冲击作用下斜接修补CFRP层间分层和胶层的损伤机制及参数分析
Damage mechanism of laminates delamination and bondline for scarf repaired CFRP under impact and parameter study

首先，针对斜接修补CFRP抗冲击性能差的问题，分别使用基于接触的内聚力模型（SCZM）和基于单元的内聚力模型（ECZM）描述层间分层和斜接胶层破坏，研究CFRP层板的冲击响应和两种失效的演化规律。然后，分析了冲击能量、斜接角度和预拉伸作用对两种失效的影响。结果表明：层间分层起始时间早于胶层破坏，与冲击能量无关；分层和胶层破坏面积随冲击能量增加而增大，胶层破坏面积增加的更明显；斜接角度主要影响胶层破坏，对分层面积几乎无影响；预拉伸作用对两种失效均具有负面作用。最后，进一步讨论分层对胶层破坏的影响，通过与只考虑胶层破坏的情况进行对比，发现层间分层使胶层破坏的面积降低，延缓了胶层的最终失效。 First, on account of the shortcoming of relative low ability of resistance to the impact load for scarf repaired CFRP, surface based cohesive model(SCZM) and element based cohesive zone model (ECZM) were used to simulate laminates delamination and bondline damage, respectively. The impact response of CFRP and the evolution of two failures were investigated. Then, the influences of the impact energy, scarf angle and pre-tension were studied. Results indicate that the laminates delamination initiates prior to the bondline damage, which is independent of the applied impact energy. The bondline damage area increases much obviously than the laminates delamination with the increasing of impact energy. The scarf angle will significantly influence the bondline damage, while has almost no effect on the laminates delamination area. The pre-tension has negative effect on these two failures. At last, the effect of laminates delamination on bondline damage was further discussed by comparing with the situation that only considered bondline damage. The laminates delamination will reduce the damage area of bondline and delay the catastrophic failure of bondline. 民机预研基金（16Z0317）；中央高校基本科研业务费（G2017KY0003）