AG
More informationAPPLICATION OF THERMOGRAPHY TO ANALYSIS OF THERMAL STRESS IN THE NDT FOR COMPACT TENSILE SPECIMEN
12 th A-PCNDT 2006 Asia-Pacific Conference on NDT, 5 th 10 th Nov 2006, Auckland, New Zealand APPLICATION OF THERMOGRAPHY TO ANALYSIS OF THERMAL STRESS IN THE NDT FOR COMPACT TENSILE SPECIMEN Man-Yong
More informationExtended Thermoelastic Stress Analysis Applied to Carbon Steel and CFRP
2nd International Symposium on NDT in Aerospace 2010 - We.5.A.3 Extended Thermoelastic Stress Analysis Applied to Carbon Steel and CFRP Robin PLUM *, Justus MEDGENBERG **, Marco MERZBACHER ***, Thomas
More informationApplication of thermal methods for characterization of steel welded joints
10 th International Conference on Quantitative InfraRed Thermography July 27-30, 2010, Québec (Canada) Application of thermal methods for characterization of steel welded joints by U. Galietti*, D. Palumbo*
More informationDEVELOPMENT OF THERMOELASTIC STRESS ANALYSIS AS A NON-DESTRUCTIVE EVALUATION TOOL
DEVELOPMENT OF THERMOELASTIC STRESS ANALYSIS AS A NON-DESTRUCTIVE EVALUATION TOOL S. Quinn*, R.K. Fruehmann and J.M. Dulieu-Barton School of Engineering Sciences University of Southampton Southampton SO17
More informationThermal method to determine crack nucleation conditions under fretting loading
11 th International Conference on Quantitative InfraRed Thermography Thermal method to determine crack nucleation conditions under fretting loading by B. Berthel* and S. Fouvry* *LTDS, Ecole Centrale de
More informationA fatigue limit diagram for plastic rail clips
Computers in Railways XIV 839 A fatigue limit diagram for plastic rail clips S. Tamagawa, H. Kataoka & T. Deshimaru Department of Track Structures and Components, Railway Technical Research Institute,
More informationSUB-SURFACE DAMAGE LOCATION AND IDENTIFICATION USING INFRA-RED TECHNIQUES
SUB-SURFACE DAMAGE LOCATION AND IDENTIFICATION USING INFRA-RED TECHNIQUES T.R. Emery 1, J. M. Dulieu-Barton 1, P.R. Cunningham 2 1 University of Southampton, School of Engineering Sciences, SO17 1BJ, UK
More informationPulsed Thermography: evaluation and quantitative analysis of defects through different post-processing algorithms
14 th Quantitative InfraRed Thermography Conference Pulsed Thermography: evaluation and quantitative analysis of defects through different post-processing algorithms by E. D Accardi*, D. Palumbo*, R. Tamborrino*,
More informationQUANTITATIVE ANALYSIS OF ACOUSTIC EMISSION WAVEFORMS AND. M.Ohtsu Department of Civil and Environmental Eng. Kumamoto University Kumamoto 860, Japan
QUANTITATIVE ANALYSIS OF ACOUSTIC EMISSION WAVEFORMS AND PRACTICAL APPLICATION TO CIVIL STRUCTURES IN JAPAN M.Ohtsu Department of Civil and Environmental Eng. Kumamoto University Kumamoto 860, Japan INTRODUCTION
More informationVolume 2 Fatigue Theory Reference Manual
Volume Fatigue Theory Reference Manual Contents 1 Introduction to fatigue 1.1 Introduction... 1-1 1. Description of the applied loading... 1-1.3 Endurance curves... 1-3 1.4 Generalising fatigue data...
