OS1322-394 Fracture mechanism of intralaminar crack propagation under mode II loading for CFRP laminates

The objective of this study is to evaluate the contribution of fiber bridging on intralaminar and interlaminar fracture toughness under mode II loading in unidirectional CFRP laminates. We used X-ray CT apparatus to capture the 3 dimensional computer graphics (3DCG) of bridging fibers in specimens. By using 3DCG, the bridging process was revealed. Furthermore, we classified bridging fibers into four patterns and counted the number of these fibers from 3DCG. The number of bridging fibers of intralaminar fracture is more than that of interlaminar fracture. Moreover, the density of bridging fibers in the region 5mm behind damage region tip is same as that in the region 10mm behind. The number of bridging fibers under mode II loading is less than that under mode I loading by comparing with the results of our previous study. The characteristic behavior of fiber bridging agrees with the result of fracture toughness test.