FATIGUE MECHANISM OF BOLTED JOINTS UNDER MULTI-AXIAL VIBRATION
|
|
- Holly Floyd
- 5 years ago
- Views:
Transcription
1 Proceedings of the 5th Interntionl Conference on Integrity-Relibility-Filure, Porto/Portugl July 2016 Editors J.F. Silv Gomes nd S.A. Meguid Publ. INEGI/FEUP (2016) PAPER REF: 6299 FATIGUE MECHANISM OF BOLTED JOINTS UNDER MULTI-AXIAL VIBRATION Shinji Hshimur 1(*), Tomotk Tnk 2, Tkefumi Otsu 3 1 Deprtment of Engineering Science nd Mechnics, Shibur Institute of Technology, Tokyo, Jpn 2 Dep. Mechnicl Engineering, Grdute School of Ngok University of Technology, Ngok, Jpn 3 Deprtment of Mechnicl Engineering, Kurume Ntionl College of Technology, Fukuok, Jpn (*) Emil: hsimur@shibur-it.c.jp ABSTRACT Mny bolted joints nd bolt/nut ssemblies re used in vrious fields. However it is lso undenible tht there re mny ccidents cused by bolts filure. Mny ftigue tests of bolted joints which re subjected to xil vibrtion hve been conducted. Ftigue tests of bolted joints which re subjected to trnsverse vibrtion hve been lso conducted in recent yers. However the ctul bolted joints re subjected to complex vibrtion. In this study, ftigue tests of bolted joints which ws simultneously subjected to xil vibrtion nd trnsverse vibrtion were performed to revel ftigue phenomenon of bolted joint subjected to complex vibrtions. In the experiments, the mplitude of xil vibrtion force ws constnt nd the mplitude of trnsverse vibrtion force ws only chnged. The experiments for the bolted joint subjected to only trnsverse vibrtion were lso conducted to compre. The results showed tht the pprent trnsverse ftigue limits, the highest mplitude of trnsverse vibrtion which the bolted joint did not fil due to ftigue, were different ccording to the phse difference of superposition of vibrtions. If the two vibrtions were superposed with the sme phse, the pprent trnsverse ftigue limit decresed becuse principl stress t the first thred root becme the highest. Keywords: Bolted joint, ftigue mechnism, xil vibrtion, trnsverse vibrtion. INTRODUCTION Mny Bolted joints nd threded fsteners re used for ssembling mchines nd structures. But it is lso undenible tht there re mny ccidents cused by bolts filure (Ministry of Lnd, 2013). A lot of reserches bout ftigue of bolted joints hve been investigted so fr. Especilly, ftigue chrcteristics nd mechnisms for the bolted joints subjected to xil vibrtion hd been reveled (Stephens, 2007) (Yoshimoto, 1984) (Ohshi, 1985) (Ohshi, 1994) (Alexnder, 2000). In recent yers, investigtion of ftigue nd self-loosening of bolted joints which re subjected to trnsverse vibrtion hve been lso conducted (Jing, 2003) (Jing, 2002) (Hshimur, 2006) (Hshimur, 2007). In the most cses, ftigue crcks occurs t root of the first thred, which externl threds begin to engge internl threds. A nominl stress t the root of the first thred cn be esily clculted from the xil vibrtion force nd the effective section re if the bolted joint ws subjected to xil vibrtion. A method to clculte nominl stress t the root of the first thred occurred by trnsverse force hd lso been proposed if the bolted joint ws subjected to only trnsverse vibrtion (Hshimur, 2010). However clcultion method of the stress t the root of the first thred of bolted joints, which ws simultneously subjected to xil vibrtion nd trnsverse vibrtion, hve
2 Symposium_17: Mechnicl Connections not been proposed yet. Jing et l. investigted n influence of loding direction on selfloosening of bolted joint (Zhng, 2006). In their experiments, ngles of cyclic lods pplied to the bolted joints were 30 degree, 15 degree nd 0 degree from pure shering direction. The results sid tht the ngle of the cyclic lod from pure shering direction resulted in n increse in self-loosening resistnce. In their experiments, reltive displcement of the two clmped prts ws controlling prmeter, nd xil vibrtion nd trnsverse vibrtion hd not been seprtely controlled. They hve focused not on ftigue but on self-loosening. As mentioned bove, the ftigue investigtions of bolted joints subjected to either xil vibrtion or trnsverse vibrtion hve been performed. However the ctul bolted joints re subjected to xil vibrtion nd trnsverse vibrtion simultneously. Ftigue tests of bolted joint subjected to xil vibrtion nd trnsverse vibrtion hve been conducted in this study to revel the bolt ftigue mechnisms in detil. In the ftigue tests, the mplitude of xil vibrtion force ws constnt nd the mplitude of trnsverse vibrtion force ws only chnged in ech experiment. In the ftigue tests, xil vibrtion nd trnsverse vibrtion were pplied to the bolted joint with the sme phse nd the different phse. The ftigue tests for the bolted joint subjected to only trnsverse vibrtion were lso conducted to compre. The ftigue chrcteristics were evluted with n pprent trnsverse ftigue limit, the highest mplitude of trnsverse vibrtion tht the bolt does not brek due to ftigue. EXPERIMENTAL APPARATUS AND PROCEDURES Figure 1() shows test bolt nd Fig. 1(b) shows tightening sitution of tightened test bolt sitution subjected to trnsverse vibrtion nd xil vibrtion. The test bolt ws commercil hexgon hed bolt M10, thred pitch 1.5mm, nominl length l=45mm, property clss 8.8. The corners of the bering surfce under the bolt hed were mchined to ignore n influence of the scrtch due to corners of the bering surfce during ftigue test. A new test bolt ws used in ech experiment. Fig. 1 - A test bolt nd tightening sitution In the experiments, grip length l g of the bolted joint ws 35 mm nd engging thred length l e ws 10 mm. After the test bolt ws tightened with the initil clmping force F i into the internl thred s shown in Fig. 1(b), xil vibrtion ws pplied to the upper clmped prt nd trnsverse vibrtion ws pplied to the lower clmped prt. Consequently the test bolt received xil vibrtion nd trnsverse vibrtion simultneously
3 Proceedings of the 5th Interntionl Conference on Integrity-Relibility-Filure Figure 2 shows schemtic illustrtion of n experimentl pprtus for the multi-xil ftigue tests. The pprtus ws designed to simulte two-plte structure without nut. The test bolt ws tightened into the internl thred dpter through the upper clmped prt nd lod cell to mesure clmping force F in the center of the pprtus. The upper clmped prt ws supported by bll retiner to move in only xil direction. The contct surfces round the upper clmped prt were hrdened to reduce the friction. Frictionl losses were mesured to be less thn 1% of the xil vibrtion force were neglected in this study. The upper clmped prt ws lso supported by disk spring in xil direction to increse the lod fctor of the bolt. Fig. 2 - An experimentl pprtus The lower clmped prt ws supported by four liner rollers to move in only trnsverse direction. The internl thred dptor ws ttched to the lower clmped prt. Since the contct surfces round the lower clmped prt were hrdened to reduce the friction, frictionl losses round the lower clmped prt were lso were neglected. The displcement of vibrted clmped prt ws mesured by non-contct lser displcement trnsducer. Axil vibrtion ws pplied using n eccentric cm nd severl disk springs. The mplitude of xil vibrtion force ws ( P/2)=2.3 kn constnt nd the stress rtio R ws R=0. The xil vibrtion force P ws mesured by lod cell ttched on the upper clmped prt. Trnsverse vibrtion ws lso pplied using n eccentric cm nd lef springs. The mplitude of trnsverse vibrtion force ws ( Pt/2) controlled chnging number of lef springs. The stress rtio Rt ws Rt=-1. The trnsverse vibrtion force Pt ws mesured by lod cell ttched on the right side of the lower clmped prt. The rottions of the eccentric cms for xil vibrtion nd for trnsverse vibrtion were synchronized by timing belts. If phses between the xil vibrtion nd the trnsverse vibrtion were different, it is considered tht the ftigue chrcteristics might vry depending on the phses. The combintion of the two phses come down to two cses pproximtely s shown in Fig.2(b). The first cse ws sme phse, nd we defined the cse s phse A. The second cse ws phse gp 90 degree, nd we defined