More informationFinite element simulation of residual stresses in laser heating
IAS-2008-66-546ST Finite element simulation of residual stresses in laser heating G. H. Farrahi 1, M. Sistaninia 2, H. Moeinoddini 3 1,2-School of Mechanical Engineering, Sharif University of Technology,
More informationBioMechanics and BioMaterials Lab (BME 541) Experiment #5 Mechanical Prosperities of Biomaterials Tensile Test
BioMechanics and BioMaterials Lab (BME 541) Experiment #5 Mechanical Prosperities of Biomaterials Tensile Test Objectives 1. To be familiar with the material testing machine(810le4) and provide a practical
More informationDEVELOPMENT OF TEST GUIDANCE FOR COMPACT TENSION FRACTURE TOUGHNESS SPECIMENS CONTAINING NOTCHES INSTEAD OF FATIGUE PRE-CRACKS
Transactions, SMiRT-23 Division II, Paper ID 287 Fracture Mechanics and Structural Integrity DEVELOPMENT OF TEST GUIDANCE FOR COMPACT TENSION FRACTURE TOUGHNESS SPECIMENS CONTAINING NOTCHES INSTEAD OF
More informationDynamic Response of Timber-Plywood Joints under Forced Harmonic Vibrations
Dynamic Response of Timber-Plywood Joints under Forced Harmonic Vibrations Takeyoshi Uematsu Northern Regional Building Research Institute, Hokkaido Research Organization, Asahikawa, Japan. Takuro Hirai,
More informationApplication Note. No. 51. Visualization of Progress of Internal Damage in Carbon Fiber Composite Materials and Mechanism of Impact Strength
LAAN-C-XX-E031 Chemical Industry Materials Visualization of Progress of Internal Damage in Carbon Fiber Composite Materials and Mechanism of Impact Strength Tsuyoshi Matsuo * 1, Fumiaki Yano * 2 and Masami
More informationA detection of deformation mechanisms using infrared thermography and acoustic emission
Applied Mechanics and Materials Online: 2014-01-03 ISSN: 1662-7482, Vol. 474, pp 315-320 doi:10.4028/www.scientific.net/amm.474.315 2014 Trans Tech Publications, Switzerland A detection of deformation
More informationThermoelastic study of an aluminum component using an automatic correction procedure of data acquired in non-adiabatic conditions
Thermoelastic study of an aluminum component using an automatic correction procedure of data acquired in non-adiabatic conditions More info about this article: http://www.ndt.net/?id=20747 Abstract by
More informationSpecial edition paper
Development of New Aseismatic Structure Using Escalators Kazunori Sasaki* Atsushi Hayashi* Hajime Yoshida** Toru Masuda* Aseismatic reinforcement work is often carried out in parallel with improvement
More informationAN EXPERIMENTAL STUDY ON INELASTIC BEHAVIOR AND RESTORING FORCE CHARACTERISTICS OF VIBRATION CONTROL DEVICE AS STEEL SCALING-FRAME
The th Asia Conference on Earthquake Engineering October 16-18, 214 AN EXPERIMENTAL STUDY ON INELASTIC BEHAVIOR AND RESTORING FORCE CHARACTERISTICS OF VIBRATION CONTROL DEVICE AS STEEL SCALING-FRAME Shinichiro
More informationMEASUREMENT OF STRESS PATTERN ON ROLL BEARING SUPPORTS BY THERMOELASTICITY
MEASUREMENT OF STRESS PATTERN ON ROLL BEARING SUPPORTS BY THERMOELASTICITY G. Brustenga, R. Marsili, J. Pirisinu, G.L. Rossi Università degli Studi di Perugia Dipartimento di ingegneria Industriale Via
More information2 Experiment of GFRP bolt
16 TH INTERNATIONAL CONFERENCE ON COMPOSITE MATERIALS FATIGUE LIFE EVALUATION OF BOLT MADE OF WOVEN FABRIC FRP Takeshi INOUE*, Hiroaki NAKAI**, Tetsusei KURASHIKI**, Masaru ZAKO**, Yuji KOMETANI*** *Graduate
More informationME 207 Material Science I
ME 207 Material Science I Chapter 3 Properties in Tension and Compression Dr. İbrahim H. Yılmaz http://web.adanabtu.edu.tr/iyilmaz Automotive Engineering Adana Science and Technology University Introduction
More informationDetection of Subsurface Defects using Active Infrared Thermography
