A CRITERION OF TENSILE FAILURE FOR HYPERELASTIC MATERIALS AND ITS APPLICATION TO VISCOELASTIC-VISCOPLASTIC MATERIALS

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "A CRITERION OF TENSILE FAILURE FOR HYPERELASTIC MATERIALS AND ITS APPLICATION TO VISCOELASTIC-VISCOPLASTIC MATERIALS"

Transcription

1 MTS ADHESIVES PROGRAMME PERFORMANCE OF ADHESIVE JOINTS Project: PAJ1; Failure Criteria and their Application to Visco-Elastic/Visco-Plastic Materials Report 2 A CRITERION OF TENSILE FAILURE FOR HYPERELASTIC MATERIALS AND ITS APPLICATION TO VISCOELASTIC-VISCOPLASTIC MATERIALS A OLUSANYA This report represents part of the deliverable for Task 4, Milestone M15 and Task 5, Milestone M19 April 1997

2 A CRITERION OF TENSILE FAILURE FOR HYPERELASTIC MATERIALS AND ITS APPLICATION TO VISCOELASTIC- VISCOPLASTIC MATERIALS A Olusanya Centre for Materials Measurement & Technology National Physical Laboratory Teddington Middlesex TW11 0LW, UK ABSTRACT Uniaxial tensile tests have been used to investigate the mechanical properties of rubber materials. From the results of these studies it was found that the strength of these materials was related to the energy dissipated by the material during deformation, the hysteresis energy, H B. It has been shown for several rubbers that a simple empirical relationship exists between the energy density to break, U B, and the hysteresis energy at break, H B, where K is a constant of proportionality. 2 /3 U B = KH B (1) This relationship indicates that the more energy a rubber can dissipate on deformation, the more work it can withstand before breaking. This relationship has been investigated as to its applicability to flexible rubbery materials, particularly those used as adhesives. Samples of a commercial flexible polyurethane adhesive, 3M DP609, were extended at a constant extension rate to rupture. A fresh sample was then extended under the same conditions to a load just before rupture. The sample was then retracted at the same rate as the extension cycle. The energy at break, U B, was determined by measuring the area under the load-extension curve and the hysteresis energy at break, H B, from the area between the extension and retraction curves. The initial results indicate that this failure criterion describes the failure in this material between two limits: 1 temperatures above the glass transition temperature where the material tends towards hyperelastic behaviour, and 2 higher temperatures where the hysteresis energy, H B tends to zero, i.e. H B approaches the equilibrium modulus. 2 [L93:CMMTB130]

3 Crown copyright 1997 Reproduced by permission of the Controller of HMSO ISSN National Physical Laboratory Teddington, Middlesex TW11 0LW, UK No extracts from this report may be reproduced without the prior written consent of the Managing Director National Physical Laboratory; the source must be acknowledged. Approved on behalf of Managing Director, NPL, by Dr C Lea Head, Centre for Materials Measurement and Technology 3

4 CONTENTS Abstract Introduction Materials Experimental Results And Discussion The Use Of Energy Density, U b, And Hysteresis Energy, H b, As A Criterion Of Failure Dependence Of The Energy To Break, U b On Temperature Comparison Of Adhesive Data With Rubber Materials Conclusions Further Work References List Of Figures [L93:CMMTB130]

5 1 INTRODUCTION Tensile tests have been widely used to study the mechanical properties of rubber materials by a number of workers (1,2,3,4,5). From the results of these investigations, there have been attempts to establish a criterion of failure. These studies have led to the concept of a 'failure envelope' a unique curve, specific to each rubber that gives the bounds of its safe working limit. These failure envelopes relate the stress at break, (σ b ) to the strain at break, (ε b ), over a wide range of temperature and rate of strain. From these results, Smith (1, 2, 3) concluded that: i) Because the internal viscosity of the polymer varies with temperature, the ultimate properties vary and ii) As the ultimate properties vary with strain rate, as the viscous resistance to network deformation increases with rate. Halpin and Bueche (5) showed that the increase in strength of reinforced rubbers is directly related to the increase in their modulus and that the time and temperature dependence of the ultimate properties is directly related to the time temperature dependence of the modulus. As the failure of reinforced rubber is by tearing or crack propagation within the visco-elastic body, they predicted failure and the time to failure curves from the time dependent mechanical properties of the rubber matrix. However these failure envelopes however do not explain the reasons why a material fails under test. One factor that is known to affect the strength of elastic materials is the energy dissipated by the material during deformation, the hysteresis energy. This hysteresis energy represents the amount of recoverable work that the rubber can dissipate without failure. It has been shown for several rubbers (6, 7) that a simple empirical relationship exists between the energy density to break, U B and the hysteresis energy at break, H B, (the maximum recoverable energy), where K is a constant of proportionality, equation 1. 2 /3 U B = KH B (1) This expression indicates that the more energy a rubber can dissipate on deformation, the more energy it can withstand before failing. The applicability of this equation to filled rubber materials has been investigated (7) dependence of U B, the energy density at break, with temperature has been established (7,8). and the There is a body of information for criteria describing failure in stiff brittle adhesives, such as epoxies (9) that are used in structural applications, however there is a dearth of information with regards to criteria applicable to the flexible rubber type of adhesives. These materials are used in great volumes in the packaging, footwear and automotive sectors. This study examines the applicability of this hysteresis energy failure criterion for rubber materials to describe failure in flexible rubber type adhesives. 5

6 2 MATERIALS The applicability of energy as a failure criterion, Equation 1, was investigated for an elastic polyurethane adhesive. 3M DP609, a two-part polyurethane adhesive (also sold as 3M 3532), was cast as large plates, 200 mm x 250 mm x 1 mm. The material was cured at ambient temperature for 12 hours. The cured material was characterised by measurement of the glass transition temperature, Tg, by dynamic mechanical thermal analysis, DMTA. Only adhesive samples where the Tg was 23 o C ± 5 o C were used for testing. Type B ISO 527-2:1993(E) tensile test specimens as shown in Figure 1 with dimensions as given in Table 1 were then pressed from the selected plates. Figure 1. Type B ISO 527-2:1993(E) tensile test specimen Symbol Description Tensile test specimen dimensions (mm) B (1:2) l 3 Minimum overall length 75 b 2 Width at ends 10 ± 0.5 l 1 Length of narrow parallel portion 30 ± 0.5 b 1 Width of narrow parallel portion 5 ± 0.2 R Minimum radius 30 l 0 Distance between gauge marks 25 ± 0.5 L Initial distance between grips 58 ± 2 h Minimum thickness 2 Table 1: Type B ISO 527-2:1993(E) tensile test specimen dimensions 6 [L93:CMMTB130]

