Abstract

Carbon fiber-reinforced plastic (CFRP) is used widely in many industries. During drilling CFRP, exit drill-induced defects such as burrs and delamination are easy to occur. In the existing model, the crack zone is assumed as a circle or an ellipse, and concrete forming process of the delamination and the burrs does not be truly involved. In this study, the formation mechanisms of the delamination and the burrs are analyzed based on the analytical model and the experimental observation. The results indicate that the critical thrust force only reflects the vulnerability of the crack, but cannot determine the size of the crack. The critical deflection of the fibers tip corresponding to the interlaminar crack extension point determines the size of crack. The burrs appear in four fundamental types.

中文翻译：

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UD-CFRP钻头出口损伤的形态特征及形成机理

摘要

碳纤维增强塑料（CFRP）被广泛用于许多行业。在CFRP钻孔过程中，很容易发生出口钻孔引起的毛刺和分层等缺陷。在现有模型中，裂纹区域被假定为圆形或椭圆形，并且分层和毛刺的混凝土成型过程并未真正涉及。本研究基于分析模型和实验观察，分析了分层和毛刺的形成机理。结果表明，临界推力仅反映裂纹的脆弱性，而不能确定裂纹的大小。对应于层间裂纹扩展点的纤维尖端的临界挠度决定了裂纹的大小。毛刺有四种基本类型。