4 Symposium_17: Mechnicl Connections the cse s phse B. Incidentlly, if the phse gp is 180 degree, the phse gp equls to phse A. In this cse, the point, t which the mximum stress generted, chnge to the opposite root of threds. The internl thred dptor plte prt ws mde of chromium-molybdenum steel JIS SCM435 nd mnufctured by tpping. The tp ws inserted into the internl threds to check the deformtion of the internl threds before ech experiment. If n bnormlity of the internl thred were detected, the dptor would be replced with new one. Otherwise, the dptor ws repetedly used in the experiments. The upper clmped prt nd the lower clmped prt were lso mde of chromium-molybdenum steel JIS SCM435 nd hole dimeter D h in the bering surfce prt ws 11mm. The ftigue tests were strted fter the test bolt ws tightened by wrench with F i =15kN nd device to pply the xil vibrtion ws ttched on the upper clmped prt. To revel influences of n interction between two vibrtions on bolted joint ftigue, the ftigue tests were conducted in three conditions. In the first condition, the bolted joints were pplied the two vibrtions with phse A. In the second condition, the bolted joints were pplied the two vibrtions with phse B. The third condition ws the ftigue tests under only trnsverse vibrtion. The mplitude of xil vibrtion force ws fixed with constnt ( P /2)=2.3 kn, nd the mplitude of trnsverse vibrtion force ws chnged from ( P t /2)=0.7 kn to 0.27 kn in ech experiment to revel ftigue limits. The ftigue tests were stopped when the clmping 7 force F reched zero or the loding cycle exceeded 1 10 cycles. In ll ftigue tests, the thred surfce nd bering surfce were lubricted by MoS 2 grese. In this study, we defined the highest mplitude of trnsverse vibrtion tht the bolt does not brek due to ftigue s n pprent trnsverse ftigue limit ( P t /2) w when the bolt received only trnsverse force. When the test bolt received the xil vibrtion in ddition to the trnsverse vibrtion in phse A, the pprent trnsverse ftigue limit ws denoted by ( P t /2) w-a. When the test bolt received the xil vibrtion in ddition to the trnsverse vibrtion in phse B, the pprent trnsverse ftigue limit ws lso denoted by ( P t /2) w-b. The ftigue chrcteristics were evluted by these pprent trnsverse ftigue limits lthough the xil vibrtion ws pplied to the test bolt. RESULTS OF MULTI-AXIAL FATIGUE TESTS Figure 3 shows the results of ftigue tests. The ordinte is the mplitude of trnsverse force ( P t /2), nd bsciss is the number of cycles to filure N f. In Fig. 3, blck circulr symbols indicte the ftigue lives N f of the test bolts subjected to trnsverse vibrtion only. And white circulr symbols show the results tht the test bolts did not brek due to ftigue. The pprent ftigue limit due to trnsverse vibrtion only ws ( P t /2) w =0.43 kn. Blck rhombus symbols indicte the ftigue lives N f of the bolts subjected to xil vibrtion with phse A in ddition to trnsverse vibrtion. And white rhombus symbol shows the results tht the test bolts did not brek. The pprent ftigue limit of phse A ws ( P t /2) w-a =0.27 kn. Blck squre symbols indicte the ftigue lives N f of phse B. A white squre symbol shows the results tht the test bolts did not brek. The pprent ftigue limit of phse B ws ( P t /2) w-b =0.34 kn. It cn be seen in Fig. 3 tht the ftigue limits for ech loding condition were different. As mtter of course, the pprent ftigue limit ( P t /2) w by only trnsverse vibrtion were the highest in ll conditions becuse the bolted joint in phse A nd phse B ws subjected to the xil vibrtion in ddition to the trnsverse vibrtion. The number of cycles to filure N f,
5 Proceedings of the 5th Interntionl Conference on Integrity-Relibility-Filure which the bolted joint ws subjected to the trnsverse vibrtion only, were lso longer thn the other conditions. Frcture crcks occurred t the root of the first thred in most cses. Fig. 3 - Reltionships between mplitude of trnsverse vibrtion force P t /2 nd number of cycles to filure N f. It cn be lso seen tht the pprent ftigue limit ( P t /2) w-b of phse B ws bout 25 % higher thn the pprent ftigue limit ( P t /2) w-a of phse A lthough the sme xil vibrtion ws pplied to the bolted joint. The difference of these conditions ws the phse gp of vibrtions only. The results indicte tht the stresses t the root of the first thred were different in ech loding condition even if the mplitude of xil vibrtion force nd the mplitude of trnsverse vibrtion were the sme. Therefore we hve to understnd reltionships between the stresses t the root of the first thred nd the mplitudes of ech vibrtion force. Incidentlly, the difference between ( P t /2) w nd ( P t /2) w-a ws 0.16 kn lthough the xil vibrtion ws pplied to the bolted joint in ddition to trnsverse vibrtion in the experiments of phse A. The difference between ( P t /2) w nd ( P t /2) w-b ws lso 0.09 kn. These two differences were very smll. It is seen from the results tht trnsverse vibrtion hs gret influence on the bolt ftigue in comprison with xil vibrtion. In our experimentl pprtus, there were liner rollers between clmped prts. Hence it is considered tht the ctul pprent ftigue limits re lrger thn the results in this study becuse the ctul pprent ftigue limits must be included friction force between bering surfces. However the ctul pprent trnsverse ftigue limits re not so strong even if the friction force between clmped prts ws included. Therefore we hve to py enough ttention to trnsverse vibrtion of bolted joints. STRESS AT A ROOT OF THE FIRST THREAD To revel n influence of the phse gp on the ftigue strengths, we mesured the stresses t the root of the first thred pplied by xil vibrtion nd trnsverse vibrtion using strin gges. And then we hve lso proposed method to clculte the stresses t the root of the first thred by xil vibrtion nd trnsverse vibrtion nlyticlly