7 3 EXPERIMENTAL The mechanical tests were carried out on an Instron 4505 tensile test machine at an extension rate of 4 mm per minute. The hysteresis and failure stress-strain data were obtained at seven nominal test temperatures; 0, 6, 16, 23, 30, 40, 50 o C. The mean value of the breaking stress and strain was obtained from three tensile tests at each temperature. A fresh test sample was then extended to within 5% of the expected breaking stress as calculated from the failure tests and then retracted to zero stress at the same rate to obtain the hysteresis stress-strain curve. This sample was then reextended to ultimate failure. If the failure stress after a hysteresis cycle exceeded the maximum stress from the failure tests by more than 10%, the hysteresis test was discarded and the test was repeated using a fresh sample. The residual strain in the material after a hysteresis test caused a change in the sample gauge length. This necessitated the normalisation of the strain data to account for the automatic resetting of the gauge length by the Instron software. This was achieved by multiplying the failure strain data following a hysteresis cycle by the factor, (1+ the residual strain value). The energy density on extension to failure, U B, was obtained by measuring the area under the load-extension, stress-strain curve. The hysteresis energy, H B, was obtained by measuring the area bounded by the extension-retraction curves. U B *, the energy density on extension to failure after hysteresis is determined from measuring the area under the load-extension, stress-strain curve after a hysteresis cycle. The graphical plotting package Origin by Microcal was used to calculate the areas representing H B, U B and U B *. 4 RESULTS AND DISCUSSION 4.1 THE USE OF ENERGY DENSITY U B, AND HYSTERESIS ENERGY TO BREAK, H B, AS A CRITERION OF FAILURE Figures 2 and 3 show the engineering stresses and strains to failure at the test temperatures for 3M DP609. The area under these failure curves represents U B, the energy density to break. Figures 4 and 5 show the hysteresis curves and the subsequent stresses and strains to failure at each test temperature. Table 2 summarises the average failure energy density, U B, the failure energy density after an extension cycle, U * B and the average hysteresis energy, H B data at the seven test temperatures from Figures 2 to 5. Temperature ( o C) Maximum energy density U B (MJ/m 3 ) Energy density, after extension U B * (MJ/m 3 ) Hysteresis energy H B (MJ/m 3 )

8 Table 2:Energy density and hysteresis energy for 3M DP609 at seven temperatures A range of test temperatures, above and below the measured Tg of the material were selected in order to test the limits of applicability of the failure criterion. As can be seen from the stress strain curves, Figures 2a, 2b, 2c, the strain to failure data clearly show a element of plastic yield behaviour, the magnitude of which is dependent upon the test temperature. The strain to failure data measured after a single hysteresis cycle, Figures 4a, 4b, 4c and 5a also indicate a large element of nonrecoverable deformation. In practice it was found that the failure energy after a single hysteresis cycle, U B * was less than the failure energy of a fresh sample, U B. This is probably due to the work done on the sample causing microcracks or voids which then initiate failure on subsequent testing. Evaluation of the limited amount of data obtained to date, the correlation of the data with the failure equation is reasonable, as use of the failure energy densities, U B, is effectively proposing the maximum case as U B *, the failure energy density after a hysteresis cycle is less than U B. Figure 6 shows a linear regression plot of the logarithm of the energy density, U B, against the logarithm of hysteresis energy. Table 3 gives the parameters of the linear regression, of a logarithmic plot of U B vs H B. Table 3:Coefficients of failure equation for 3M DP609 polyurethane adhesive ln K Correlation coefficient ± [L93:CMMTB130]

9 Figure 2. 3M DP609 Polyurethane adhesive tested to failure at 4 mm/min at 0, 6, 16 and 23 C 9

10 Figure 3. 3M DP609 Polyurethane adhesive tested to failure at 4 mm/min at 30, 40 and 50 o C. 10 [L93:CMMTB130]

11 Figure 4. 3M DP609 Polyurethane adhesive hysteresis and subsequent failure graphs after testing at 4 mm/min at 6, 16 and 23 o C. 11

12 Figure 5.3M DP609 Polyurethane adhesive hysteresis and subsequent failure graphs after testing at 4 mm/min at 30, 40 and 50 o C. 12 [L93:CMMTB130]

13 Figure 6 Log (Energy density), U B, as a function of Log (hysteresis energy), H B. 4.2 DEPENDENCE OF THE ENERGY TO BREAK, U B ON TEMPERATURE The general expression for defining the temperature dependence of the energy to break, U B, with temperature is given by Equation 2 (7) : ln U B = ln k + C T (2) Figure 7 shows the result of plotting the data in using Equation 2. A regression analysis of the data above the glass transition temperature gives a reasonable correlation to Equation 2. The failure mechanism/s at temperatures near or below the glass transition temperature are complex and may be evaluated by use of criteria proposed for stiff adhesive materials (9). It must be repeated that this is only a preliminary study of this relationship, additional data and repeat testing sufficient to fully evaluate this failure criterion for flexible adhesives is to be performed. 13

14 5 COMPARISON OF ADHESIVE DATA WITH RUBBER MATERIALS Harwood and Payne (7) observed that a maxima occurred in the failure energy density, U B at or near the glass transition temperature of the rubber, U B(max). Table 4 compares the maximum energy density, U B(max) at the glass transition temperature for 3M DP609 polyurethane adhesive with the data obtained by Harwood and Payne (7) for four unfilled rubbers. Material U B(max ) (joules/cm -3 ) T g ( o C) 3M DP609 polyurethane adhesive Styrene-butadiene rubber Acrylonitrile-butadiene rubber Butyl rubber Isomerised natural rubber Table 4:Maximum energy density to break, U B(max) and Tg Table 4 shows that the maximum energy density to break of the polyurethane adhesive is only 25% of the value of a styrene-butadiene rubber and significantly lower than any of the other materials. This lower maximum energy density to break of the polyurethane adhesive is probably due to two effects; 1) a lower chain length than the highly extensible rubbers and 2) the influence of the filler materials on the 3M adhesive. The inextensibility of the filler particles is believed to decrease the energy density to break, U B. Figure 7. Effect of temperature on energy to break U B. 14 [L93:CMMTB130]

15 A factor to explain the effect of filler particles on the strain in rubbers has been used (10). This factor relates the volume concentration of filler particles to the effective increase in modulus in the rubber phase, due to the inextensibility of the filler particles, Equation 3. X = σ E ε 0 E 2 = = c c (3) E 0 where: ε is the strain produced by the stress, σ E 0 is the modulus of the rubber without filler E is the modulus and c is the volume concentration of the filler. A similar expression relating the effect of filler particles to the shear viscosity has also been used (11), Equation 4. η 2 3 = η ( c c c ) 0 (4) where η 0 is the viscosity of the rubber without filler c is the volume concentration of the filler The data reported in the literature use filled rubber materials prepared by addition of a known volume of filler material to a base gum rubber, thus it was simple to define the change in ultimate properties with filler concentration. In this study of this failure criterion, commercial adhesives are being used therefore information on filler concentrations will be required from adhesive manufacturers. One adhesive manufacturer has indicated that this information may be supplied. Testing of an unfilled based material is also required, but if data is available for a material with range of filler concentrations, an estimation the material properties for the unfilled base material may be obtained. 6 CONCLUSIONS A simple empirical relationship exists between the energy to break, U B and the hysteresis energy at break, H B derived from uniaxial tensile tests to failure for rubber materials. This relationship has been investigated using a commercial flexible polyurethane adhesive, 3M DP609. The initial results, Figure 7, indicate that this failure criterion may describe failure in this material between two limits: 1 at temperatures above the glass transition temperature where the material tends towards hyperelastic behaviour, and 2 at higher temperatures where the hysteresis energy, H B tends to zero, H B approaches the equilibrium modulus. 15

