Mixed mode I/II interlaminar initiation fracture toughness of a secondary bonded pultrusion composite laminate

Quasi-static fracture toughness tests were carried out on four types of beam specimens in order to determine the mixed mode I/II initiation fracture toughness of a secondary bonded laminate composed of uni-directional pultrusion composite plies. The tests included the double cantilever beam (DCB) test for pure mode I; the mixed mode end loaded split (MMELS) test for a mode I dominant mixed mode I/II ratio; the mixed mode bending (MMB) test for a...