6 Symposium_17: Mechnicl Connections At first we clculted the reltionship between xil force P nd the stress σ t the root of the first thred. When the bolted joint received xil force P, the dditionl xil force Q of the bolt becomes following eqution. Q =Φ (1) P where Φ is lod fctor of the bolted joint nd expressed by Eq.(2). Φ = Cb C + C b c where C b is spring constnt of the bolt nd C c is spring constnt of the clmped prt. Let S be the lod to the clmped prt due to xil force P, Φ is expressed s Φ = Q P P S = P The nominl stress σ cused by xil force P is expressed by following eqution. P σ = Φ A s P S = A s where A s is n effective section re of the bolt thred portion. In the experimentl pprtus, xil force P ws mesured by the lod cell for xil force nd the lod S to the clmped prt ws mesured by the lod cell for clmping force. As result of preliminry experiments, lod fctor Φ of the pprtus ws Φ=0.68. Next, the reltionship between the trnsverse force nd the stress t the root of the first thred is clculted. Fig. 4 shows schemtic illustrtion of deformed bolt which is subjected to trnsverse vibrtion only. In Fig.4, point O is point under the bolt hed, point A is border point between the shnk nd threded portion. Point B is the first bolt thred which begins to engging the internl thred. When the bolt receives trnsverse force P t, the bolt deforms S-shpe s shown in Fig.4 becuse the engged bolt threds re constrined by the internl threds. At this time, the bolt hed hs n inclintion ϕ o t point O. The thred surfce slips t point B in the trnsverse direction, δ s-slip. The threded portion simultneously inclines t point B, ϕ B, nd the bending moment M B t point B is generted. The right side of Fig.4 shows bending moment digrm of the bolt subjected to trnsverse force P t. The bending moment M on the bolt is expressed by following eqution by bem theory. (2) (3) (4) M ( lg x) M B = P (5) t + Where where l g is grip length of the bolted joint. The bending moment M B is expressed s M B = C P t l g (6) where C is coefficient of the bending moment. If ϕ B =0 nd ϕ o =0, the coefficient C becomes 0.5. However the coefficient C does not become zero becuse ϕ B nd ϕ o re existing ctully. Hence it is not esily to determine the coefficient C becuse C depends on the inclintion ϕ B t point B nd the slippge δ s-slip between thred surfces
7 Proceedings of the 5th Interntionl Conference on Integrity-Relibility-Filure Fig. 4 - A schemtic illustrtion of deformed bolt due to trnsverse force If the coefficient C is known, the reltionship between the trnsverse force P t nd the nominl stress σ t t the root of the first thred cn be expressed s follow. M B d C P l 3 t g d3 σ t = = (7) I 2 I 2 b b where d 3 is the root dimeter of bolt thred nd I b is the moment of inerti of effective section re of the bolt thred. If we could know either the bending moment M B or coefficient C, the nominl stress σ t t the root of the first thred cn be clculted from trnsverse force P t. Then we mesured the bending moment M B t point B using test bolt ttched strin gges. Fig.5 shows test bolt to mesure the bending moment M B nd bending moment digrm. The thred portion, which did not engge with the internl threds, ws removed by lthe. Six strin gges were ttched to the both opposite sides on the bolt shnk s shown in n illustrtion in Fig.5. The outputs of the strin gges were clibrted pplying bending moment to the test bolt in dvnce. A grph in Fig.5 shows bending moment digrm when trnsverse vibrtion ( P t /2) ws pplied to the bolted joint. The bending moment digrms were drwn for three mplitudes of trnsverse vibrtion, ( P t /2)=0.29 kn, ( P t /2)=0.46 kn nd ( P t /2)=0.55 kn. As cn be seen in Fig.5, ll bending moment digrms were liner ginst the bolt position in xil direction. It cn be lso seen in Fig.5 tht the bolt deformed like S-shpe. The bending moment M B t point B ws clculted by extrpoltion. Coefficient C becme C=0.37 substituting M B for Eq.(6). And this coefficient C ws lmost the sme for the ll mplitudes of trnsverse vibrtion. The stress (σ +σ t ) t the root of the first thred due to xil vibrtion P nd trnsverse vibrtion P t were clculted substituting ( P /2) nd ( P t /2) for Eq.(4) nd Eq.(7)
8 Symposium_17: Mechnicl Connections Fig. 5 - A test bolt ttched strin gges nd bending moment digrms of the test bolt Figure 6 shows the mesured stress σn-exp nd the clculted stress (σ+σt)n-cl by Eq.(4) nd Eq.(7) when the test bolt ws subjected to ( Pt/2)=0.46 kn nd ( P/2)=2.3 kn in phse A. The mesured stress σn-exp ws mesured from the output of M1, B1, M2 nd B2 by extrpoltion. In Fig.6, the ordinte is the nominl stress σn t the root of the first thred nd the bsciss is time. The blck wide solid line nd the gry wide solid line show the stress t the left side root of the first thred, T1. The blck thin solid line nd the gry thin solid line show the stress t the right side root of the first thred, T2. The blck lines show the results of n experiment using the test bolt ttched the strin gges. The gry lines show the clculted stress (σ+σt)n-cl. In the bolt sitution of Fig.6, when the bolt pulled with the mximum xil force such s wide rrow, the lower clmped prt received the mximum trnsverse force in left direction. Hence the mplitude of the stress t T1 ws higher thn tht t T2. Fig. 6 - Comprisons of the stresses which were mesured by the strin gges nd the stresses which were clculted using the xil vibrtion nd the trnsverse vibrtion
9 Proceedings of the 5th Interntionl Conference on Integrity-Relibility-Filure It cn be seen in Fig.6 tht the experimentl stress σn-exp nd the clculted stress (σ+σt)ncl were lmost the sme lthough the experimentl stress hd included electricl noise little. Consequently, the vlidity of superposition of the stresses clculted using Eq.(4) nd Eq.(7) were confirmed. The results indicte tht there is lmost no interction between xil vibrtion nd trnsverse vibrtion. Nmely it is considered tht xil vibrtion hs lmost no influence on the slippge between thred surfces occurred by trnsverse vibrtion. In Fig.6, the mplitude of stress σn t S1 determines the ftigue life of the bolt becuse the mplitude of σn t S1 ws lrger thn tht of σn t S2. Bsed on these results, the mximum mplitudes of stress t the root of the first thred were clculted for ech experimentl condition, nd the experimentl results in Fig.3 were re-drwn by the mximum mplitudes of stress t the root of the first thred. Figure 7 shows the experimentl results which were drwn by the mximum mplitudes of stress (σ +σ t ) n-cl t the root of the first thred. In Fig.7, circulr symbols indicte the ftigue chrcteristic of the bolts subjected to trnsverse vibrtion only. Its ftigue limit ws σ tw =97 MP. Rhombus symbols indicte the ftigue chrcteristic of phse A. Its ftigue limit ws (σ t +σ ) w-a =88 MP. Squre symbols indicte the ftigue chrcteristic of phse B. The ftigue limit ws (σ t + σ ) w-b =81 MP. It cn be seen tht the true ftigue limits in Fig.7 re lmost the sme lthough the pprent ftigue limits re different in Fig.3. The finite ftigue lives N f becme lso lmost the sme. The results show tht the true ftigue limits never chnge by the loding conditions lthough the pprent ftigue limits chnge depending on the loding conditions. Fig. 7 - Reltionships between nominl stresses t the root of the first thred nd number of cycles to filure CONCLUSIONS In this study, we conducted the ftigue tests of bolted joints simultneously subjected to xil vibrtion nd trnsverse vibrtion of which phses were controlled. The min conclusions obtined in this study re summrized s follows. 1. The pprent trnsverse ftigue limit, the highest mplitude of trnsverse vibrtion tht the bolt does not brek due to ftigue, chnges depending on phse difference between xil vibrtion nd trnsverse vibrtion
