This paper describes the static compressive response of carbon fibre reinforced plastic (CFRP) laminates with a single or two open holes. Failure is due to 0° fibre microbuckling surrounded by delamination. This is an instability failure mode which initiates at the hole boundary at approximately 80% of the ultimate strength. A two-dimensional finite element analysis is performed to study the interaction effect between a pair of 5 mm diameter holes as a function of hole spacing; for no interaction the hole centres should be placed at least four hole diameters apart. The strength of plates with a single hole is also predicted using a recently developed cohesive zone fracture model.
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