Influence of Interface Fiber Orientation on Delamination Initiation and Growth of Laminated Composites under Mode II Loading

In this study, the effect of interface fiber orientation on delamination initiation and growth of the end notch flexure (ENF) specimen was investigated. The ENF specimens with stacking sequences of [012//012] and [011/90//012] were manufactured by the hand lay-up method and tested based on the ASTM standard. Experimental results show that the interface fiber angle has a significant effect on the initiation and propagation of delamination behavior of ENF specimens. The initiation values of the critical strain energy release rate (SERR) of ENF specimens with 0//90 interface are lower than that of specimens with 0//0 interface. In addition, the specimens with 0//90 interfacehave a stable crack growth.

Keywords:

Mode II , Delamination , End notch flexure , Interface fiber orientation , Crack propagation