Progressive Failure in Carbon/Epoxy Laminates Under Biaxial Stress

[+] Author and Article Information
S. R. Swanson, A. P. Christoforou

Department of Mechanical and Industrial Engineering, University of Utah, Salt Lake City, Utah 84112

J. Eng. Mater. Technol 109(1), 12-16 (Jan 01, 1987) (5 pages) doi:10.1115/1.3225924 History: Received November 01, 1985; Online September 15, 2009


Despite a number of previous investigations, the question of what criterion to use to predict ultimate failure in fiber composite laminates is still open to question, and particulary so when the overall loading involves biaxial stresses. We have addressed this question by developing a progressive failure model, and comparing the model to experiments on biaxial loading of tubular specimens of quasi-isotropic AS4/3501-6 carbon/epoxy laminates. The progressive failure model uses a modified Tsai-Wu criterion for initial ply cracking, a rule for softening the ply stiffness coefficients with continued straining, and an ultimate failure criterion. It was found that a maximum fiber strain criterion agreed very well with the experiments.

Copyright © 1987 by ASME
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