Abstract
Abstract In this paper, an experimental investigation and a finite element analysis on interlaminar fracture behavior and fracture toughness of multidirectional composite laminates are presented using end-notch flexure specimens. The (0 / θ) interfaces are considered. The fracture toughness of the interfaces is obtained from the experimental records of load and displacement histories, which is then calibrated by a finite element analysis based on the pseudo three-dimensional assumption. The fracture modes are separated and represented by fracture mode phase angles. Finally, the interlaminar fracture toughness and fracture mode mixities as functions of fiber orientation θ are established.
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