Detection of Subsurface Defects using Active Infrared Thermography More Info at Open Access Database www.ndt.net/?id=15141 Suman Tewary 1,2,a, Aparna Akula 1,2, Ripul Ghosh 1,2, Satish Kumar 2, H K Sardana
More informationStrength Study of Spiral Flexure Spring of Stirling Cryocooler
Sensors & Transducers 2013 by IFSA http://www.sensorsportal.com Strength Study of Spiral of Stirling Cryocooler WANG Wen-Rui, NIE Shuai, ZHANG Jia-Ming School of Mechanical Engineering, University of Science
More information10th Asian Regional Conference of IAEG (2015)
0th Asian Regional Conference of IAEG (05) Normalized Pore Water Pressure Ratio and Post-Cyclic Settlement of Saturated Clay Subjected to Undrained Uni-Directional and Multi-Directional Cyclic Shears TRAN
More informationThe science of elasticity
The science of elasticity In 1676 Hooke realized that 1.Every kind of solid changes shape when a mechanical force acts on it. 2.It is this change of shape which enables the solid to supply the reaction
More informationUltrasonic Monitoring and Evaluation of Very High Cycle Fatigue of Carbon Fiber Reinforced Plastics
More 7th International Workshop NDT in Progress Fraunhofer Institute for Nondestructive Testing Dresden branch IZFP-D, Germany November 7-8, 2013 Ultrasonic Monitoring and Evaluation of Very High Cycle
More informationDevelopments in Visual and Other NDE Methods II
Developments in Visual and Other NDE Methods II Defect Detection using Dual-Beam Shearography and Lock-in Infrared Thermography S-W. La, K-S. Kim, H-C. Jung, H-S.Chang, S-O. Jang, K-S. Kim, Chosun University,
More informationBIAXIAL STRENGTH INVESTIGATION OF CFRP COMPOSITE LAMINATES BY USING CRUCIFORM SPECIMENS
BIAXIAL STRENGTH INVESTIGATION OF CFRP COMPOSITE LAMINATES BY USING CRUCIFORM SPECIMENS H. Kumazawa and T. Takatoya Airframes and Structures Group, Japan Aerospace Exploration Agency 6-13-1, Ohsawa, Mitaka,
More informationAvailable online at ScienceDirect. 5th Fatigue Design Conference, Fatigue Design 2013
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 66 ( 2013 ) 626 634 5th Fatigue Design Conference, Fatigue Design 2013 Fatigue Damage Analysis on Aluminium Alloy Specimens
More informationCIVL222 STRENGTH OF MATERIALS. Chapter 6. Torsion
CIVL222 STRENGTH OF MATERIALS Chapter 6 Torsion Definition Torque is a moment that tends to twist a member about its longitudinal axis. Slender members subjected to a twisting load are said to be in torsion.
More informationLASER SPOT THERMOGRAPHY FOR CRACK DETECTION IN ALUMINUM STRUCTURES
7 th International Symposium on NDT in Aerospace We.5.A.5 LASER SPOT THERMOGRAPHY FOR CRACK DETECTION IN ALUMINUM STRUCTURES Jakub ROEMER 1, Tadeusz UHL 1, Łukasz PIECZONKA 1 1 AGH University of Science
More informationAn Acoustic Emission Approach to Assess Remaining Useful Life of Aging Structures under Fatigue Loading PI: Mohammad Modarres
An Acoustic Emission Approach to Assess Remaining Useful Life of Aging Structures under Fatigue Loading PI: Mohammad Modarres Outline Objective Motivation, acoustic emission (AE) background, approaches
More informationSiping Road 1239, , Shanghai, P.R. China
COMPARISON BETWEEN LINEAR AND NON-LINEAR KINEMATIC HARDENING MODELS TO PREDICT THE MULTIAXIAL BAUSCHINGER EFFECT M.A. Meggiolaro 1), J.T.P. Castro 1), H. Wu 2) 1) Department of Mechanical Engineering,
More informationNumerical Modelling of Dynamic Earth Force Transmission to Underground Structures
Numerical Modelling of Dynamic Earth Force Transmission to Underground Structures N. Kodama Waseda Institute for Advanced Study, Waseda University, Japan K. Komiya Chiba Institute of Technology, Japan
More informationNew Die Attach Adhesives Enable Low-Stress MEMS Packaging
