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Research Papers

Modeling and Simulation of the Failure and Stiffness Degradation of a Graphite Epoxy in a Three Point Bending Test

[+] Author and Article Information
E. H. Irhirane, M. Abousaleh, J. Echaabi, M. Hattabi

Equipe de Recherche Appliquée sur les Polymères, Département de Génie Mécanique, ENSEM, Université Hassan II Aïn Chok, BP 8118, Oasis, 20230, Casablanca, Maroc

A. Saouab

Laboratoire de Mécanique Physique et Géosciences du Havre, Université du Havre, 25 Rue Philippe Lebon, BP 540, 76058 Le Havre Cedex, France

M. O. Bensalah1

 Laboratoire de Mécanique et des Matériaux, Avenue Ibn Batouta, BP 1014, Faculté des Sciences, 10106, Rabat, Maroc

1

Corresponding author.

J. Eng. Mater. Technol 132(3), 031013 (Jun 24, 2010) (8 pages) doi:10.1115/1.3078392 History: Received March 02, 2007; Revised November 08, 2008; Published June 24, 2010; Online June 24, 2010

The use of composite materials with continuous fibers in the aeronautic and aerospace industries requires reliable and precise methods for the prediction of failure. Predicting failure stresses and failure modes in composite laminates is very difficult. The choice between failure criteria is complex, and there is a lack of experimental study to validate the result obtained partly because the biaxial tests are still difficult to perform. This work employs a mixed methodology based on a theoretical and an experimental approach to develop a procedure for the choice and the validation of the failure criterion. The comparison is concerned not only with the macroscopic failure but also with the succession of the failure, the failure mode, and the effect of the geometrical parameters of the test specimen. The most general failure criteria are tested by using two approaches of the stiffness reduction. A finite element code has been elaborated within our laboratory for postfailure treatment. The numerical simulation results are compared with the experimental ones and permit us to make a conclusion on the validity of the failure criteria used.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental macroscopic curves of the specimens A, B, and C

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Figure 2

Experimental macroscopic curves of the specimens D, E, and F

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Figure 3

Macroscopic curves of the test specimen D for the maximum stress criterion

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Figure 4

Macroscopic curves of the test specimen D for the strain maximum criterion

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Figure 5

Macroscopic curves of the test specimen D for the Hashin criterion

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Figure 6

Macroscopic curves of test specimen A obtained by the finite element method with the maximum stress criterion

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Figure 7

Macroscopic curves of test specimen A obtained by the finite element method with the maximum strain criterion

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Figure 8

Cumulative macroscopic curves of the test specimen D with the total discount of stiffness

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Figure 9

Cumulative macroscopic curves of the test specimen D with the limited discount (matrix stiffness unchanged)

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