论文部分内容阅读
结合随机渐进失效分析方法和声发射监测对复合材料单向拉伸试件进行损伤分析。结果表明:随机渐进失效方法能很好地反映复合材料失效的随机性和渐进性特征。受载初期,复合材料失效的随机性特征明显,在整个试件内均有失效产生。随着载荷的增加,损伤不断累积,“随机临界核”形成,复合材料很快失效,且一旦有失效产生,纤维断裂数的增加与声发射事件数的累积具有很好的一致性。比较基体开裂和界面脱粘对复合材料拉伸性能的影响:界面脱粘比基体开裂更容易导致复合材料拉伸性能的下降,当不存在基体开裂和界面脱粘时,纤维断裂呈现“集簇”特征,复合材料断裂的脆性特征较为明显。
Combined with random progressive failure analysis method and acoustic emission monitoring, the uniaxial tensile specimens were analyzed for damage. The results show that the stochastic progressive failure method can well reflect the randomness and gradual characteristics of composite failure. At the initial stage of loading, the stochastic character of the failure of the composite material was obvious, and failure occurred in the whole specimen. With the increase of load, the damage accumulates continually, the “critical critical nucleation” forms and the composites fail quickly. In case of failure, the increase of the number of fiber fractures is in good agreement with the cumulative number of AE events. Comparing the effect of matrix cracking and interfacial debonding on the tensile properties of the composites, the interface debonding is more likely to lead to the decrease of the tensile properties of the composites than the matrix cracking. When there is no matrix cracking and interfacial debonding, the fiber fracture shows “ Cluster ”features, brittle fracture characteristics of composite materials is more obvious.