New Die Attach Adhesives Enable Low-Stress MEMS Packaging Dr. Tobias Königer DELO Industrial Adhesives DELO-Allee 1; 86949 Windach; Germany Tobias.Koeniger@DELO.de Phone +49 8193 9900 365 Abstract High
More informationDesign Optimization of Stress Relief Grooves in Lever Guide of Pressure Vessel for Food Processing
Open Journal of Safety Science and Technology, 2012, 2, 1-7 http://dx.doi.org/10.4236/ojsst.2012.21001 Published Online March 2012 (http://www.scirp.org/journal/ojsst) Design Optimization of Stress Relief
More informationDAMAGE MECHANICS MODEL FOR OFF-AXIS FATIGUE BEHAVIOR OF UNIDIRECTIONAL CARBON FIBER-REINFORCED COMPOSITES AT ROOM AND HIGH TEMPERATURES
DAMAGE MECHANICS MODEL FOR OFF-AXIS FATIGUE BEHAVIOR OF UNIDIRECTIONAL CARBON FIBER-REINFORCED COMPOSITES AT ROOM AND HIGH TEMPERATURES M. Kawai Institute of Engineering Mechanics University of Tsukuba,
More informationDynamic analysis of a reinforced concrete shear wall with strain rate effect. Synopsis. Introduction
Dynamic analysis of a reinforced concrete shear wall with strain rate effect Synopsis A simplified analysis method for a reinforced concrete shear wall structure considering strain rate effects is presented.
More informationEffects with a matrix crack on monitoring by electrical resistance method
Adv. Composite Mater., Vol. 13, No. 2, pp. 107 120 (2004) VSP 2004. Also available online - www.vsppub.com Effects with a matrix crack on monitoring by electrical resistance method AKIRA TODOROKI, MIHO
More informationCumulative Damage by Miner s Rule and by Energetic Analisys
Copyright 2012 Tech Science Press SDHM, vol.8, no.2, pp.91-109, 2012 Cumulative Damage by Miner s Rule and by Energetic Analisys A. Risitano 1, D. Corallo 1 and G. Risitano 2 Abstract: According to Miner
More informationPOST-CYCLIC RECOMPRESSION CHARACTERISTICS OF A CLAY SUBJECTED TO UNDRAINED UNI-DIRECTIONAL AND MULTI-DIRECTIONAL CYCLIC SHEARS
NCEE Tenth U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering July -5, 4 Anchorage, Alaska POST-CYCLIC RECOMPRESSION CHARACTERISTICS OF A CLAY SUBJECTED TO UNDRAINED
More informationIOP Conference Series: Materials Science and Engineering. Related content PAPER OPEN ACCESS
IOP Conference Series: Materials Science and Engineering PAPER OPEN ACCESS Distributions of energy storage rate and microstructural evolution in the area of plastic strain localization during uniaxial
More informationSTRUCTURAL DYNAMICS BASICS:
BASICS: STRUCTURAL DYNAMICS Real-life structures are subjected to loads which vary with time Except self weight of the structure, all other loads vary with time In many cases, this variation of the load
More informationDissipation measurements during ultrasonic fatigue tests
Dissipation measurements during ultrasonic fatigue tests Antoine Blanche, Nicolas Ranc, Véronique Favier, André Chrysochoos To cite this version: Antoine Blanche, Nicolas Ranc, Véronique Favier, André
More informationHYSTERETIC PERFORMANCE OF SHEAR PANEL DAMPERS OF ULTRA LOW- YIELD-STRENGTH STEEL FOR SEISMIC RESPONSE CONTROL OF BUILDINGS
48 HYSTERETIC PERFORMANCE OF SHEAR PANEL DAMPERS OF ULTRA LOW- YIELD-STRENGTH STEEL FOR SEISMIC RESPONSE CONTROL OF UILDINGS Kiyoshi TANAKA And Yasuhito SASAKI SUMMARY Energy dissipating members play an
More informationEffect of object-to-camera distance on temperature and spatial resolution of a Thermal imaging system FLIR SC 5000
Effect of object-to-camera distance on temperature and spatial resolution of a Thermal imaging system FLIR SC 5000 B. B. Lahiri, S. Bagavathiappan, John Philip, B.P.C. Rao & T. Jayakumar Non-Destructive
More informationRutgers University Department of Physics & Astronomy. 01:750:271 Honors Physics I Fall Lecture 19. Home Page. Title Page. Page 1 of 36.
