由于复合材料断裂特征的复杂性，尚未给出所受载荷与断裂特征之间的关系，通常认为失效模式与层板的基体、纤维类型及试验温度有关。本研究通过拉伸试验、断口观察等方法研究了碳纤维与玻璃纤维增强树脂基复合材料单向板在-55、23及70℃的0°拉伸失效行为，分析了单向板0°拉伸的断裂特征、失效模式及其影响因素。结果表明：复合材料单向板的0°拉伸主要有2种失效模式，纤维基体断裂和界面失效；由于2种失效模式所占的比例不同，形成多种断口形态；失效模式、断裂特征与复合材料的拉伸强度关系不大，主要与界面的结合强度有关；试验温度、纤维、基体等对其断裂特征与失效模式的影响也主要是界面强度变化所致。%Owing to the fracture behavior complexity of composite laminates, the relationship between loads and fracture characteristics has not been obtained. It is generally believed that the failure mode of composite laminates is mainly related to the matrix, fiber and testing temperature, but in the present work, a different result was obtained. The 0° tensile failure behaviors of unidirectional composite laminates of carbon fiber reinforced polymer matrix and glass fiber reinforced polymer matrix were studied by tensile testing at -55 ℃, room temperature and 70 ℃,respectively, as well as observation of the fracture characteristics. The failure modes and influencing factors were analyzed. The results show that there exist two types of failure modes of the unidirectional composite laminates at 0° tensile test: the fracture of fiber and matrix, and the interface failure. Because of different ratio of the two failure modes, there exist different fracture characteristics. Failure modes and fracture characteristics mainly depend on the interface strength of the fiber and matrix. The effect of test temperature, fiber and matrix on the fracture characteristics and failure modes is mainly related to the interface strength.
展开▼
