Proposing of repair method of CFRTP by needle punching and patchbonding

本研究的目的是探讨碳纤维增强塑料（CFRTP）的断裂形态和修复性能。采用四点弯曲试验研究了碳纤维增强塑料（CFRTP）在弯曲载荷作用下的断裂形貌。试验结果表明，当施加2.0%的弯曲应变时，首先出现局部分层。当施加2.5%的弯曲应变时，在压缩侧观察到由于局部屈曲引起的纤维损伤。还评估了贴片粘结对弯曲强度和模量的影响。试验结果表明，在损伤试件上粘贴适当层数的补片可以实现损伤试件的修复，且压侧补片粘贴比拉侧补片粘贴效果好。研究了针刺对CFRTP弯曲性能的影响。试验结果表明，针刺抑制了CFRTP的分层，提高了CFRTP的层间强度。针刺修补和补片粘贴修补的CFRTP的弯曲强度和弯曲模量均高于单纯补片粘贴修补的CFRTP。

The purpose of this study is to investigate the fracture morphology and repairbility of CFRTP. Four-point bending test was conducted to investigate the fracture morphology of CFRTP subjected to bending load. Test results showed that the local delamination was first appeared when the 2.0% of bending strain was applied. When the 2.5% of bending strain was applied, the damage of fiber due to the local buckling was observed at compression side of specimen. The effect of patch bonding on bending strength and modulus was also evaluated. Test results showed that damaged specimen would be repaired when appropriate layer of patch was bonded, and the patch bonding at compression side was more effective than that at tension side. The effect of needle punch on bending characteristics of CFRTP was also evaluated. Test results showed that the interlaminar strength of CFRTP was improved due to the delamination was supressed by needle punch. Moreover , bending strength and modulus of CFRTP repaired by needle punching and patch bonding was higher than that repaired by only patch bonding.