Abstract
Free-edge delaminations of fiber-reinforced composite laminates under thermal loading are theoretically investigated. The weak form equilibrium equations are derived for a quasi-three-dimensional problem of laminates and an associated finite element method is used. The strain energy release rate due to the delamination growth is calculated from the finite element method and a newly developed simplified method which is an extension of the method formerly developed by the authors for laminates under mechanical loading. Attention is paid to the longitudinal constraint conditions of laminates, which have significant effects on the energy release rate. Numerical examples are shown for ( 90° 0° ) s cross-ply and ( 45° -45° ) s angle-ply laminates.
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