10 Symposium_17: Mechnicl Connections 2. The true ftigue limits do not chnge depending on phse difference between xil vibrtion nd trnsverse vibrtion. 3. The nominl stress t the root of the first thred, which is frcture point, cn clculte by superposition of the stresses due to xil vibrtion nd trnsverse vibrtion. REFERENCES [1]-Ministry of Lnd, Infrstructure nd Trnsport, Press relese report, The number of ccidents tht wheels fllen off by wheel bolt filure in 2010 is 24., (ccessed on 30 November, 2013) (in Jpnese). [2]-Stephens, I., Brdley, J., Horn, J., Arkem, M. nd Grdmn, J., Influence of cold rolling threds before or fter het tretment on the ftigue resistnce of high strength corse thred bolts for multiple prelod conditions, ASTM Specil Technicl Publiction Vol.1487 STP, 2007, Pges [3]-Yoshimoto, I., Mruym, K. nd Ymd, Y., Prediction of Ftigue Strength of Bolt-nut Joints Bsed on Residul Stress, Trnsctions of the Jpn Society of Mechnicl Engineers, Series A, Vol.50, No.452 (1984), pp (in Jpnese). [4]-Ohshi, N., Hgiwr, M., nd Yoshimoto, I., Chrcteristics of Bolted Joint in Plstic Region Tightening Dispersion of Tightening Axil Force nd Sfety ginst Ftigue -, Bull. Jpn. Soc. Precis. Eng., Vol. 51, No. 7, 1985, pp (in Jpnese). [5]-Ohshi, N., Ksno, H., nd Yoshimoto, I., Reserch on Ftigue Testing of Bolts for Qulit y Assurnce, Trnsctions of the Jpn Society of Mechnicl Engineers, Series C, Vol.60, No.576 (1994), pp (in Jpnese). [6]-Alexnder, D.F., Skochko, G.W., Andrews, W.R., Briody, R.S., Ftigue testing of lowlloy steel fsteners subjected to simultneous bending nd xil lods, ASTM Specil Technicl Publiction Issue 1391, 2000, pp [7]-Jing, Y., Zhng, M., Prk, T.-W. nd Lee, C.-H., An Experimentl Investigtion on Self-loosening of Bolted Joints, ASME Pressure Vessel nd Piping Conf., July 20-24, 2003, Clevelmd, OH, PVP-Vol.457, Anlysis of Bolted Joints, PVP , 2003, pp [8]-Jing, Y., Zhng, M., nd Lee, C.-H., A Study of Erly Stge Self-loosening of Bolted Joints, ASME Journl of Mechnicl Design, Vol. 125, 2003, pp [9]-Hshimur, S. nd Drrell F. Socie, A Study of Loosening nd Ftigue of Bolted Joints under Trnsverse Vibrtion,SAE 2005 Trnsctions, Journl of Mterils nd Mnufcturing, Section 5 (2006), pp [10]-Hshimur, S., Influences of Vrious Fctors of Bolt Tightening on Loosening-Ftigue Filure under Trnsverse Vibrtion, SAE 2007 Trnsctions, Journl of Mterils nd Mnufcturing, Section 5, 2007, pp [11]-Hshimur, S. nd Kurkke, Y., A Study to Predict Ftigue Limits of Bolted Joints under Trnsverse Vibrtion, Proceedings of the 2010 SAE World Congress, Detroit, Michign, April 14-16, Technicl Pper No [12]-Zhng, M., Jing, Y., nd Lee, C.-H., An Experimentl Investigtion of the Effects of Clmped Length nd Loding Direction on Self-Loosening of Bolted Joints, Trnsction of ASME, Journl of Pressure vessel Technology, Vol. 128, 2006, pp
ADVANCEMENT OF THE CLOSELY COUPLED PROBES POTENTIAL DROP TECHNIQUE FOR NDE OF SURFACE CRACKS
ADVANCEMENT OF THE CLOSELY COUPLED PROBES POTENTIAL DROP TECHNIQUE FOR NDE OF SURFACE CRACKS F. Tkeo 1 nd M. Sk 1 Hchinohe Ntionl College of Technology, Hchinohe, Jpn; Tohoku University, Sendi, Jpn Abstrct:
More information1 Bending of a beam with a rectangular section
1 Bending of bem with rectngulr section x3 Episseur b M x 2 x x 1 2h M Figure 1 : Geometry of the bem nd pplied lod The bem in figure 1 hs rectngur section (thickness 2h, width b. The pplied lod is pure
More informationEffects of peripheral drilling moment on delamination using special drill bits
journl of mterils processing technology 01 (008 471 476 journl homepge: www.elsevier.com/locte/jmtprotec Effects of peripherl illing moment on delmintion using specil ill bits C.C. Tso,, H. Hocheng b Deprtment
More informationKINEMATICS OF RIGID BODIES
KINEMTICS OF RIGID ODIES Introduction In rigid body kinemtics, e use the reltionships governing the displcement, velocity nd ccelertion, but must lso ccount for the rottionl motion of the body. Description
More informationSimulation of Eclipsing Binary Star Systems. Abstract
Simultion of Eclipsing Binry Str Systems Boris Yim 1, Kenny Chn 1, Rphel Hui 1 Wh Yn College Kowloon Diocesn Boys School Abstrct This report briefly introduces the informtion on eclipsing binry str systems.
More informationMAC-solutions of the nonexistent solutions of mathematical physics
Proceedings of the 4th WSEAS Interntionl Conference on Finite Differences - Finite Elements - Finite Volumes - Boundry Elements MAC-solutions of the nonexistent solutions of mthemticl physics IGO NEYGEBAUE
More informationShear and torsion interaction of hollow core slabs
Competitive nd Sustinble Growth Contrct Nº G6RD-CT--6 Sher nd torsion interction of hollow core slbs HOLCOTORS Technicl Report, Rev. Anlyses of hollow core floors December The content of the present publiction
More informationBME 207 Introduction to Biomechanics Spring 2018
April 6, 28 UNIVERSITY O RHODE ISAND Deprtment of Electricl, Computer nd Biomedicl Engineering BME 27 Introduction to Biomechnics Spring 28 Homework 8 Prolem 14.6 in the textook. In ddition to prts -e,
More informationApplications of Bernoulli s theorem. Lecture - 7
Applictions of Bernoulli s theorem Lecture - 7 Prcticl Applictions of Bernoulli s Theorem The Bernoulli eqution cn be pplied to gret mny situtions not just the pipe flow we hve been considering up to now.
More informationMotion of Electrons in Electric and Magnetic Fields & Measurement of the Charge to Mass Ratio of Electrons
n eperiment of the Electron topic Motion of Electrons in Electric nd Mgnetic Fields & Mesurement of the Chrge to Mss Rtio of Electrons Instructor: 梁生 Office: 7-318 Emil: shling@bjtu.edu.cn Purposes 1.
More informationSolution Manual. for. Fracture Mechanics. C.T. Sun and Z.-H. Jin
Solution Mnul for Frcture Mechnics by C.T. Sun nd Z.-H. Jin Chpter rob.: ) 4 No lod is crried by rt nd rt 4. There is no strin energy stored in them. Constnt Force Boundry Condition The totl strin energy
More informationExperimental Study, Stiffness of Semi-Rigid Beam-to-Column Connections Using Bolts and Angles
nd rd Interntionl Conference on Electricl, Electronics nd Civil Engineering (ICEECE'1) Jnury 4-5, 1 Bli (Indonesi) Experimentl Study, Stiffness of Semi-Rigid -to- s Using Bolts nd Angles Khled M. Amtered
More informationNew Expansion and Infinite Series
Interntionl Mthemticl Forum, Vol. 9, 204, no. 22, 06-073 HIKARI Ltd, www.m-hikri.com http://dx.doi.org/0.2988/imf.204.4502 New Expnsion nd Infinite Series Diyun Zhng College of Computer Nnjing University
More informationModule 1. Energy Methods in Structural Analysis
Module 1 Energy Methods in Structurl Anlysis Lesson 4 Theorem of Lest Work Instructionl Objectives After reding this lesson, the reder will be ble to: 1. Stte nd prove theorem of Lest Work.. Anlyse stticlly
More informationSTRESS INTENSITY FACTORS AND FATIGUE CRACK GROWTH OF IRREGULAR PLANAR CRACKS SUBJECTED TO ARBITRARY MODE I STRESS FIELDS
STRESS INTENSITY FCTORS ND FTIGUE CRCK GROWTH OF IRREGULR PLNR CRCKS SUBJECTED TO RBITRRY MODE I STRESS FIELDS Grzegorz GLINK University of Wterloo Deprtment of Mechnicl nd Mechtronics Engineering Wterloo.
