Evaluation of impact fracture characteristics of laminated composites : enhancement of measurement accuracy

本研究的目的有两个：准确评估(1)层合复合材料的冲击层间剪切强度和(2)II型冲击层间剪切断裂韧性。通过开发改进的Iosipescu试样来测定冲击层间剪切强度，成功地实现了第一个目标。相比之下，第二个目标没有成功实现，因为我们开发的冲击弯曲试验技术不能使我们准确地确定施加在端缺口弯曲试件上的小冲击载荷。为了提高冲击载荷的测量精度，这项工作仍在进行中。

The aim of the present study was two-fold: to accurately evaluate (1) the impact interlaminar shear strength and (2) the mode II impact interlaminar shear fracture toughness of laminated composites.The first aim was successfully accomplished by developing modified Iosipescu specimens for determining the impact interlaminar shear strength. In contrast, the second aim was not successfully achieved, because our developed impact bend test technique did not enable us to accurately determine a small impact load applied to end-notched flexure specimens. This work is still in progress to improve the measurement accuracy of the impact load.