Rutgers University Department of Physics & Astronomy 01:750:271 Honors Physics I Fall 2015 Lecture 19 Page 1 of 36 12. Equilibrium and Elasticity How do objects behave under applied external forces? Under
More informationNUMERICAL AND EXPERIMENTAL STUDY OF FAILURE IN STEEL BEAMS UNDER IMPACT CONDITIONS
Blucher Mechanical Engineering Proceedings May 2014, vol. 1, num. 1 www.proceedings.blucher.com.br/evento/10wccm NUMERICAL AND EXPERIMENTAL STUDY OF FAILURE IN STEEL BEAMS UNDER IMPACT CONDITIONS E. D.
More informationFIS Specifications for Flex Poles (Edition May 2008) Original Text: German
FIS Specifications for Flex Poles (Edition May 2008) Original Text: German 1 Field of Application and Basic Information The following FIS specifications for flex poles are intended to ensure that flex
More informationInternational Journal of Solids and Structures
International Journal of Solids and Structures 47 (2010) 875 880 Contents lists available at ScienceDirect International Journal of Solids and Structures journal homepage: www.elsevier.com/locate/ijsolstr
More informationD : SOLID MECHANICS. Q. 1 Q. 9 carry one mark each. Q.1 Find the force (in kn) in the member BH of the truss shown.
D : SOLID MECHANICS Q. 1 Q. 9 carry one mark each. Q.1 Find the force (in kn) in the member BH of the truss shown. Q.2 Consider the forces of magnitude F acting on the sides of the regular hexagon having
More information[5] Stress and Strain
[5] Stress and Strain Page 1 of 34 [5] Stress and Strain [5.1] Internal Stress of Solids [5.2] Design of Simple Connections (will not be covered in class) [5.3] Deformation and Strain [5.4] Hooke s Law
More information5. STRESS CONCENTRATIONS. and strains in shafts apply only to solid and hollow circular shafts while they are in the
5. STRESS CONCENTRATIONS So far in this thesis, most of the formulas we have seen to calculate the stresses and strains in shafts apply only to solid and hollow circular shafts while they are in the elastic
More informationRole of hysteretic damping in the earthquake response of ground
Earthquake Resistant Engineering Structures VIII 123 Role of hysteretic damping in the earthquake response of ground N. Yoshida Tohoku Gakuin University, Japan Abstract Parametric studies are carried out
More information6.730 Physics for Solid State Applications
6.730 Physics for Solid State Applications Lecture 5: Specific Heat of Lattice Waves Outline Review Lecture 4 3-D Elastic Continuum 3-D Lattice Waves Lattice Density of Modes Specific Heat of Lattice Specific
More informationThermography Detection on The Fatigue Damage of Reactor Pressure Vessel (RPV) Steels
Thermography Detection on The Fatigue Damage of Reactor Pressure Vessel (RPV) Steels B. Yang, P.K. Liaw, D. Fielden University of Tennessee J.Y. Huang & R.C. Kuo Institute of Nuclear Energy Research, Taiwan
More informationMMJ1133 FATIGUE AND FRACTURE MECHANICS A - INTRODUCTION INTRODUCTION
A - INTRODUCTION INTRODUCTION M.N.Tamin, CSMLab, UTM Course Content: A - INTRODUCTION Mechanical failure modes; Review of load and stress analysis equilibrium equations, complex stresses, stress transformation,
More informationNORMAL STRESS. The simplest form of stress is normal stress/direct stress, which is the stress perpendicular to the surface on which it acts.
