【摘要】 首先,提出了复合材料胶接修补结构与胶接装配结构的冲击损伤容限问题,指出该类结构冲击后拉伸承载能力需要关注。然后,选用基于中心差分法的显式有限元和基于D-B模型的内聚力单元法,以二次名义应力准则为胶层损伤起始准则,并采用混合型幂准则形式的能量释放率准则作为胶层破坏准则。对无损斜胶接CFRP的拉伸基准进行了确定,指出破坏位置、破坏形式和破坏载荷。另外,选取5个典型位置进行损伤容限敏感性的位置研究。在敏感性最高的位置,用不同能量级别的冲击进行胶层损伤分析,并将冲击损伤引入拉伸模型,进行冲击后剩余承载能力规律研究。更多还原

【Abstract】 The damage tolerance issue for structure of composite bonded repair and bonded assembly was put forward and the tension loading capacity after impact was concerned. The explicit FEM of central difference method and dechohesion element method based on D-B model were applied. Quads stress criteria and power law of energy release rate were used to confirm the damage initiation and damage final of adhesive film respectively. Then the basis tension load of undamaged scarf bonded CFRP was determined and the damage location,mode and ultimate load was pointed. In addition,the impact tolerance sensitivity among 5 typical locations was investigated. On the most sensitive location,by loading different levels of impact energy,the adhesive damage was imported into the tension model and the law of residual strength after impact was studied.更多还原