利用Hopkinson杆加载装置,对带有单边切口的炭纤维增强复合材料(CFRP)及玻璃纤维增强复合材料(GFRP)层板试件进行冲击拉伸加载实验.根据一维应力波理论求得作用于试件上的载荷P(t)和试件加载点的位移δ(t).根据试样中应力随时间的变化历史σ(t),并基于断裂韧性测试原理,建立了动态应力强度因子K1(t)响应曲线.利用柔度变化率方法确定起裂时间,分别得到在两种加载速率下CFRP、GFRP层板的动态断裂韧性.结果表明,随着加载速率的提高,这两种复合材料的断裂韧性降低.
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