More informationThe momentum of a body of constant mass m moving with velocity u is, by definition, equal to the product of mass and velocity, that is
Newtons Lws 1 Newton s Lws There re three lws which ber Newton s nme nd they re the fundmentls lws upon which the study of dynmics is bsed. The lws re set of sttements tht we believe to be true in most
More informationISSN. on Ansys. School of. of Shanghai. and. for Science. Abstract This paper. shield bracket. excavation begins, the. the tunneling.
; Vol. 8, No. 4; 014 ISSN 1913-1844 E-ISSN 1913-185 Published by Cndin Center of Science nd Eduction Anlysis for EPB Shield Brcket Bsed on Ansys Bojing Du 1, Yjun Yu 1, Pengpeng Ding 1,Weibin Lv 1 & Fei
More informationME311 Machine Design
ME11 Mchine Design Lecture 10: Springs (Chpter 17) W Dornfeld 9Nov018 Firfield University School of Engineering A Free Body Digrm of coil spring (cutting through nywhere on the coil) shows tht there must
More informationLesson 8. Thermomechanical Measurements for Energy Systems (MENR) Measurements for Mechanical Systems and Production (MMER)
Lesson 8 Thermomechnicl Mesurements for Energy Systems (MEN) Mesurements for Mechnicl Systems nd Production (MME) A.Y. 205-6 Zccri (ino ) Del Prete Mesurement of Mechnicl STAIN Strin mesurements re perhps
More informationChapter 5 Bending Moments and Shear Force Diagrams for Beams
Chpter 5 ending Moments nd Sher Force Digrms for ems n ddition to illy loded brs/rods (e.g. truss) nd torsionl shfts, the structurl members my eperience some lods perpendiculr to the is of the bem nd will
More informationENERGY-BASED METHOD FOR GAS TURBINE ENGINE DISK BURST SPEED CALCULATION
28 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES ENERGY-BASED METHOD FOR GAS TURBINE ENGINE DISK BURST SPEED CALCULATION Anton N. Servetnik Centrl Institute of Avition Motors, Moscow, Russi servetnik@cim.ru
More informationMeasuring Electron Work Function in Metal
n experiment of the Electron topic Mesuring Electron Work Function in Metl Instructor: 梁生 Office: 7-318 Emil: shling@bjtu.edu.cn Purposes 1. To understnd the concept of electron work function in metl nd
More informationComparison of the Design of Flexural Reinforced Concrete Elements According to Albanian Normative
ISBN 978-93-84422-22-6 Proceedings of 2015 Interntionl Conference on Innovtions in Civil nd Structurl Engineering (ICICSE'15) Istnbul (Turkey), June 3-4, 2015 pp. 155-163 Comprison of the Design of Flexurl
More informationLABYRINTH SEALS DYNAMIC COEFFICIENTS AND CRITICAL SPEED RESEARCH BASED ON CHILDS MODEL
Abstrct LABYINTH SALS DYNAMIC COFFICINTS AND CITICAL SPD SACH BASD ON CHILDS MODL M Wensheng, Hung Hi, Feng Guoqun AVIC Shenyng Aeroengine eserch Institute, Shenyng, Chin Keywords:lbyrinth sels, dynmics
More informationProgressive failure analysis of compression-loaded composite flat panel with cutout
Interntionl Journl on Theoreticl nd Applied Reserch in Mechnicl Engineering (IJTARME) Progressive filure nlysis of compression-loded composite flt pnel with cutout 1 Guspir S. Mkndr, 2 N.K. Chhpkhne, 3
More informationModule 2. Analysis of Statically Indeterminate Structures by the Matrix Force Method. Version 2 CE IIT, Kharagpur
Module Anlysis of Stticlly Indeterminte Structures by the Mtrix Force Method Version CE IIT, Khrgpur esson 8 The Force Method of Anlysis: Bems Version CE IIT, Khrgpur Instructionl Objectives After reding
More informationStudy on the Calculation of Magnetic Force Based on the Equivalent Magnetic Charge Method
Avilble online t www.sciencedirect.com Physics Procedi 4 () 9 97 Interntionl Conference on Applied Physics nd Industril Engineering Study on the Clcultion of Mgnetic Force Bsed on the Equivlent Mgnetic
More informationDesign Data 1M. Highway Live Loads on Concrete Pipe
Design Dt 1M Highwy Live Lods on Concrete Pipe Foreword Thick, high-strength pvements designed for hevy truck trffic substntilly reduce the pressure trnsmitted through wheel to the subgrde nd consequently,
More informationDesign Against Fatigue Failure 2/3/2015 1
Design Aginst Ftigue Filure /3/015 1 Ftigue is the filure of mechnicl element by the growth of crck within mteril under vrible, repeted, lternting, or fluctuting stresses. Generlly, ftigue crck growth
More informationINTRODUCTION. The three general approaches to the solution of kinetics problems are:
INTRODUCTION According to Newton s lw, prticle will ccelerte when it is subjected to unblnced forces. Kinetics is the study of the reltions between unblnced forces nd the resulting chnges in motion. The
More information19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007 A NON-CONTACT SYSTEM FOR TRANSPORTING OBJECTS USING ULTRASONIC LEVITATION
19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, -7 SEPTEMBER 007 A NON-CONTACT SYSTEM FOR TRANSPORTING OBJECTS USING ULTRASONIC LEVITATION PACS: 3.5.Uv Gudr, Tdeusz 1 ; Perkowski, Dniel ; Opielinski,
More informationPhysics 201 Lab 3: Measurement of Earth s local gravitational field I Data Acquisition and Preliminary Analysis Dr. Timothy C. Black Summer I, 2018
Physics 201 Lb 3: Mesurement of Erth s locl grvittionl field I Dt Acquisition nd Preliminry Anlysis Dr. Timothy C. Blck Summer I, 2018 Theoreticl Discussion Grvity is one of the four known fundmentl forces.
More informationDYNAMIC HARDNESS DURING DIFFERENT PHASES OF INDENTATION. Vytautas Vasauskas Kaunas University of Technology, Lithuania.