NORMAL STRESS The simplest form of stress is normal stress/direct stress, which is the stress perpendicular to the surface on which it acts. σ = force/area = P/A where σ = the normal stress P = the centric
More informationParametric Study of Shaft Subjected To Pure Bending
Page167 Parametric Study of Shaft Subjected To Pure Bending Amar Kumar Patel*, Akash Kumar Patel**, Prajnasu Biswal***, & Satya Narayan Tripathy**** *Mechanical Department, Gandhi Institute of Engineering
More informationCracked concrete structures under cyclic load
Cracked concrete structures under cyclic load Fabrizio Barpi & Silvio Valente Department of Structural and Geotechnical Engineering, Politecnico di Torino, Torino, Italy ABSTRACT: The safety of cracked
More informationFME461 Engineering Design II
FME461 Engineering Design II Dr.Hussein Jama Hussein.jama@uobi.ac.ke Office 414 Lecture: Mon 8am -10am Tutorial Tue 3pm - 5pm 10/1/2013 1 Semester outline Date Week Topics Reference Reading 9 th Sept 1
More informationAnalysis of Thermal Diffusivity of Metals using Lock-in Thermography
Analysis of Thermal Diffusivity of Metals using Lock-in Thermography by F. Wagner*, T. Malvisalo*, P. W. Nolte**, and S. Schweizer** * Department of Electrical Engineering, South Westphalia University
More informationAPPLICATION OF ACOUSTIC EMISSION METHOD DURING CYCLIC LOADING OF CONCRETE BEAM
More info about this article: http://www.ndt.net/?id=21866 Abstract IX th NDT in PROGRESS October 9 11, 2017, Prague, Czech Republic APPLICATION OF ACOUSTIC EMISSION METHOD DURING CYCLIC LOADING OF CONCRETE
More informationAn innovative method to measure stress distribution of a wind turbine model by thermoelasticity
An innovative method to measure stress distribution of a wind turbine model by thermoelasticity F. Castellani, M. Malerba, R. Marsili, A. Salviuolo Università degli Studi di Perugia - Dipartimento di Ingegneria
More informationFundamentals of Durability. Unrestricted Siemens AG 2013 All rights reserved. Siemens PLM Software
Fundamentals of Durability Page 1 Your single provider of solutions System simulation solutions 3D simulation solutions Test-based engineering solutions Engineering services - Deployment services Troubleshooting
More informationFRICTION SLIPPING BEHAVIOR BETWEEN CONCRETE AND STEEL -AIMING THE DEVELOPMENT OF BOLTED FRICTION- SLIPPING JOINT -
FRICTION SLIPPING BEHAVIOR BETWEEN CONCRETE AND STEEL -AIMING THE DEVELOPMENT OF BOLTED FRICTION- SLIPPING JOINT - Tomokazu Yoshioka, Masamichi Ohkubo Kyushu Institute of Design, Japan Abstract The authors
More informationAn Acoustic Emission Approach to Assess Remaining Useful Life of Aging Structures under Fatigue Loading
An Acoustic Emission Approach to Assess Remaining Useful Life of Aging Structures under Fatigue Loading Mohammad Modarres Presented at the 4th Multifunctional Materials for Defense Workshop 28 August-1
More informationNew data analysis to evaluate defects in composite materials using microwaves thermography
11 th International Conference on Quantitative InfraRed Thermography New data analysis to evaluate defects in composite materials using microwaves thermography by U. Galietti*, D. Palumbo*, G. Calia* and
More informationObservation of Magnetic Flux Density Distribution around Fatigue Crack and Application to Non-Destructive Evaluation of Stress Intensity Factor
Available online at www.sciencedirect.com Procedia Engineering 10 (2011) 881 886 ICM11 Observation of Magnetic Flux Density Distribution around Fatigue Crack and Application to Non-Destructive Evaluation
More informationUltrasonic and optical stimulation in IR thermographic NDT of impact damage in carbon composites
