Abstract
Experimental and analytical results are presented for the post-failure behavior of unnotched quasi-isotropic glass-epoxy laminates. The analysis is based on a simplified tangent modulus method and a maximum stress ply failure criterion. Several ply failure models are considered, involving vari ous combinations of stiffness reduction. The most significant finding is that matrix failure in the 90° layers must be supplemented by reduction of E11 as a result of a fiber instability mode.
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