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Mechanical properties of low-velocity impact damaged carbon fibre reinforced polymer laminates: Effects of drilling holes for resin-injection repair

机译：低速冲击损坏的碳纤维增强聚合物层压板的机械性能：钻孔对树脂注入修复的影响

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An important preparatory work of the resin-injection repair process for carbon fibre reinforced polymer laminates, damaged by low-velocity impact, involves drilling vent holes (VHs) and resin-injection holes (RHs). This paper reports the effects of the holes on the laminate mechanical integrity, by comparing the results of pristine and damaged laminates containing one RH in the presence of 4 to 6 VHs. Laminates were damaged by a quasistatic indentation method, followed by drilling. The VH-associated structural damage factor, lambda, yielded no significant difference between pristine and damaged laminates. However, the RH-associated lambda of damaged laminates was significantly higher than pristine ones. In-plane compression testing revealed that holes in damaged laminates reduced the resilience, fracture toughness, fracture strength and strain to fracture but no appreciable trend was observed with increasing number of VHs. The study indicates that RH exerted a greater influence than VH on the degradation of the mechanical properties.
机译：碳纤维增强的聚合物层压板的树脂注入修复工艺的一项重要准备工作是受到低速冲击的破坏，需要钻一些排气孔（VH）和树脂注入孔（RH）。通过比较在4至6 VHs下含有1个RH的原始和损坏的层压板的结果，本文报告了孔对层压板机械完整性的影响。层压板通过准静态压痕方法损坏，然后钻孔。与VH相关的结构破坏系数λ在原始层压板和受损层压板之间没有显着差异。但是，与RH相关的层压板的λ值明显高于原始层压板。面内压缩测试表明，损坏的层压板中的孔会降低回弹力，断裂韧性，断裂强度和断裂应变，但随着VH数量的增加，没有观察到明显的趋势。研究表明，相对于VH，RH对机械性能的下降影响更大。

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