DYNAMIC HARDNESS DURING DIFFERENT PHASES OF INDENTATION ytuts susks Kuns University of Technology, Lithuni. Abstrct. The pper reports on the underlying concept for securing the mesuring bsis used in the
More informationMath 1B, lecture 4: Error bounds for numerical methods
Mth B, lecture 4: Error bounds for numericl methods Nthn Pflueger 4 September 0 Introduction The five numericl methods descried in the previous lecture ll operte by the sme principle: they pproximte the
More informationFig. 1. Open-Loop and Closed-Loop Systems with Plant Variations
ME 3600 Control ystems Chrcteristics of Open-Loop nd Closed-Loop ystems Importnt Control ystem Chrcteristics o ensitivity of system response to prmetric vritions cn be reduced o rnsient nd stedy-stte responses
More informationEffect of soil profile modulus distribution on pile head lateral stiffness
Proc. 18 th NZGS Geotechnicl Symposium on Soil-Structure Interction. d. CY Chin, Aucklnd Michel Pender University of Aucklnd, New Zelnd eywords: pile hed stiffness, effect of pile shft size, soil modulus
More informationBEARINGBYPASS LOADING ON BOLTED COMPOSITE JOINTS
NASA TECHNCAL MEMORANDUM 89 153 L BEARNGBYPASS LOADNG ON BOLTED COMPOSTE JONTS [NASA-TM-89153) BEARNG-BYPASS LOADXNG ON ~ ~ n - 2 ~ ~ 3 7 BOLTED COBPQSTE JONTS (NASA) 34 p Avil: NTS HC i3/flp AO? CSCL
More informationIn-Class Problems 2 and 3: Projectile Motion Solutions. In-Class Problem 2: Throwing a Stone Down a Hill
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Deprtment of Physics Physics 8T Fll Term 4 In-Clss Problems nd 3: Projectile Motion Solutions We would like ech group to pply the problem solving strtegy with the
More informationCAPACITORS AND DIELECTRICS
Importnt Definitions nd Units Cpcitnce: CAPACITORS AND DIELECTRICS The property of system of electricl conductors nd insultors which enbles it to store electric chrge when potentil difference exists between
More informationFEM ANALYSIS OF ROGOWSKI COILS COUPLED WITH BAR CONDUCTORS
XIX IMEKO orld Congress Fundmentl nd Applied Metrology September 6 11, 2009, Lisbon, Portugl FEM ANALYSIS OF ROGOSKI COILS COUPLED ITH BAR CONDUCTORS Mirko Mrrcci, Bernrdo Tellini, Crmine Zppcost University
More informationC D o F. 30 o F. Wall String. 53 o. F y A B C D E. m 2. m 1. m a. v Merry-go round. Phy 231 Sp 03 Homework #8 Page 1 of 4
Phy 231 Sp 3 Hoework #8 Pge 1 of 4 8-1) rigid squre object of negligible weight is cted upon by the forces 1 nd 2 shown t the right, which pull on its corners The forces re drwn to scle in ters of the
More information1 Which of the following summarises the change in wave characteristics on going from infra-red to ultraviolet in the electromagnetic spectrum?
Which of the following summrises the chnge in wve chrcteristics on going from infr-red to ultrviolet in the electromgnetic spectrum? frequency speed (in vcuum) decreses decreses decreses remins constnt
More informationBend Forms of Circular Saws and Evaluation of their Mechanical Properties
ISSN 139 13 MATERIALS SCIENCE (MEDŽIAGOTYRA). Vol. 11, No. 1. 5 Bend Forms of Circulr s nd Evlution of their Mechnicl Properties Kristin UKVALBERGIENĖ, Jons VOBOLIS Deprtment of Mechnicl Wood Technology,
More informationKirchhoff and Mindlin Plates
Kirchhoff nd Mindlin Pltes A plte significntly longer in two directions compred with the third, nd it crries lod perpendiculr to tht plne. The theory for pltes cn be regrded s n extension of bem theory,
More informationAvailable online at ScienceDirect. Procedia Engineering 172 (2017 )
Aville online t www.sciencedirect.com ScienceDirect Procedi Engineering 172 (2017 ) 218 225 Modern Building Mterils, Structures nd Techniques, MBMST 2016 Experimentl nd Numericl Anlysis of Direct Sher
More informationSolutions to Supplementary Problems
Solutions to Supplementry Problems Chpter 8 Solution 8.1 Step 1: Clculte the line of ction ( x ) of the totl weight ( W ).67 m W = 5 kn W 1 = 16 kn 3.5 m m W 3 = 144 kn Q 4m Figure 8.10 Tking moments bout
More informationAn inverse steady state thermal stresses in a thin clamped circular plate with internal heat generation
Americn Journl of Engineering Reserch (AJER) e-issn : 2320-0847 p-issn : 2320-0936 Volume-02, Issue-10, pp-276-281 www.jer.org Reserch Pper Open Access An inverse stedy stte therml stresses in thin clmped
More informationKINEMATICS OF RIGID BODIES
KINEMTICS OF RIGI OIES Introduction In rigid body kinemtics, e use the reltionships governing the displcement, velocity nd ccelertion, but must lso ccount for the rottionl motion of the body. escription
More information1. a) Describe the principle characteristics and uses of the following types of PV cell: Single Crystal Silicon Poly Crystal Silicon
2001 1. ) Describe the principle chrcteristics nd uses of the following types of PV cell: Single Crystl Silicon Poly Crystl Silicon Amorphous Silicon CIS/CIGS Gllium Arsenide Multijunction (12 mrks) b)
More information- 5 - TEST 2. This test is on the final sections of this session's syllabus and. should be attempted by all students.
- 5 - TEST 2 This test is on the finl sections of this session's syllbus nd should be ttempted by ll students. Anything written here will not be mrked. - 6 - QUESTION 1 [Mrks 22] A thin non-conducting
More informationNumerical Study Of Coated Electrical Contacts
Excerpt from the Proceedings of the COMSOL Conference 21 Pris Numericl Study Of Coted Electricl Contcts Per Lindholm Mchine Design KTH Brinellvägen 83 SE-144 Stockholm per@md.kth.se Abstrct: Electricl
More informationElectrical Drive 4 th Class
University Of Technology Electricl nd Electronics Deprtment Dr Nofl ohmmed Ther Al Kyt A drive consist of three min prts : prime mover; energy trnsmitting device nd ctul pprtus (lod), hich perform the
More informationpivot F 2 F 3 F 1 AP Physics 1 Practice Exam #3 (2/11/16)
AP Physics 1 Prctice Exm #3 (/11/16) Directions: Ech questions or incomplete sttements below is followed by four suggested nswers or completions. Select one tht is best in ech cse nd n enter pproprite
More informationEntropy ISSN
Entropy 006, 8[], 50-6 50 Entropy ISSN 099-4300 www.mdpi.org/entropy/ ENTROPY GENERATION IN PRESSURE GRADIENT ASSISTED COUETTE FLOW WITH DIFFERENT THERMAL BOUNDARY CONDITIONS Abdul Aziz Deprtment of Mechnicl
More informationForces from Strings Under Tension A string under tension medites force: the mgnitude of the force from section of string is the tension T nd the direc
Physics 170 Summry of Results from Lecture Kinemticl Vribles The position vector ~r(t) cn be resolved into its Crtesin components: ~r(t) =x(t)^i + y(t)^j + z(t)^k. Rtes of Chnge Velocity ~v(t) = d~r(t)=
More informationChapter 5 Weight function method
Chpter 5 Weight function method The weight functions re powerful method in liner elstic frcture mechnics (Anderson, 1995; Td, Pris & rwin, 2). nitilly they were used for clculting the. The underlying hypothesis
More informationDISTRIBUTION OF SUB AND SUPER HARMONIC SOLUTION OF MATHIEU EQUATION WITHIN STABLE ZONES
Fifth ASME Interntionl Conference on Multibody Systems, Nonliner Dynmics nd Control Symposium on Dynmics nd Control of Time-Vrying nd Time-Dely Systems nd Structures September 2-2, 05, Long Bech, Cliforni,
More informationRolling Contact Bearings (pg 599)
Bering V9.xmcd [Pg / 6] Title [234] The Units used s stndrd: m, kg, N, P, sec, wtts N, kg, m, P, sec/min, wtts/kw Rolling Contct Berings (pg 599) This note is only guideline for using the text book. Detiled
More informationUpper bound analysis of equal channel angular extrusion
Downloded from orbit.dtu.dk on: Jun 06, 018 Upper bound nlysis of equl chnnel ngulr extrusion Lptev, Alexnder M.; Perig, Alexnder V.; Kkvs, Pnyiotis A.; Anyfntis, Konstntinos; Erfort, Yuri A. Published
More informationP 3 (x) = f(0) + f (0)x + f (0) 2. x 2 + f (0) . In the problem set, you are asked to show, in general, the n th order term is a n = f (n) (0)
1 Tylor polynomils In Section 3.5, we discussed how to pproximte function f(x) round point in terms of its first derivtive f (x) evluted t, tht is using the liner pproximtion f() + f ()(x ). We clled this
More informationUsing air lines as references for VNA phase measurements
Using ir lines s references for VNA phse mesurements Stephen Protheroe nd Nick Ridler Electromgnetics Tem, Ntionl Physicl Lbortory, UK Emil: Stephen.protheroe@npl.co.uk Abstrct Air lines re often used
More informationThe Initial Post-buckling Behavior of Face-Sheet Delaminations in Sandwich Composites
G. A. Krdomtes Professor, Fellow ASME H. Hung 1 Post-doctorl Fellow School of Aerospce Engineering, Georgi Institute of Technology, Atlnt, GA 0-0150 The Initil Post-buckling Behvior of Fce-Sheet Delmintions
More informationNUMERICAL INTEGRATION. The inverse process to differentiation in calculus is integration. Mathematically, integration is represented by.
