基于最大轴向力的Kevlar复合材料分层缺陷预测
2020-11-11
作者：巩文东1，2，林毓梁1，李颖1
单位：1山东职业学院；2天津工业大学机械工程学院
摘要：针对Kevlar复合材料纤维韧性足和剪切强度大的特点，分析切削过程的抗力来源，将钻削过程简化为同时切削多根Kevlar纤维并发生剪切破坏的力学模型，在瞬时切削速度方向和纤维方向所形成的平面上进行二维正交切削分析，建立最大轴向力预测模型；根据复合材料的分层缺陷机理，计算分层临界轴向力；设计单因素加工参数试验，并使用水浸超声检测设备检测分层缺陷。试验结果表明：预测最大轴向力大于分层临界轴向力时，发生分层缺陷的比例达到78%；预测最大轴向力小于分层临界轴向力时，均没有发生分层缺陷。
关键词：Kevlar复合材料；钻削；剪切；轴向力；分层
中图分类号：TG704；TH162.1文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.10.019
Deliamination Prediction of KFRP Composite Based on Maximum Axis Force
Gong Wendong，Lin Yuliang，Li Ying
Abstract:Pointing to the strong toughness and high shear strength of KFRP composites，the reason of the force during cutting process is analyzed to simplified the cutting process to be the model that cutting down several kevlar fiber in the same time.The orthogonal cutting is analyzed in the plane formed by the instantaneous cutting speed direction and the fiber direction to establish the maximum axis force prediction model.The critical axial force of delamination is figured out.The single factor parameter drilling experiment is designed and the delamination is tested by the immersion ultrasonic testing equipment.The experimental results indicate that when the predicted axis force is bigger than the critical axial force of delamination，the delamination incidence is reached 78%；when the predicted axis force is smaller than the critical axial force of delamination，no delamination is occurred.
Keywords:KFRP composite；drill；shear；axis force；delamination