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MULTI-PHYSICS APPROACHES FOR THE BEHAVIOR OF POLYMER-BASED MATERIALS

Strategies for the Analysis of the Behavior of an Adhesive in Bonded Assemblies

[+] Author and Article Information
Jean Yves Cognard1

Romain Créac’hcadec

 Laboratoire Brestois de Mécanique et des Systèmes, ENSTA Bretagne, Université de Brest, ENIB, Université Européenne de Bretagne, ENSTA Bretagne, 2 rue François Verny, 29806 Brest, France

Laurent Sohier

 Laboratoire Brestois de Mécanique et des Systèmes, ENSTA Bretagne, Université de Brest, ENIB, Université Européenne de Bretagne, Université de Brest, 6 Av. Le Gorgeu, CS 93837, 29285 Brest Cedex, France

1

Corresponding author.

J. Eng. Mater. Technol 133(3), 030906 (Jul 05, 2011) (9 pages) doi:10.1115/1.4004049 History: Received May 09, 2010; Revised March 10, 2011; Published July 05, 2011; Online July 05, 2011

Experimental and numerical analyses of the mechanical behavior of bonded joints can be made particularly difficult by the influence of edge effects. Therefore, understanding the stress distribution in an adhesive joint can lead to improvements in adhesively-bonded assemblies. Such an analysis is proposed in the case of usual single lap shear specimens. Stress singularities can contribute to the initiation and propagation of cracks in the adhesive. Thus, in order to obtain reliable experimental data to analyze the nonlinear behavior of an adhesive in an assembly, tests which strongly limit the influence of stress singularities must be proposed. The design and the abilities of such a device for shear tests are presented. Moreover, some experimental results obtained using a modified Arcan fixture, which has been designed to strongly limit edge effects, are presented in the case of monotonic and complex history loadings. Furthermore, a 2D non associated elasto-visco-plastic model is proposed to accurately describe the experimental behavior under tensile-shear monotonic loadings. An extension of this model is also proposed to represent relaxation type effects under shear loadings.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Presentation of the single lap-shear specimen (specimen and close-up view of the central part)

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Figure 2

Normalized stresses through the adhesive thickness along the overlap for steel substrates

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Figure 3

Normalized Mises stress through the adhesive thickness along the overlap

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Figure 4

Experimental results for a TAST test with an adhesive thickness of 0.5 mm (displacement rate of 0.5 mm/min of the tensile machine crosshead and room temperature)

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Figure 5

Prototype of a modified TAST fixture with a small bonded sample (adhesive cross-sectional area: Sc = 9.53 × 25.4 mm²)

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Figure 6

Influence of different parameters on the stress distribution through the adhesive thickness for e = 0.2 mm and for the modified TAST fixture

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Figure 7

Model used for the 3D calculation of the modified TAST specimen

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Figure 8

Normalized equivalent Mises stress through the thickness of the adhesive in the TAST specimen (x and y axes are defined in Fig. 5)

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Figure 9

Experimental results with the modified TAST under monotonic loadings (displacement rate of 0.5 mm/min of the tensile machine crosshead and room temperature)

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Figure 10

The modified Arcan fixture (adhesive cross-sectional area: Sc = 10 × 65 mm²)

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Figure 11

Normalized stress distribution in the mean plane of the adhesive for Arcan test

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Figure 12

Influence of substrate roughness under tensile loading (displacement rate of 0.5 mm/min of the tensile machine crosshead and room temperature)

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Figure 13

Deformation of the adhesive (normal-tangential displacement diagram) [26] (displacement rate of 0.5 mm/min of the tensile machine crosshead and room temperature)

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Figure 14

Experimental results for tensile-shear monotonic loadings (displacement rate of 0.5 mm/min of the tensile machine crosshead and room temperature)

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Figure 15

Variables for a 2D interface elements

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Figure 16

Responses of the nonassociated model under monotonic loadings

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Figure 17

Experimental data measured for a relaxation type loading shear test (γ = 90°) (displacement rate of 0.5 mm/min of the tensile machine crosshead and room temperature)

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Figure 18

Response of the Chase–Goldsmith model under a relaxation type shear test

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