切削SiCp/Al复合材料的切屑形成及颗粒损伤仿真分析  

Simulation analysis of chips formation and particle damage in cutting SiCp/Al composites

作　　者：武方超 雷小宝[1] 谢峰[1] WU Fangchao;LEI Xiaobao;XIE Feng(School of Electrical Engineering and Automation,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学电气工程与自动化学院,合肥230601

出　　处：《现代制造工程》2023年第5期91-100,共10页Modern Manufacturing Engineering

基　　金：国家自然科学基金资助项目(51975003)。

摘　　要：为探究SiCp/Al复合材料在切削过程中的切屑形成及颗粒损伤过程,运用ABAQUS有限元分析软件建立了考虑颗粒随机分布的SiCp/Al复合材料切削仿真模型,并在模型中分别定义了Al基体、Al基体-SiC颗粒结合界面以及SiC颗粒的损伤失效行为。结果表明,裂纹在Al基体-SiC颗粒结合界面或Al基体中的形成与扩展是导致切屑断裂的主要原因,也是影响切屑形态的主要因素;SiC颗粒存在完全断裂、局部破碎、整体拔出以及局部脱黏等损伤形式,并相应在切削加工表面或亚表面留下划痕、凹坑、孔洞和凸起等缺陷;椭圆形SiC颗粒的中心位置相对于切削路径的位置越高,SiC颗粒越容易脱黏,切削加工表面缺陷也越小;椭圆形SiC颗粒倾斜夹角(椭圆形长轴与切削方向之间的夹角)为135°时,颗粒损伤程度最高,切削加工表面缺陷最大。分析切屑形成和颗粒损伤过程是研究SiCp/Al复合材料切削加工特性的有效途径,对于优化SiCp/Al复合材料的制造工艺,改善SiCp/Al复合材料已加工表面质量具有重要意义。In order to explore the chips formation and particle damage of SiCp/Al composites during the cutting deformation process,the cutting simulation model of SiCp/Al composites was established by using ABAQUS finite element analysis software,and the Al matrix,matrix-particle binding interface and SiC particle damage failure were defined in the model.The results show that the formation and propagation of cracks at the binding interface of the Al matrix and SiC particles or in the Al matrix are the main causes of chips fracture,and also the main factors affecting chips shape.There are damage forms such as complete fracture,local fragmentation,overall pull-out and local debonding of SiC particles,and corresponding defects such as scratches,pits,holes and protrusions occur on the machined surface or subsurface.The higher the elliptical particle center position is relative to the cutting path,the easier it is to debond,and the smaller the machined surface defects are.When the inclination angle of elliptical particles(the angle between the long axis of particles and the cutting direction)is 135°,the particle damage is the highest and the machined surface defects are the largest.The study of chips formation and particle damage is an effective way to understand the machining characteristics of SiCp/Al composites,it has reference value for optimizing the preparation process of SiCp/Al composites and improving the surface quality of SiCp/Al composites.

关 键 词：SICP/AL复合材料 有限元仿真 切屑形态 颗粒损伤形式 已加工表面质量 

分 类 号：TB333[一般工业技术—材料科学与工程] TG501.1[金属学及工艺—金属切削加工及机床]