16 7 FURTHER WORK This initial study of an energy density failure criterion has yielded promising results. The proposed work programme includes testing bulk specimens of a butadiene/epoxy, a filled butadiene, a rubber toughened epoxy as well as further tests on 3M DP609 polyurethane adhesive to establish the applicability of this criterion for a range of adhesives. Finite element analysis is to be used in this programme of work to model the response of adhesive joints under load. This analysis requires the input of data from additional load configurations, i.e. equibiaxial, shear, as well as uniaxial loading to allow the modelling of the material using a finite element package. The stress-strain data from these additional load cases will also be tested against this energy density failure criterion. This hysteresis, H B /failure energy density, U B, failure criterion in practice represents failure upon the instantaneous application of a critical load. Realistically adhesive joints can sustain loads in excess of the theoretical maximum. It is obvious that other mechanisms are in operation which effectively spread this instantaneously applied critical load across the adhesive joint. This transfer of 'excess' load across joints occurs by creep and stress relaxation mechanisms. This slower time dependent behaviour of adhesives is to be investigated in creep tests to failure. The data from these tests will be used in the finite element modelling of the mechanisms by which adhesive joints can sustain loads greater than the expected failure load. The total energy dissipated in creep to failure tests will also be tested against this proposed failure criterion. The work of Smith (1,3) indicates that if time-temperature superposition is applicable the ultimate tensile properties can be characterised by a failure envelope that is independent of time or strain rate, and temperature. The use of time-temperature superposition will allow the correlation of data from different materials which normally correspond to different relative positions on the characteristic failure envelopes. 16 [L93:CMMTB130]

17 8 REFERENCES 1. Smith, T.L. J. Polymer Sci. A, 1, 3597 (1963). 2. Smith, T.L. J. Appl. Phys., 35, 27 (1964). 3. Smith, T.L., Frederick, J.E. J. Appl, Phys., 36, 2996 (1965). 4. Halpin, J.C. J. Appl. Phys., 35, 3133 (1964). 5. Halpin, J.C., Bueche, F. J. Appl. Phys., 35, 3142 (1964). 6. Grosch, K., Harwood, J.A.C., Payne, A.R. Nature, 212, 497 (1966). 7. Harwood, J.A.C., Payne, A.R. J. Appl. Polymer Sci, 12, 889 (1968). 8. Whittaker, R.E. Polymer 13, 169 (1972). 9. Kinloch, A.J. Review of Adhesive Bond Failure Criteria, MTS Programme , Tests and Measurement Methods on the Performance of Adhesive Joints, Project 2: Failure Modes and Criteria, Report 1, August 1994, AEA-ESD Payne, A.R., Whittaker, R.E. J. Appl. Polymer Sci. 15, 1941 (1971). 11. Mullins, L., Tobin, N.R. J. Appl. Polymer Sci. 9, 2993 (1965). 9 LIST OF FIGURES Figure 1 Figure 2 Type B ISO 527-2:1993(E) tensile test specimen 3M DP609 polyurethane adhesive tested to failure at 4 mm/min at 0, 6, 16 and 23 o C. Figure 3 3M DP609 polyurethane adhesive tested to failure at 4 mm/min at 30, 40 and 50 o C. Figure 4 Figure 5 3M DP609 polyurethane adhesive hysteresis and subsequent failure graphs after testing at 4 mm/min at 6, 16 and 23 o C. 3M DP609 polyurethane adhesive hysteresis and subsequent failure graphs after testing at 4 mm/min at 30, 40 and 50 o C. Figure 6 Energy density, U B, as a function of hysteresis energy, H B. Figure 7 Effect of temperature on energy to break, U B. 17

Strength of Adhesive Joints: A Parametric Study

Strength of Adhesive Joints: A Parametric Study Project PAJex1 - Report 3 Strength of Adhesive Joints: A Parametric Study W R Broughton, L E Crocker and J M Urquhart July 2001 NPL Materials Centre National Physical Laboratory NPL Report MATC(A)27 July

More information

Chapter 7. Highlights:

Chapter 7. Highlights: Chapter 7 Highlights: 1. Understand the basic concepts of engineering stress and strain, yield strength, tensile strength, Young's(elastic) modulus, ductility, toughness, resilience, true stress and true

More information

Laboratory 4 Bending Test of Materials

Laboratory 4 Bending Test of Materials Department of Materials and Metallurgical Engineering Bangladesh University of Engineering Technology, Dhaka MME 222 Materials Testing Sessional.50 Credits Laboratory 4 Bending Test of Materials. Objective

More information

Introduction to Engineering Materials ENGR2000. Dr. Coates

Introduction to Engineering Materials ENGR2000. Dr. Coates Introduction to Engineering Materials ENGR2 Chapter 6: Mechanical Properties of Metals Dr. Coates 6.2 Concepts of Stress and Strain tension compression shear torsion Tension Tests The specimen is deformed

More information

BIAXIAL STRENGTH INVESTIGATION OF CFRP COMPOSITE LAMINATES BY USING CRUCIFORM SPECIMENS

BIAXIAL 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 information

Multiscale modeling of failure in ABS materials

Multiscale modeling of failure in ABS materials Institute of Mechanics Multiscale modeling of failure in ABS materials Martin Helbig, Thomas Seelig 15. International Conference on Deformation, Yield and Fracture of Polymers Kerkrade, April 2012 Institute

More information

Understanding Frequency Domain Viscoelasticity in Abaqus

Understanding Frequency Domain Viscoelasticity in Abaqus Paper # 12 Understanding Frequency Domain Viscoelasticity in Abaqus By Saurabh Bahuguna, Randy Marlow*, and Tod Dalrymple Dassault Systèmes Simulia Corp., Great Lakes Region Presented at the Fall 172 nd

More information

Delamination in fractured laminated glass

Delamination in fractured laminated glass Delamination in fractured laminated glass Caroline BUTCHART*, Mauro OVEREND a * Department of Engineering, University of Cambridge Trumpington Street, Cambridge, CB2 1PZ, UK cvb25@cam.ac.uk a Department

More information

Physical Properties Testing Technical Bulletin

Physical Properties Testing Technical Bulletin Technical Bulletin MANUFACTURER Raven Lining Systems 13105 E. 61 st Street, Suite A Broken Arrow, OK 74012 (918) 615-0020 TENSILE TESTING OF PLASTICS ASTM D638, ISO 527 Tensile tests measure the force

More information

VALIDATION of CoDA SOFTWARE for COMPOSITES SYNTHESIS AND PRELIMINARY DESIGN (or GETTING COMPOSITES USED - PART 2 )

VALIDATION of CoDA SOFTWARE for COMPOSITES SYNTHESIS AND PRELIMINARY DESIGN (or GETTING COMPOSITES USED - PART 2 ) VALIDATION of CoDA SOFTWARE for COMPOSITES SYNTHESIS AND PRELIMINARY DESIGN (or GETTING COMPOSITES USED - PART 2 ) Graham D Sims and William R Broughton Composites Design Data and Methods, Centre for Materials