More Info at Open Access Database www.ndt.net/?id=17683 Ultrasonic and optical stimulation in IR thermographic NDT of impact damage in carbon composites Abstract by V. Vavilov*, W. Świderski** and D. Derusova*
More informationMechanical Properties of Materials
Mechanical Properties of Materials Strains Material Model Stresses Learning objectives Understand the qualitative and quantitative description of mechanical properties of materials. Learn the logic of
More informationDefect detection with thermal imaging and phase shifting methods in lock-in thermography
More info about this article: http://www.ndt.net/?id=20672 Defect detection with thermal imaging and phase shifting methods in lock-in thermography Wontae Kim *, Ranjit Shrestha * and Manyong Choi ** *
More informationThermal behavior study of the mold surface in HPDC process by infrared thermography and comparison with simulation
More Info at Open Access Database www.ndt.net/?id=17680 Thermal behavior study of the mold surface in HPDC process by infrared thermography and comparison with simulation Abstract By S. TAVAKOLI **, *,
More informationModel tests and FE-modelling of dynamic soil-structure interaction
Shock and Vibration 19 (2012) 1061 1069 1061 DOI 10.3233/SAV-2012-0712 IOS Press Model tests and FE-modelling of dynamic soil-structure interaction N. Kodama a, * and K. Komiya b a Waseda Institute for
More informationFRACTURE MECHANICS FOR MEMBRANES
FRACTURE MECHANICS FOR MEMBRANES Chong Li, Rogelio Espinosa and Per Ståhle Solid Mechanics, Malmö University SE 205 06 Malmö, Sweden chong.li@ts.mah.se Abstract During fracture of membranes loading often
More informationSTRAIN ASSESSMENT USFOS
1 STRAIN ASSESSMENT IN USFOS 2 CONTENTS: 1 Introduction...3 2 Revised strain calculation model...3 3 Strain predictions for various characteristic cases...4 3.1 Beam with concentrated load at mid span...
More informationExpansion of circular tubes by rigid tubes as impact energy absorbers: experimental and theoretical investigation
Expansion of circular tubes by rigid tubes as impact energy absorbers: experimental and theoretical investigation M Shakeri, S Salehghaffari and R. Mirzaeifar Department of Mechanical Engineering, Amirkabir
More information1. Introduction. 2. Testing strategy. Daniel HUELSBUSCH 1, Frank WALTHER 1
6th International Symposium on NDT in Aerospace, 12-14th November 2014, Madrid, Spain - www.ndt.net/app.aerondt2014 More Info at Open Access Database www.ndt.net/?id=16947 Damage detection and fatigue
More informationMeasurement of Thermal Diffusivity by Lock-in Thermography
Measurement of Thermal Diffusivity by Lock-in Thermography by P.G. Bison, S. Marinetti, E. Grinzato CNR-ITEF, C.so Stati Uniti 4, 35127 Padova, Italy, E-mail: paolo.bison@itef.pd.cnr.it Abstract Diffusivity
More informationFATIGUE STRENGTH ASSESSMENT OF A SHORT FIBRE-REINFORCED PLASTIC BASED ON THE ENERGY DISSIPATION
16 TH INTERNTIONL CONFERENCE ON COMPOSITE MTERILS FTIGUE STRENGTH SSESSMENT OF SHORT FIBRE-REINFORCED PLSTIC BSED ON THE ENERGY DISSIPTION G. Meneghetti*, M. Quaresimin**, M. De Monte*** *Department of
More informationDistributed: Wednesday, March 17, 2004
MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING CAMBRIDGE, MASSACHUSETTS 019.00 MECHANICS AND MATERIALS II QUIZ I SOLUTIONS Distributed: Wednesday, March 17, 004 This quiz consists
More informationINFLUENCE OF LOADING RATIO ON QUANTIFIED VISIBLE DAMAGES OF R/C STRUCTURAL MEMBERS
Paper N 1458 Registration Code: S-H1463506048 INFLUENCE OF LOADING RATIO ON QUANTIFIED VISIBLE DAMAGES OF R/C STRUCTURAL MEMBERS N. Takahashi (1) (1) Associate Professor, Tohoku University, ntaka@archi.tohoku.ac.jp
More informationAnalysis of Damage of Asphalt Pavement due to Dynamic Load of Heavy Vehicles Caused by Surface Roughness
