Abstract

The free edge delamination of a graphite-epoxy laminate is simulated using non-linear finite element analysis. Generalised plane strain elements and interface elements have been developed for this purpose. The material behaviour is assumed to be governed by a mode I crack model including strain softening. In this paper a formulation is proposed for strain loading in non-linear analysis under arc length control. In addition, the constitutive model and the finite element formulation for the interface elements are discussed. Mesh objectivity and the influence of fracture energy on delamination growth and laminate strength are examined in the analyses of [+25n/-25n/90n/]S laminates. Results show that the presented approach does not suffer from mesh dependency, which implies that size effects can be described properly.

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