More information

OPTIMISING THE MECHANICAL CHARACTERISATION OF A RESILIENT INTERLAYER FOR THE USE IN TIMBER CON- STRUCTION

OPTIMISING THE MECHANICAL CHARACTERISATION OF A RESILIENT INTERLAYER FOR THE USE IN TIMBER CON- STRUCTION OPTIMISING THE MECHANICAL CHARACTERISATION OF A RESILIENT INTERLAYER FOR THE USE IN TIMBER CON- STRUCTION Luca Barbaresi, Federica Morandi, Juri Belcari, Andrea Zucchelli and Alice Speranza University

More information

Polymer engineering syllabus (BSc)

Polymer engineering syllabus (BSc) Polymer engineering syllabus (BSc) First semester Math 1 Physics 1 Physics 1 lab General chemistry General chemistry lab workshop Second semester Math 2 Physics 2 Organic chemistry 1 Organic chemistry

More information

Elements of Polymer Structure and Viscoelasticity. David M. Parks Mechanics and Materials II February 18, 2004

Elements of Polymer Structure and Viscoelasticity. David M. Parks Mechanics and Materials II February 18, 2004 Elements of Polymer Structure and Viscoelasticity David M. Parks Mechanics and Materials II 2.002 February 18, 2004 Outline Elements of polymer structure Linear vs. branched; Vinyl polymers and substitutions

More information

Outline. Tensile-Test Specimen and Machine. Stress-Strain Curve. Review of Mechanical Properties. Mechanical Behaviour

Outline. Tensile-Test Specimen and Machine. Stress-Strain Curve. Review of Mechanical Properties. Mechanical Behaviour Tensile-Test Specimen and Machine Review of Mechanical Properties Outline Tensile test True stress - true strain (flow curve) mechanical properties: - Resilience - Ductility - Toughness - Hardness A standard

More information

Mechanical properties 1 Elastic behaviour of materials

Mechanical properties 1 Elastic behaviour of materials MME131: Lecture 13 Mechanical properties 1 Elastic behaviour of materials A. K. M. B. Rashid Professor, Department of MME BUET, Dhaka Today s Topics Deformation of material under the action of a mechanical

More information

CHEM-C2410: Materials Science from Microstructures to Properties Composites: basic principles

CHEM-C2410: Materials Science from Microstructures to Properties Composites: basic principles CHEM-C2410: Materials Science from Microstructures to Properties Composites: basic principles Mark Hughes 14 th March 2017 Today s learning outcomes To understand the role of reinforcement, matrix and

More information

Dynamic Mechanical Analysis of Solid Polymers and Polymer Melts

Dynamic Mechanical Analysis of Solid Polymers and Polymer Melts Polymer Physics 2015 Matilda Larsson Dynamic Mechanical Analysis of Solid Polymers and Polymer Melts Polymer & Materials Chemistry Introduction Two common instruments for dynamic mechanical thermal analysis

More information

NE 125 L. Title Page

NE 125 L. Title Page NE 125 L Title Page Name: Rajesh Swaminathan ID Number: 20194189 Partners Names: Clayton Szata 20193839 Sarvesh Varma 20203153 Experiment Number: 1 Experiment: Date Experiment was Started: Date Experiment

More information

A PROTOCOL FOR DETERMINATION OF THE ADHESIVE FRACTURE TOUGHNESS OF FLEXIBLE LAMINATES BY PEEL TESTING: FIXED ARM AND T-PEEL METHODS

A PROTOCOL FOR DETERMINATION OF THE ADHESIVE FRACTURE TOUGHNESS OF FLEXIBLE LAMINATES BY PEEL TESTING: FIXED ARM AND T-PEEL METHODS 1 A PROTOCOL FOR DETERMINATION OF THE ADHESIVE FRACTURE TOUGHNESS OF FLEXIBLE LAMINATES BY PEEL TESTING: FIXED ARM AND T-PEEL METHODS An ESIS Protocol Revised June 2007, Nov 2010 D R Moore, J G Williams

More information

MSE 383, Unit 3-3. Joshua U. Otaigbe Iowa State University Materials Science & Engineering Dept.

MSE 383, Unit 3-3. Joshua U. Otaigbe Iowa State University Materials Science & Engineering Dept. Dynamic Mechanical Behavior MSE 383, Unit 3-3 Joshua U. Otaigbe Iowa State University Materials Science & Engineering Dept. Scope Why DMA & TTS? DMA Dynamic Mechanical Behavior (DMA) Superposition Principles

More information

The mechanical behaviour of poly(vinyl butyral) at different

The mechanical behaviour of poly(vinyl butyral) at different *Manuscript Click here to download Manuscript: jmatsci_paper.tex Click here to view linked References 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 Journal of Materials Science manuscript No. (will be inserted by the

More information

UNIT I SIMPLE STRESSES AND STRAINS

UNIT I SIMPLE STRESSES AND STRAINS Subject with Code : SM-1(15A01303) Year & Sem: II-B.Tech & I-Sem SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR Siddharth Nagar, Narayanavanam Road 517583 QUESTION BANK (DESCRIPTIVE) UNIT I SIMPLE STRESSES

More information

LAMINATION THEORY FOR THE STRENGTH OF FIBER COMPOSITE MATERIALS

LAMINATION THEORY FOR THE STRENGTH OF FIBER COMPOSITE MATERIALS XXII. LAMINATION THEORY FOR THE STRENGTH OF FIBER COMPOSITE MATERIALS Introduction The lamination theory for the elastic stiffness of fiber composite materials is the backbone of the entire field, it holds

More information

1.103 CIVIL ENGINEERING MATERIALS LABORATORY (1-2-3) Dr. J.T. Germaine Spring 2004 LABORATORY ASSIGNMENT NUMBER 6

1.103 CIVIL ENGINEERING MATERIALS LABORATORY (1-2-3) Dr. J.T. Germaine Spring 2004 LABORATORY ASSIGNMENT NUMBER 6 1.103 CIVIL ENGINEERING MATERIALS LABORATORY (1-2-3) Dr. J.T. Germaine MIT Spring 2004 LABORATORY ASSIGNMENT NUMBER 6 COMPRESSION TESTING AND ANISOTROPY OF WOOD Purpose: Reading: During this laboratory

More information

MATERIALS. Why do things break? Why are some materials stronger than others? Why is steel tough? Why is glass brittle?

