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论文类型：期刊论文

发表时间：2012-09-01

发表刊物：MATERIALS AND MANUFACTURING PROCESSES

收录刊物：SCIE、EI、Scopus

卷号：27

期号：9

页面范围：968-972

ISSN号：1042-6914

关键字：Carbon; Composites; Damage; Drilling; Epoxy; Heat; Modulus; Temperature

摘要：Cutting heat generated during drilling of carbon/epoxy composites has been recognized as a factor to influence the machine quality. This research aims to study the damage induced by cutting heat during drilling. A temperature-dependent experiment was carried out. The temperature of specimen was changed, and the machine parameter was constant in the experiment. The material temperature near exit was measured. Besides, the machine quality was detected, and the failure mode of the machined surface was observed. The results show that the decrease of material stiffness with increasing temperature induces the decrease of machine quality. Furthermore, delamination, transverse crack, high porosity, and fuzzing are mainly caused by low material stiffness. The transverse cracks which join together under cutting force lead to the generation of spalling on exit surface. As temperature increases, the failure modes of the machined surface changes from matrix dominant failure to interface dominant failure. It is predicted that the critical material temperature of damage-free is 186 degrees C.