Abstract
Delamination failure criterion is an important tool for characterizing the fracture behavior of laminated composites under mixed loading. In this paper, a fracture envelope was built based on the energy release rate as a fracture criterion of graphite/PEEK laminates. Unidirectional cracked lap shear (CLS) specimens were employed to calculate mode I and mode II energy release rates ( G I, G II. Static fracture tests were conducted using the specimens with two different lap to strap thickness ratios in order to obtain a wide range of G I/ G II values. The G I/ G II values for each thickness ratio were calculated numerically using finite element analysis. The results showed that as a delamination length changes, the G I/ G II varies from 0.13 to 0.48 depending on the lap to strap thickness ratio. It was also found that a linear fracture envelope may be appropriate for a CLS composite specimen.
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