MATERIALS. Why do things break? Why are some materials stronger than others? Why is steel tough? Why is glass brittle? MATERIALS Why do things break? Why are some materials stronger than others? Why is steel tough? Why is glass brittle? What is toughness? strength? brittleness? Elemental material atoms: A. Composition

More information

Materials and Structures. Indian Institute of Technology Kanpur

Materials and Structures. Indian Institute of Technology Kanpur Introduction to Composite Materials and Structures Nachiketa Tiwari Indian Institute of Technology Kanpur Lecture 16 Behavior of Unidirectional Composites Lecture Overview Mt Material ilaxes in unidirectional

More information

Non-conventional Glass fiber NCF composites with thermoset and thermoplastic matrices. F Talence, France Le Cheylard, France

Non-conventional Glass fiber NCF composites with thermoset and thermoplastic matrices. F Talence, France Le Cheylard, France 20 th International Conference on Composite Materials Copenhagen, 19-24th July 2015 Non-conventional Glass fiber NCF composites with thermoset and thermoplastic matrices. Thierry Lorriot 1, Jalal El Yagoubi

More information

ISO 178 INTERNATIONAL STANDARD. Plastics Determination of flexural properties. Plastiques Détermination des propriétés en flexion

ISO 178 INTERNATIONAL STANDARD. Plastics Determination of flexural properties. Plastiques Détermination des propriétés en flexion INTERNATIONAL STANDARD ISO 178 Fifth edition 2010-12-15 Plastics Determination of flexural properties Plastiques Détermination des propriétés en flexion Reference number ISO 178:2010(E) ISO 2010 PDF disclaimer

More information

QUESTION BANK Composite Materials

QUESTION BANK Composite Materials QUESTION BANK Composite Materials 1. Define composite material. 2. What is the need for composite material? 3. Mention important characterits of composite material 4. Give examples for fiber material 5.

More information

Nonlinear Viscoelastic Behaviour of Rubber Composites

Nonlinear Viscoelastic Behaviour of Rubber Composites Nonlinear Viscoelastic Behaviour of Rubber Composites Sabu Thomas Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam India 1 Polymer Nanocomposites Spheres (0D) TiO 2, SiO 2

More information

MECHANICS OF MATERIALS

MECHANICS OF MATERIALS Third E CHAPTER 2 Stress MECHANICS OF MATERIALS Ferdinand P. Beer E. Russell Johnston, Jr. John T. DeWolf Lecture Notes: J. Walt Oler Texas Tech University and Strain Axial Loading Contents Stress & Strain:

More information

Soil strength. the strength depends on the applied stress. water pressures are required

Soil strength. the strength depends on the applied stress. water pressures are required Soil Strength Soil strength u Soils are essentially frictional materials the strength depends on the applied stress u Strength is controlled by effective stresses water pressures are required u Soil strength

More information

SERVICEABILITY OF BEAMS AND ONE-WAY SLABS

SERVICEABILITY OF BEAMS AND ONE-WAY SLABS CHAPTER REINFORCED CONCRETE Reinforced Concrete Design A Fundamental Approach - Fifth Edition Fifth Edition SERVICEABILITY OF BEAMS AND ONE-WAY SLABS A. J. Clark School of Engineering Department of Civil

More information

Anisotropic modeling of short fibers reinforced thermoplastics materials with LS-DYNA

Anisotropic modeling of short fibers reinforced thermoplastics materials with LS-DYNA Anisotropic modeling of short fibers reinforced thermoplastics materials with LS-DYNA Alexandre Hatt 1 1 Faurecia Automotive Seating, Simplified Limited Liability Company 1 Abstract / Summary Polymer thermoplastics

More information

Pullout Tests of Geogrids Embedded in Non-cohesive Soil

Pullout Tests of Geogrids Embedded in Non-cohesive Soil Archives of Hydro-Engineering and Environmental Mechanics Vol. 51 (2004), No. 2, pp. 135 147 Pullout Tests of Geogrids Embedded in Non-cohesive Soil Angelika Duszyńska, Adam F. Bolt Gdansk University of

More information

PRELIMINARY PREDICTION OF SPECIMEN PROPERTIES CLT and 1 st order FEM analyses

PRELIMINARY PREDICTION OF SPECIMEN PROPERTIES CLT and 1 st order FEM analyses OPTIMAT BLADES Page 1 of 24 PRELIMINARY PREDICTION OF SPECIMEN PROPERTIES CLT and 1 st order FEM analyses first issue Peter Joosse CHANGE RECORD Issue/revision date pages Summary of changes draft 24-10-02

More information

Chapter 6: Mechanical Properties of Metals. Dr. Feras Fraige

Chapter 6: Mechanical Properties of Metals. Dr. Feras Fraige Chapter 6: Mechanical Properties of Metals Dr. Feras Fraige Stress and Strain Tension Compression Shear Torsion Elastic deformation Plastic Deformation Yield Strength Tensile Strength Ductility Toughness

More information

Testing and Analysis

Testing and Analysis Testing and Analysis Testing Elastomers for Hyperelastic Material Models in Finite Element Analysis 2.6 2.4 2.2 2.0 1.8 1.6 1.4 Biaxial Extension Simple Tension Figure 1, A Typical Final Data Set for Input

More information

DIGITAL IMAGE CORRELATION TECHNIQUE IN MEASURING DEFORMATION AND FAILURE OF COMPOSITE AND ADHESIVE

DIGITAL IMAGE CORRELATION TECHNIQUE IN MEASURING DEFORMATION AND FAILURE OF COMPOSITE AND ADHESIVE DIGITAL IMAGE CORRELATION TECHNIQUE IN MEASURING DEFORMATION AND FAILURE OF COMPOSITE AND ADHESIVE Ab Ghani A. F Sustainable Maintenance Engineering Research Group, Universiti Teknikal Malaysia Melaka,

More information

Finite-Element Analysis of Stress Concentration in ASTM D 638 Tension Specimens

Finite-Element Analysis of Stress Concentration in ASTM D 638 Tension Specimens Monika G. Garrell, 1 Albert J. Shih, 2 Edgar Lara-Curzio, 3 and Ronald O. Scattergood 4 Journal of Testing and Evaluation, Vol. 31, No. 1 Paper ID JTE11402_311 Available online at: www.astm.org Finite-Element

More information

Modelling Methodology for Linear Elastic Compound Modelling Versus Visco-Elastic Compound Modelling

Modelling Methodology for Linear Elastic Compound Modelling Versus Visco-Elastic Compound Modelling Modelling Methodology for Linear Elastic Compound Modelling Versus Visco-Elastic Compound Modelling R.B.R van Silfhout 1), J.G.J Beijer 1), Kouchi Zhang 1), W.D. van Driel 2) 1) Philips Applied Technologies,

More information

Mechanical characterization of visco termo elastic properties of a polymer interlayer by dynamic tests

Mechanical characterization of visco termo elastic properties of a polymer interlayer by dynamic tests Mechanical characterization of visco termo elastic properties of a polymer interlayer by dynamic tests Laura Andreozzi 1, Silvia Briccoli Bati 2, Mario Fagone 2 Giovanna Ranocchiai 2 Fabio Zulli 1 1 Department

More information

The Influence of Strain Amplitude, Temperature and Frequency on Complex Shear Moduli of Polymer Materials under Kinematic Harmonic Loading

The Influence of Strain Amplitude, Temperature and Frequency on Complex Shear Moduli of Polymer Materials under Kinematic Harmonic Loading Mechanics and Mechanical Engineering Vol. 21, No. 1 (2017) 157 170 c Lodz University of Technology The Influence of Strain Amplitude, Temperature and Frequency on Complex Shear Moduli of Polymer Materials

More information

Modelling of viscoelastic properties of a curing adhesive

Modelling of viscoelastic properties of a curing adhesive Computational Methods and Experiments in Materials Characterisation III 241 Modelling of viscoelastic properties of a curing adhesive J. de Vreugd 1, K. M. B. Jansen 1, L. J. Ernst 1 & J. A. C. M. Pijnenburg