NUMERICAL INTEGRATION 1 Introduction The inverse process to differentition in clculus is integrtion. Mthemticlly, integrtion is represented by f(x) dx which stnds for the integrl of the function f(x) with
More informationSTRENGTH AND FATIGUE LIFE OF CARBON/EPOXY LAMINATES UNDER BIAXIAL LOADING
STRENGTH AND FATIGUE LIFE OF CARBON/EPOXY LAMINATES UNDER BIAXIAL LOADING C. S. Lee, W. Hwng, H. C. Prk, nd K. S. Hn Deprtment o Mechnicl Engineering Pohng University o Science nd Technology, Pohng 79-784,
More informationCOMMISSIONING THE NEW PITCH DAMPING RIG AT THE CSIR WIND TUNNEL FACILITIES
3 RD INTERNATIONAL SYMPOSIUM ON BALLISTICS TARRAGONA, SPAIN 6-0 APRIL 007 COMMISSIONING THE NEW PITCH DAMPING RIG AT THE CSIR WIND TUNNEL FACILITIES F. Dionisio, L. Vn Zyl nd A. Stockenström 3 CSIR DPSS,
More information99/105 Comparison of OrcaFlex with standard theoretical results
99/105 Comprison of OrcFlex ith stndrd theoreticl results 1. Introduction A number of stndrd theoreticl results from literture cn be modelled in OrcFlex. Such cses re, by virtue of being theoreticlly solvble,
More informationTHREE-DIMENSIONAL KINEMATICS OF RIGID BODIES
THREE-DIMENSIONAL KINEMATICS OF RIGID BODIES 1. TRANSLATION Figure shows rigid body trnslting in three-dimensionl spce. Any two points in the body, such s A nd B, will move long prllel stright lines if
More informationDynamics: Newton s Laws of Motion
Lecture 7 Chpter 4 Physics I 09.25.2013 Dynmics: Newton s Lws of Motion Solving Problems using Newton s lws Course website: http://fculty.uml.edu/andriy_dnylov/teching/physicsi Lecture Cpture: http://echo360.uml.edu/dnylov2013/physics1fll.html
More informationExam 1 Solutions (1) C, D, A, B (2) C, A, D, B (3) C, B, D, A (4) A, C, D, B (5) D, C, A, B
PHY 249, Fll 216 Exm 1 Solutions nswer 1 is correct for ll problems. 1. Two uniformly chrged spheres, nd B, re plced t lrge distnce from ech other, with their centers on the x xis. The chrge on sphere
More informationFLEXOELECTRIC ACTUATION AND VIBRATION CONTROL OF RING SHELLS
Proceedings of the ASME 5 Interntionl Design Engineering Technicl Conferences & Computers nd Informtion in Engineering Conference IDETEC/CIE 5 August -5, 5, Boston, Msschusetts, USA DETC5-47994 FLEXOELECTRIC
More informationJackson 2.26 Homework Problem Solution Dr. Christopher S. Baird University of Massachusetts Lowell
Jckson 2.26 Homework Problem Solution Dr. Christopher S. Bird University of Msschusetts Lowell PROBLEM: The two-dimensionl region, ρ, φ β, is bounded by conducting surfces t φ =, ρ =, nd φ = β held t zero
More informationELE B7 Power Systems Engineering. Power System Components Modeling
Power Systems Engineering Power System Components Modeling Section III : Trnsformer Model Power Trnsformers- CONSTRUCTION Primry windings, connected to the lternting voltge source; Secondry windings, connected
More informationPHYS Summer Professor Caillault Homework Solutions. Chapter 2
PHYS 1111 - Summer 2007 - Professor Cillult Homework Solutions Chpter 2 5. Picture the Problem: The runner moves long the ovl trck. Strtegy: The distnce is the totl length of trvel, nd the displcement
More informationSupplementary Information for Directional Reflective Surface Formed via Gradient- Impeding Acoustic Meta-surfaces
Supplementry Informtion for Directionl Reflective Surfce Formed vi Grdient- Impeding Acoustic Met-surfces Kyungjun Song 1*, Jedo Kim 2, Hur Shin 1, Jun-Hyuk Kwk 1, Seong-Hyun Lee 3,Tesung Kim 4 1 Deprtment
More informationVorticity. curvature: shear: fluid elements moving in a straight line but at different speeds. t 1 t 2. ATM60, Shu-Hua Chen
Vorticity We hve previously discussed the ngulr velocity s mesure of rottion of body. This is suitble quntity for body tht retins its shpe but fluid cn distort nd we must consider two components to rottion:
More informationThermal Performance of Electrocaloric Refrigeration using Thermal Switches of Fluid Motion and Changing Contact Conductance
Americn Journl of Physics nd Applictions 2016; 4(5): 134-139 http://www.sciencepublishinggroup.com/j/jp doi:.11648/j.jp.20160405.12 ISSN: 2330-4286 (Print); ISSN: 2330-4308 (Online) Therml Performnce of
More informationV. DEMENKO MECHANICS OF MATERIALS LECTURE 6 Plane Bending Deformation. Diagrams of Internal Forces (Continued)
V. DEMENKO MECHNCS OF MTERLS 015 1 LECTURE 6 Plne ending Deformtion. Digrms of nternl Forces (Continued) 1 Construction of ending Moment nd Shering Force Digrms for Two Supported ems n this mode of loding,
More informationSUPPLEMENTARY INFORMATION
DOI:.38/NMAT343 Hybrid Elstic olids Yun Li, Ying Wu, Ping heng, Zho-Qing Zhng* Deprtment of Physics, Hong Kong University of cience nd Technology Cler Wter By, Kowloon, Hong Kong, Chin E-mil: phzzhng@ust.hk
More informationAnalysis for Transverse Sensitivity of the Microaccelerometer
Engineering, 009, 1, 196-00 doi:10.436/eng.009.1303 Published Online November 009 (http://www.scirp.org/journl/eng). Anlsis for Trnsverse ensitivit of the Microccelerometer Abstrct Yu LIU 1,,3, Guocho
More informationCONTRIBUTION TO THE EXTENDED DYNAMIC PLANE SOURCE METHOD
CONTRIBUTION TO THE EXTENDED DYNAMIC PLANE SOURCE METHOD Svetozár Mlinrič Deprtment of Physics, Fculty of Nturl Sciences, Constntine the Philosopher University, Tr. A. Hlinku, SK-949 74 Nitr, Slovki Emil:
More informationFlutter frequency based on bending - torsion coupling theory
Flutter frequency bsed on bending - torsion coupling theory *ZHENG Xin ¹, LIU Yu-Bin¹, CHEN Pu, SHEN Feng 3,ZHANG Sheng-Jun 3,nd FU Xing-Rong ¹ 1 College of Wter Conservncy nd Civil Engineering, Chin Agriculturl
More informationANALYSIS OF MECHANICAL PROPERTIES OF COMPOSITE SANDWICH PANELS WITH FILLERS