Analysis of Damage of Asphalt Pavement due to Dynamic Load of Heavy Vehicles Caused by Surface Roughness T. Kanai, K. Tomisawa and T. Endoh Technical Research Institute, Kajima road Co., Ltd., Chofu, Tokyo,
More informationEvaluation of in-plane orthotropic elastic constants of paper and paperboard
Evaluation of in-plane orthotropic elastic constants of paper and paperboard T. Yokoyama and K. Nakai Department of Mechanical Engineering, Okayama University of Science - Ridai-cho, Okayama 7-5, Japan
More informationFatigue calculations in ANSYS Workbench. Martin Eerme
Fatigue calculations in ANSYS Workbench Martin Eerme What is fatigue? In materials science, fatigue is the progressive and localized structural damage that occurs when a material is subjected to cyclic
More informationEnergy balance properties of steels subjected to high cycle fatigue
Author manuscript, published in "SEM 211, United States (211)" Energy balance properties of steels subjected to high cycle fatigue A. Chrysochoos 1, A. Blanche 1, B. Berthel 2, B. Wattrisse 1, (1) LMGC,
More informationTHE USE OF INFRA RED DETECTORS FOR DETERMINATION OF THE FRACTURE MECHANICS PARAMETERS
Journal of Optoelectronics and Advanced Materials Vol., No., December, p. - 9 THE USE OF INFRA RED DETECTORS FOR DETERMINATION OF THE FRACTURE MECHANICS PARAMETERS L. Marsavina *, R. A. Tomlinson a University
More informationCHAPTER 4: BENDING OF BEAMS
(74) CHAPTER 4: BENDING OF BEAMS This chapter will be devoted to the analysis of prismatic members subjected to equal and opposite couples M and M' acting in the same longitudinal plane. Such members are
More informationDetection of Defects in Thermal Barrier Coatings by Thermography Analyses
Materials Transactions, Vol. 44, No. 9 (23) pp. 1845 to 185 #23 The Japan Institute of Metals Detection of Defects in Thermal Barrier Coatings by Thermography Analyses Hua-nan Liu 1, Michiru Sakamoto 1;
More informationFCP Short Course. Ductile and Brittle Fracture. Stephen D. Downing. Mechanical Science and Engineering
FCP Short Course Ductile and Brittle Fracture Stephen D. Downing Mechanical Science and Engineering 001-015 University of Illinois Board of Trustees, All Rights Reserved Agenda Limit theorems Plane Stress
More informationJunya Yazawa 1 Seiya Shimada 2 and Takumi Ito 3 ABSTRACT 1. INTRODUCTION
PREDICTIVE METHOD OF INELASTIC RESPONSE AND RESIDUAL DEFORMATION OF STEEL FRAME USING SEMI-RIGID CONNECTIONS WITH SELF-RETURNING RESTORING FORCE CHARACTERISTICS Junya Yazawa 1 Seiya Shimada 2 and Takumi
More informationIdentification of heat source fields from. infra-red thermography: Determination of. self-heating in a dual-phase steel by using a.
Manuscript Click here to view linked References Author manuscript, published in "Mechanics of Materials 42 (2010) 55-62" DOI : 10.1016/j.mechmat.2009.09.005 Identification of heat source fields from infra-red
More informationA Portable Optical DSPI System for Residual Stresses Measurement by Hole Drilling Using the Integral Method in Terms of Displacement
A Portable Optical DSPI System for Residual Stresses Measurement by Hole Drilling Using the Integral Method in Terms of Displacement Armando Albertazzi G. Jr. 1, a*, Matias Viotti 1, b, Celso Veiga 1,c
More informationModule 5: Failure Criteria of Rock and Rock masses. Contents Hydrostatic compression Deviatoric compression
FAILURE CRITERIA OF ROCK AND ROCK MASSES Contents 5.1 Failure in rocks 5.1.1 Hydrostatic compression 5.1.2 Deviatoric compression 5.1.3 Effect of confining pressure 5.2 Failure modes in rocks 5.3 Complete
More informationLecture #2: Split Hopkinson Bar Systems
Lecture #2: Split Hopkinson Bar Systems by Dirk Mohr ETH Zurich, Department of Mechanical and Process Engineering, Chair of Computational Modeling of Materials in Manufacturing 2015 1 1 1 Uniaxial Compression
More information