More information

PLATE GIRDERS II. Load. Web plate Welds A Longitudinal elevation. Fig. 1 A typical Plate Girder

PLATE GIRDERS II. Load. Web plate Welds A Longitudinal elevation. Fig. 1 A typical Plate Girder 16 PLATE GIRDERS II 1.0 INTRODUCTION This chapter describes the current practice for the design of plate girders adopting meaningful simplifications of the equations derived in the chapter on Plate Girders

More information

ASPECTS CONCERNING TO THE MECHANICAL PROPERTIES OF THE GLASS / FLAX / EPOXY COMPOSITE MATERIAL

ASPECTS CONCERNING TO THE MECHANICAL PROPERTIES OF THE GLASS / FLAX / EPOXY COMPOSITE MATERIAL 5 th International Conference Advanced Composite Materials Engineering COMAT 2014 16-17 October 2014, Braşov, Romania ASPECTS CONCERNING TO THE MECHANICAL PROPERTIES OF THE GLASS / FLAX / EPOXY COMPOSITE

More information

Agnieszka Bondyra, Pawe Gotowicki

Agnieszka Bondyra, Pawe Gotowicki Journal of KONES Powertrain and Transport, Vol. 17, No. 1 21 INFLUENCE OF A CROSSHEAD RATE AND A NUMBER OF STRESS CYCLES ON MEASUREMENT RESULTS IN THE IN-PLANE SHEAR TEST FOR A CROSS-PLY VINYLESTER-CARBON

More information

TECHNICAL PAPER INVESTIGATION INTO THE VALIDATION OF THE SHELL FATIGUE TRANSFER FUNCTION

TECHNICAL PAPER INVESTIGATION INTO THE VALIDATION OF THE SHELL FATIGUE TRANSFER FUNCTION Authors: TECHNICAL PAPER INVESTIGATION INTO THE VALIDATION OF THE SHELL FATIGUE TRANSFER FUNCTION Anthony Stubbs (Presenter), BE(Hons), Masters student, University of Canterbury. aps49@student.canterbury.ac.nz.

More information

Long-term behaviour of GRP pipes

Long-term behaviour of GRP pipes Long-term behaviour of GRP pipes H. Faria ( 1 ), A.Vieira ( 1 ), J. Reis ( 1 ), A. T. Marques ( 2 ), R. M. Guedes ( 2 ), A. J. M. Ferreira ( 2 ) 1 INEGI - Instituto de Engenharia Mecânica e Gestão Industrial,

More information

Lecture 8 Viscoelasticity and Deformation

Lecture 8 Viscoelasticity and Deformation HW#5 Due 2/13 (Friday) Lab #1 Due 2/18 (Next Wednesday) For Friday Read: pg 130 168 (rest of Chpt. 4) 1 Poisson s Ratio, μ (pg. 115) Ratio of the strain in the direction perpendicular to the applied force

More information

Fundamentals of Durability. Unrestricted Siemens AG 2013 All rights reserved. Siemens PLM Software

Fundamentals 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 information

THE ROLE OF DELAMINATION IN NOTCHED AND UNNOTCHED TENSILE STRENGTH

THE ROLE OF DELAMINATION IN NOTCHED AND UNNOTCHED TENSILE STRENGTH THE ROLE OF DELAMINATION IN NOTCHED AND UNNOTCHED TENSILE STRENGTH M. R. Wisnom University of Bristol Advanced Composites Centre for Innovation and Science University Walk, Bristol BS8 1TR, UK M.Wisnom@bristol.ac.uk

More information

6. NON-LINEAR PSEUDO-STATIC ANALYSIS OF ADOBE WALLS

6. NON-LINEAR PSEUDO-STATIC ANALYSIS OF ADOBE WALLS 6. NON-LINEAR PSEUDO-STATIC ANALYSIS OF ADOBE WALLS Blondet et al. [25] carried out a cyclic test on an adobe wall to reproduce its seismic response and damage pattern under in-plane loads. The displacement

More information

FCP 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 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 information

ANSYS Mechanical Basic Structural Nonlinearities

ANSYS Mechanical Basic Structural Nonlinearities Lecture 4 Rate Independent Plasticity ANSYS Mechanical Basic Structural Nonlinearities 1 Chapter Overview The following will be covered in this Chapter: A. Background Elasticity/Plasticity B. Yield Criteria

More information

University Graz / Austria Institut für Chemie Volker Ribitsch

University Graz / Austria Institut für Chemie Volker Ribitsch University Graz / Austria Institut für Chemie Volker Ribitsch 1 Rheology Oscillatory experiments Dynamic experiments Deformation of materials under non-steady conditions in the linear viscoelastic range

More information

MODELING SLAB-COLUMN CONNECTIONS REINFORCED WITH GFRP UNDER LOCALIZED IMPACT

MODELING SLAB-COLUMN CONNECTIONS REINFORCED WITH GFRP UNDER LOCALIZED IMPACT MODELING SLAB-COLUMN CONNECTIONS REINFORCED WITH GFRP UNDER LOCALIZED IMPACT QI ZHANG and AMGAD HUSSEIN Faculty of Engineering, Memorial University of Newfoundland St. John s, Newfoundland, Canada, A1B

More information

Pressure Vessels Stresses Under Combined Loads Yield Criteria for Ductile Materials and Fracture Criteria for Brittle Materials

Pressure Vessels Stresses Under Combined Loads Yield Criteria for Ductile Materials and Fracture Criteria for Brittle Materials Pressure Vessels Stresses Under Combined Loads Yield Criteria for Ductile Materials and Fracture Criteria for Brittle Materials Pressure Vessels: In the previous lectures we have discussed elements subjected

More information

Finite Element Modelling with Plastic Hinges

Finite Element Modelling with Plastic Hinges 01/02/2016 Marco Donà Finite Element Modelling with Plastic Hinges 1 Plastic hinge approach A plastic hinge represents a concentrated post-yield behaviour in one or more degrees of freedom. Hinges only

More information

CONSISTENCY OF RHEOLOGICAL EXPERIMENTS FOR PSA CHARACTERIZATION

CONSISTENCY OF RHEOLOGICAL EXPERIMENTS FOR PSA CHARACTERIZATION CONSISTENCY OF RHEOLOGICAL EXPERIMENTS FOR PSA CHARACTERIZATION Dr. Laura Yao, Senior Research Chemist, Scapa North America, Windsor, CT Robert Braiewa, Research Chemist, Scapa North America, Windsor,

More information

Rheology, Adhesion, and Debonding of Lightly Cross-linked Polymer Gels

Rheology, Adhesion, and Debonding of Lightly Cross-linked Polymer Gels Rheology, Adhesion, and Debonding of Lightly Cross-linked Polymer Gels Nicholas B. Wyatt, and Anne M. Grillet 2 Materials Science and Engineering Division 2 Engineering Sciences Division Sandia National

More information

Comparison between the visco-elastic dampers And Magnetorheological dampers and study the Effect of temperature on the damping properties

Comparison between the visco-elastic dampers And Magnetorheological dampers and study the Effect of temperature on the damping properties Comparison between the visco-elastic dampers And Magnetorheological dampers and study the Effect of temperature on the damping properties A.Q. Bhatti National University of Sciences and Technology (NUST),