ANALYSIS OF MECHANICAL PROPERTIES OF COMPOSITE SANDWICH PANELS WITH FILLERS A. N. Anoshkin *, V. Yu. Zuiko, A.V.Glezmn Perm Ntionl Reserch Polytechnic University, 29, Komsomolski Ave., Perm, 614990, Russi
More informationMaterials 337. Lecture 7. Topics covered Introduction to fracture mechanics The elastic stress field Superposition principle Fracture toughness
Mterils 337 Lecture 7 Topics covered Introduction to frcture mechnics The elstic stress field Superposition principle Frcture toughness Deprtment of Mechnicl Engineering Curtin University of Technology
More information13.4 Work done by Constant Forces
13.4 Work done by Constnt Forces We will begin our discussion of the concept of work by nlyzing the motion of n object in one dimension cted on by constnt forces. Let s consider the following exmple: push
More informationProperties of Integrals, Indefinite Integrals. Goals: Definition of the Definite Integral Integral Calculations using Antiderivatives
Block #6: Properties of Integrls, Indefinite Integrls Gols: Definition of the Definite Integrl Integrl Clcultions using Antiderivtives Properties of Integrls The Indefinite Integrl 1 Riemnn Sums - 1 Riemnn
More information25 Which of the following summarises the change in wave characteristics on going from infra-red to ultraviolet in the electromagnetic spectrum?
PhysicsndMthsTutor.com 25 Which of the following summrises the chnge in wve chrcteristics on going from infr-red to ultrviolet in the electromgnetic spectrum? 972//M/J/2 frequency speed (in vcuum) decreses
More informationPhysics Honors. Final Exam Review Free Response Problems
Physics Honors inl Exm Review ree Response Problems m t m h 1. A 40 kg mss is pulled cross frictionless tble by string which goes over the pulley nd is connected to 20 kg mss.. Drw free body digrm, indicting
More informationOn the Uncertainty of Sensors Based on Magnetic Effects. E. Hristoforou, E. Kayafas, A. Ktena, DM Kepaptsoglou
On the Uncertinty of Sensors Bsed on Mgnetic Effects E. ristoforou, E. Kyfs, A. Kten, DM Kepptsoglou Ntionl Technicl University of Athens, Zogrfou Cmpus, Athens 1578, Greece Tel: +3177178, Fx: +3177119,
More information16 Newton s Laws #3: Components, Friction, Ramps, Pulleys, and Strings
Chpter 16 Newton s Lws #3: Components, riction, Rmps, Pulleys, nd Strings 16 Newton s Lws #3: Components, riction, Rmps, Pulleys, nd Strings When, in the cse of tilted coordinte system, you brek up the
More informationThermal Diffusivity. Paul Hughes. Department of Physics and Astronomy The University of Manchester Manchester M13 9PL. Second Year Laboratory Report
Therml iffusivity Pul Hughes eprtment of Physics nd Astronomy The University of nchester nchester 3 9PL Second Yer Lbortory Report Nov 4 Abstrct We investigted the therml diffusivity of cylindricl block
More informationPrediction of tool-chip contact length using a new slip-line solution for orthogonal cutting
Interntionl Journl of Mchine Tools & Mnufcture 43 (2003) 1209 1215 Prediction of tool-chip contct length using new slip-line solution for orthogonl cutting Andrey Toropov, Sung-im Ko School of Mechnicl
More informationCE 160 Lab 2 Notes: Shear and Moment Diagrams for Beams
E 160 Lb 2 Notes: Sher nd oment Digrms for ems Sher nd moment digrms re plots of how the internl bending moment nd sher vry long the length of the bem. Sign onvention for nd onsider the rbitrrily loded
More informationCOUPLING OF DAMAGE MECHANICS AND PROBABILISTIC APPROACH FOR LIFE-TIME PREDICTION OF COMPOSITE STRUCTURES
ORAL/POSTER REFERENCE : COUPLING OF DAMAGE MECHANICS AND PROBABILISTIC APPROACH FOR LIFE-TIME PREDICTION OF COMPOSITE STRUCTURES Y. Bruner, J. Renrd, D. Jeulin nd A. Thionnet Centre des Mtériux Pierre-Mrie
More informationMinimum Energy State of Plasmas with an Internal Transport Barrier
Minimum Energy Stte of Plsms with n Internl Trnsport Brrier T. Tmno ), I. Ktnum ), Y. Skmoto ) ) Formerly, Plsm Reserch Center, University of Tsukub, Tsukub, Ibrki, Jpn ) Plsm Reserch Center, University
More informationDesigning Information Devices and Systems I Spring 2018 Homework 7
EECS 16A Designing Informtion Devices nd Systems I Spring 2018 omework 7 This homework is due Mrch 12, 2018, t 23:59. Self-grdes re due Mrch 15, 2018, t 23:59. Sumission Formt Your homework sumission should
More information#6A&B Magnetic Field Mapping
#6A& Mgnetic Field Mpping Gol y performing this lb experiment, you will: 1. use mgnetic field mesurement technique bsed on Frdy s Lw (see the previous experiment),. study the mgnetic fields generted by
More informationChapter 4: Techniques of Circuit Analysis. Chapter 4: Techniques of Circuit Analysis
Chpter 4: Techniques of Circuit Anlysis Terminology Node-Voltge Method Introduction Dependent Sources Specil Cses Mesh-Current Method Introduction Dependent Sources Specil Cses Comprison of Methods Source
More informationA finite thin circular beam element for out-of-plane vibration analysis of curved beams
Journl of Mechnicl Science nd echnology (009) 196~1405 Journl of Mechnicl Science nd echnology www.springerlink.com/content/178-494x DOI 10.1007/s106-008-11- A finite thin circulr bem element for out-of-plne
More informationStatically indeterminate examples - axial loaded members, rod in torsion, members in bending
Elsticity nd Plsticity Stticlly indeterminte exmples - xil loded memers, rod in torsion, memers in ending Deprtment of Structurl Mechnics Fculty of Civil Engineering, VSB - Technicl University Ostrv 1
More informationTwo main standard flows in rheology:
CM4655 Polymer Rheology Lb Elongtionl Flow Mesurement Prof. Fith A. Morrison Michign Technologicl University x 3 x 1, x 1 Two min stndrd flows in rheology: Sher Flow Elongtionl Flow cpillry flow; torsionl
More information