Wang Hongxiao, Wu Yahang, Zhang Yi, Zhang Xiaohui
School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China.
School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Polymers (Basel). 2023 Jan 29;15(3):680. doi: 10.3390/polym15030680.
Previous studies have often assumed that the mechanical properties of Carbon Fibre Reinforced Plastics (CFRP) remain unchanged during drilling. In fact, due to the increase in drilling temperature, the mechanical properties of the composites change greatly, and this then affects the critical force. In addition, previous studies have often assumed that the failure mode of CFRP drilling was a type I crack failure. In fact, due to the complexity of the CFRP drilling process, the failure modes are often coupled with different failure modes, so type I cracks alone cannot reflect the actual cracking situation. Therefore, a three-dimensional drilling Finite Element Modeling (FEM) was established to analyze the failure modes of CFRP drilling delamination, and the I/III mode was determined; then, a new drilling critical force mechanics model, which considers the temperature dependence of CFRP mechanical properties and the failure modes of CFRP drilling delamination, was established based on the classical drilling critical force mechanics model; the results of the mechanics model were validated by drilling critical force experiments under different temperatures. The effects of the temperature dependence of CFRP mechanical properties on the drilling critical force were investigated and analyzed.
以往的研究常常假定碳纤维增强塑料（CFRP）在钻孔过程中的力学性能保持不变。事实上，由于钻孔温度升高，复合材料的力学性能会发生很大变化，进而影响临界力。此外，以往的研究常常假定CFRP钻孔的失效模式为I型裂纹失效。实际上，由于CFRP钻孔过程的复杂性，失效模式往往与不同的失效模式耦合，因此仅I型裂纹并不能反映实际的开裂情况。因此，建立了三维钻孔有限元模型（FEM）来分析CFRP钻孔分层的失效模式，并确定了I/III模式；然后，在经典钻孔临界力力学模型的基础上，建立了一种新的钻孔临界力力学模型，该模型考虑了CFRP力学性能的温度依赖性和CFRP钻孔分层的失效模式；通过不同温度下的钻孔临界力实验对力学模型的结果进行了验证。研究并分析了CFRP力学性能的温度依赖性对钻孔临界力的影响。