More information

Shear Behaviour of Fin Plates to Tubular Columns at Ambient and Elevated Temperatures

Shear Behaviour of Fin Plates to Tubular Columns at Ambient and Elevated Temperatures Shear Behaviour of Fin Plates to Tubular Columns at Ambient and Elevated Temperatures Mark Jones Research Student, University of Manchester, UK Dr. Yong Wang Reader, University of Manchester, UK Presentation

More information

Role of Binders in Pavement Performance

Role of Binders in Pavement Performance Role of Binders in Pavement Performance Presented by H. Bahia Research conducted by The University of Wisconsin-Asphalt Group The Pavement Performance Prediction Symposium Western Research Institute, Laramie,

More information

Mechanical Models for Asphalt Behavior and Performance

Mechanical Models for Asphalt Behavior and Performance Mechanical Models for Asphalt Behavior and Performance All Attendees Are Muted Questions and Answers Please type your questions into your webinar control panel We will read your questions out loud, and

More information

ME 582 Advanced Materials Science. Chapter 2 Macromechanical Analysis of a Lamina (Part 2)

ME 582 Advanced Materials Science. Chapter 2 Macromechanical Analysis of a Lamina (Part 2) ME 582 Advanced Materials Science Chapter 2 Macromechanical Analysis of a Lamina (Part 2) Laboratory for Composite Materials Research Department of Mechanical Engineering University of South Alabama, Mobile,

More information

Tensile behaviour of anti-symmetric CFRP composite

Tensile behaviour of anti-symmetric CFRP composite Available online at www.sciencedirect.com Procedia Engineering 1 (211) 1865 187 ICM11 Tensile behaviour of anti-symmetric CFRP composite K. J. Wong a,b, *, X. J. Gong a, S. Aivazzadeh a, M. N. Tamin b

More information

Don Robbins, Andrew Morrison, Rick Dalgarno Autodesk, Inc., Laramie, Wyoming. Abstract

Don Robbins, Andrew Morrison, Rick Dalgarno Autodesk, Inc., Laramie, Wyoming. Abstract PROGRESSIVE FAILURE SIMULATION OF AS-MANUFACTURED SHORT FIBER FILLED INJECTION MOLDED PARTS: VALIDATION FOR COMPLEX GEOMETRIES AND COMBINED LOAD CONDITIONS Don Robbins, Andrew Morrison, Rick Dalgarno Autodesk,

More information

3D Finite Element analysis of stud anchors with large head and embedment depth

3D Finite Element analysis of stud anchors with large head and embedment depth 3D Finite Element analysis of stud anchors with large head and embedment depth G. Periškić, J. Ožbolt & R. Eligehausen Institute for Construction Materials, University of Stuttgart, Stuttgart, Germany

More information

Concrete Technology Prof. B. Bhattacharjee Department of Civil Engineering Indian Institute of Technology, Delhi

Concrete Technology Prof. B. Bhattacharjee Department of Civil Engineering Indian Institute of Technology, Delhi Concrete Technology Prof. B. Bhattacharjee Department of Civil Engineering Indian Institute of Technology, Delhi Lecture - 25 Strength of Concrete: Factors Affecting Test Results Welcome to module 6, lecture

More information

Introduction to Fracture

Introduction to Fracture Introduction to Fracture Introduction Design of a component Yielding Strength Deflection Stiffness Buckling critical load Fatigue Stress and Strain based Vibration Resonance Impact High strain rates Fracture

More information

EXPERIMENTAL STUDY ON YOUNG S MODULUS E OF A POLYMER COMPOSITE REINFORCED BY NANO TITANIUM DIOXIDE PARTICLES

EXPERIMENTAL STUDY ON YOUNG S MODULUS E OF A POLYMER COMPOSITE REINFORCED BY NANO TITANIUM DIOXIDE PARTICLES Vietnam Journal of Mechanics, VAST, Vol. 34, No. (202), pp. 9 25 EXPERIMENTAL STUDY ON YOUNG S MODULUS E OF A POLYMER COMPOSITE REINFORCED BY NANO TITANIUM DIOXIDE PARTICLES Nguyen Dinh Duc, Dinh Khac

More information

Further Applications of Newton s Laws - Friction Static and Kinetic Friction

Further Applications of Newton s Laws - Friction Static and Kinetic Friction urther pplications of Newton s Laws - riction Static and Kinetic riction The normal force is related to friction. When two surfaces slid over one another, they experience a force do to microscopic contact

More information

CHAPTER 3 THE EFFECTS OF FORCES ON MATERIALS

CHAPTER 3 THE EFFECTS OF FORCES ON MATERIALS CHAPTER THE EFFECTS OF FORCES ON MATERIALS EXERCISE 1, Page 50 1. A rectangular bar having a cross-sectional area of 80 mm has a tensile force of 0 kn applied to it. Determine the stress in the bar. Stress

More information

MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING CAMBRIDGE, MASSACHUSETTS 02139

MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING CAMBRIDGE, MASSACHUSETTS 02139 MASSACHUSES INSIUE OF ECHNOLOGY DEPARMEN OF MAERIALS SCIENCE AND ENGINEERING CAMBRIDGE, MASSACHUSES 02139 3.22 MECHANICAL PROPERIES OF MAERIALS PROBLEM SE 5 SOLUIONS 1. (Hertzber 6.2) If it takes 300 seconds

More information

Time-Temperature Superposition to determine the Stress- Rupture of Aramid Fibres

Time-Temperature Superposition to determine the Stress- Rupture of Aramid Fibres Preprint 1 of 19 Time-Temperature Superposition to determine the Stress- Rupture of Aramid Fibres K G N C Alwis and C J Burgoyne W S Atkins University of Cambridge Corresponding Author Dr C J Burgoyne

More information

Fatigue failure mechanisms of thin-walled hybrid plate girders

Fatigue failure mechanisms of thin-walled hybrid plate girders Fatigue failure mechanisms of thin-walled hybrid plate girders Pavol Juhás1,* 1Institute of Technology and Business in České Budějovice, Department of Civil Engineering, Okružní 517/10, 37001 České Budějovice,

More information

STRATEGIES FOR RHEOLOGICAL EVALUATION OF PRESSURE SENSITIVE ADHESIVES

STRATEGIES FOR RHEOLOGICAL EVALUATION OF PRESSURE SENSITIVE ADHESIVES STRATEGIES FOR RHEOLOGICAL EVALUATION OF PRESSURE SENSITIVE ADHESIVES Tianhong T. Chen, Sr. Applications Scientist, TA Instruments Waters LLC, 59 Lukens Drive, New Castle, DE 9720 Abstract Pressure sensitive

More information

Figure 1. Dimension of PSA in face paper laminate

Figure 1. Dimension of PSA in face paper laminate EVALUATION OF DYNAMIC MECHANICAL PROPERTIES OF PRESSURE SENSITIVE ADHESIVE IN PAPER LANIMATES FOR POSTAGE STAMP APPLICATION: METHOD DEVELOPMENT AND ADHESIVE CHARACTERIZATION Hailing Yang, Graduate Student,

More information

THE COMPRESSION OF BONDED RUBBER DISKS ABSTRACT

THE COMPRESSION OF BONDED RUBBER DISKS ABSTRACT Downloaded from http://polymerphysics.net THE COMPRESSION OF BONDED RUBBER DISKS M. L. ANDERSON, P. H. MOTT,* C. M. ROLAND CHEMISTRY DIVISION, NAVAL RESEARCH LABORATORY, WASHINGTON, DC 20375 ABSTRACT Compressive

More information

Numerical simulation of plug-assisted thermoforming: application to polystyrene C.A. Bernard 1, a, J.P.M. Correia 1,b, N. Bahlouli 1,c and S.

