Abstract
In the present study, an interlaminer fracture toughness of cross-ply CFRP laminates under mixed mode state are evaluated by MMB (Mixed Mode Bending) tests. 2-Dimensional boundary element analysis are applied to determine complex stress intensity factors which are defined on the interface crack between dissimilar unisotropic laminates. The complex stress intensity factors and mixed mode ratio are extrapolated from stress distribution around the crack tip, then fracture toughness on the interface are calculated by the critical load defived from MMB test. It is shown that the fracture toughness of the cross-ply CFRP laminate depends on the mode ratio of the stress intensity factors K1 and K2. The criterion of the delamination growth is discussed from a standpoint of the mode dependency of the fracture toughness.
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