Abstract
Leakage through damaged laminates was predicted by using the finite element method (FEM) to determine crack opening displacements (COD) that form the leakage path and computational fluid dynamics to determine the gas flow. Delamination length at crack intersections was estimated based on experimental data under thermal loads only. Leakage under biaxial mechanical and thermal loadings was predicted using this estimated delamination length. Experimental leakage data under biaxial mechanical and thermal loadings were bounded by the models with variable COD predicted by the FEM and constant COD models, in which the effect of surface roughness was approximated by reducing the opening.
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