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Fracture Resistance of Carbon/Epoxy Composite Laminates under Mixed-Mode II and III Failure and Its Dependence on Fracture Morphology

The fracture resistance of composite laminates under mixed-mode II and III stable damage propagation conditions and its dependence on the fracture morphology were experimentally studied. Cross-ply carbon/epoxy composite specimens were tested by the double notched split cantilever beam (DNSCB) test method. Complex damage consisting of delaminations and shear-induced matrix cracks grew in the middle of the specimen. The delaminations propagated outside the complex damage region. The energy release rate was decomposed to transverse and parallel components to the fiber, G ST and G SL. The component G ST was almost zero at the simple delamination edges and very high in the region of complex damage. The fracture resistances in the regions of complex damage and simple delaminations were numerically evaluated. The fracture resistance was 1.5–2 times higher in the complex damage region than in the simple delamination region.