Numerical simulation of plug-assisted thermoforming: application to polystyrene C.A. Bernard 1, a, J.P.M. Correia 1,b, N. Bahlouli 1,c and S. Key Engineering Materials Vols. 554-557 (2013) pp 1602-1610 (2013) Trans Tech Publications, Switzerland doi:10.4028/www.scientific.net/kem.554-557.1602 Numerical simulation of plug-assisted thermoforming:

More information

Plane Strain Test for Metal Sheet Characterization

Plane Strain Test for Metal Sheet Characterization Plane Strain Test for Metal Sheet Characterization Paulo Flores 1, Felix Bonnet 2 and Anne-Marie Habraken 3 1 DIM, University of Concepción, Edmundo Larenas 270, Concepción, Chile 2 ENS - Cachan, Avenue

More information

ISSN: ISO 9001:2008 Certified International Journal of Engineering Science and Innovative Technology (IJESIT) Volume 2, Issue 4, July 2013

ISSN: ISO 9001:2008 Certified International Journal of Engineering Science and Innovative Technology (IJESIT) Volume 2, Issue 4, July 2013 Delamination Studies in Fibre-Reinforced Polymer Composites K.Kantha Rao, Dr P. Shailesh, K. Vijay Kumar 1 Associate Professor, Narasimha Reddy Engineering College Hyderabad. 2 Professor, St. Peter s Engineering

More information

Strain-Based Design Model for FRP-Confined Concrete Columns

Strain-Based Design Model for FRP-Confined Concrete Columns SP-230 57 Strain-Based Design Model for FRP-Confined Concrete Columns by N. Saenz and C.P. Pantelides Synopsis: A constitutive strain-based confinement model is developed herein for circular concrete columns

More information

Viscoelasticity. Basic Notions & Examples. Formalism for Linear Viscoelasticity. Simple Models & Mechanical Analogies. Non-linear behavior

Viscoelasticity. Basic Notions & Examples. Formalism for Linear Viscoelasticity. Simple Models & Mechanical Analogies. Non-linear behavior Viscoelasticity Basic Notions & Examples Formalism for Linear Viscoelasticity Simple Models & Mechanical Analogies Non-linear behavior Viscoelastic Behavior Generic Viscoelasticity: exhibition of both

More information

USE OF RHEOLOGY AS A DEVELOPING AND TROUBLESHOOTING TOOL FOR PSA APPLICATIONS.

USE OF RHEOLOGY AS A DEVELOPING AND TROUBLESHOOTING TOOL FOR PSA APPLICATIONS. USE OF RHEOLOGY AS A DEVELOPING AND TROUBLESHOOTING TOOL FOR PSA APPLICATIONS. Michael DeFrancisis, Applications Engineer, Henkel, Bridgewater, NJ Yayun Liu, Senior Development Scientist, Henkel, Bridgewater,

More information

Unified Constitutive Model for Engineering- Pavement Materials and Computer Applications. University of Illinois 12 February 2009

Unified Constitutive Model for Engineering- Pavement Materials and Computer Applications. University of Illinois 12 February 2009 Unified Constitutive Model for Engineering- Pavement Materials and Computer Applications Chandrakant S. Desai Kent Distinguished i Lecture University of Illinois 12 February 2009 Participation in Pavements.

More information

Finite element modelling of infinitely wide Angle-ply FRP. laminates

Finite element modelling of infinitely wide Angle-ply FRP. laminates www.ijaser.com 2012 by the authors Licensee IJASER- Under Creative Commons License 3.0 editorial@ijaser.com Research article ISSN 2277 9442 Finite element modelling of infinitely wide Angle-ply FRP laminates

More information

ACET 406 Mid-Term Exam B

ACET 406 Mid-Term Exam B ACET 406 Mid-Term Exam B SUBJECT: ACET 406, INSTRUCTOR: Dr Antonis Michael, DATE: 24/11/09 INSTRUCTIONS You are required to answer all of the following questions within the specified time (90 minutes).you

More information

Initial Stress Calculations

Initial Stress Calculations Initial Stress Calculations The following are the initial hand stress calculations conducted during the early stages of the design process. Therefore, some of the material properties as well as dimensions

More information

Module 7: Micromechanics Lecture 29: Background of Concentric Cylinder Assemblage Model. Introduction. The Lecture Contains

Module 7: Micromechanics Lecture 29: Background of Concentric Cylinder Assemblage Model. Introduction. The Lecture Contains Introduction In this lecture we are going to introduce a new micromechanics model to determine the fibrous composite effective properties in terms of properties of its individual phases. In this model

More information

Quiz 1. Introduction to Polymers

Quiz 1. Introduction to Polymers 100406 Quiz 1. Introduction to Polymers 1) Polymers are different than low-molecular weight oligomers. For example an oligomeric polyethylene is wax, oligomeric polystyrene is similar to naphthalene (moth

More information

Transactions on Modelling and Simulation vol 10, 1995 WIT Press, ISSN X

Transactions on Modelling and Simulation vol 10, 1995 WIT Press,  ISSN X Parameters controlling the numerical simulation validity of damageable composite toughness testing S. Yotte, C. Currit, E. Lacoste, J.M. Quenisset Laboratoire de Genie Meanique - IUT 'A\ Domaine Universitaire,

More information

Polymer Dynamics and Rheology

Polymer Dynamics and Rheology Polymer Dynamics and Rheology 1 Polymer Dynamics and Rheology Brownian motion Harmonic Oscillator Damped harmonic oscillator Elastic dumbbell model Boltzmann superposition principle Rubber elasticity and

More information

Uncertainties associated with the use of a sound level meter

Uncertainties associated with the use of a sound level meter NPL REPORT DQL-AC 002 Uncertainties associated with the use of a sound level meter Richard Payne April 2004 April 2004 ABSTRACT Uncertainties associated with the use of a sound level meter Richard Payne

More information

TINIUS OLSEN Testing Machine Co., Inc.

TINIUS OLSEN Testing Machine Co., Inc. Interpretation of Stress-Strain Curves and Mechanical Properties of Materials Tinius Olsen has prepared this general introduction to the interpretation of stress-strain curves for the benefit of those

More information

Constitutive and Damage Accumulation Modeling

Constitutive and Damage Accumulation Modeling Workshop on Modeling and Data needs for Lead-Free Solders Sponsored by NEMI, NIST, NSF, and TMS February 15, 001 New Orleans, LA Constitutive and Damage Accumulation Modeling Leon M. Keer Northwestern

More information