工艺参数对碳纤维复合材料切削过程亚表面损伤影响的数值建模

摘要

In view of the sub-surface damage during the cutting process of carbon fiber reinforced plastic composites (CFRP),it builds a macro dynamic simulation model of CFRP cutting process based on Hashin failure criterion,analyzes the dynamic formation process of surface-damage and influence of materials fiber orientation and process parameters (tool rake angle,cutting depth and tool nose radius) on the sub-surface damage of the workpiece through orthogonal test and variance analysis.The simulation results show that the sequence of influential factors to the depth of sub-surface damage (Dm) is as follows:fiber orientation ＞ tool edge radius ＞ depth of cut ＞ tool rake angle.Fiber orientation and its interaction with the tool rake angle has significant effect on the sub-surface damage.The contribution rate is 48.12 ％ and 10.86 ％ respectively.The sub-surface damage extended along the cutting direction and the direction of distribution is consistent with the fiber direction.With the increasing of the fiber angle,the depth of the sub-surface damage (Dm) is increased and then decreased.The study results provide a reliable reference for the further understanding of the cutting mechanism of CFRP.%针对碳纤维复合材料(CFRP)切削加工过程中形成的亚表面损伤问题,基于Hashin失效准则,建立了CFRP切削加工宏观动态仿真模型.通过正交试验和方差分析研究材料自身纤维方向及工艺参数(刀具前角、切削深度和刀尖半径)对工件亚表面损伤的影响规律.仿真结果表明:影响亚表面损伤深度Dm的因素主次顺序为纤维方向＞刀尖半径＞切削深度＞刀具前角;纤维方向和刀具前角的交互作用对亚表面损伤具有显著影响,贡献率分别为48.12％和10.86％.亚表面损伤沿着切削方向扩展,并且分布方向大体上与纤维方向一致;随着纤维角度的增加,亚表面损伤深度Dm先增大后减小.研究结果可为进一步了解CFRP的切削机理提供可靠的借鉴.