CFRP螺旋铣孔成屑机制的三维微观有限元仿真研究  

Three-dimensional Micro-scale Finite Element Simulation Study on Chip Formation Mechanism of CFRP Helical Milling

作　　者：周兰 李光奇 安国升[2] 王云龙 朱瑞彪 钟云 ZHOU Lan;LI Guangqi;AN Guosheng;WANG Yunlong;ZHU Ruibiao;ZHONG Yun(School of Electromechanical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;China National Nuclear Industry Corporation 404,Jiayuguan 732850,Gansu,China)

机构地区：[1]兰州理工大学机电工程学院,兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [3]中核四○四有限公司,甘肃嘉峪关732850

出　　处：《材料导报》2024年第24期284-290,共7页Materials Reports

基　　金：国家自然科学基金(52265049);甘肃省青年博士基金(2021QB-043)。

摘　　要：碳纤维增强树脂基复合材料(Carbon fiber reinforced plastic/polymer,CFRP)螺旋铣孔过程切削力变化、残余应力分布与断裂机制的宏观研究无法反映刀具与碳纤维增强相、基体与界面相之间相互作用的瞬态切削特性。本工作基于螺旋铣孔运动学原理,采用正交切削法构建CFRP螺旋铣孔切屑成形过程的三维微观有限元切削模型,通过分析CFRP不同纤维方向角θ(0°、45°、90°、135°)时、切削速度与切削厚度对切削力、残余应力以及纤维方向对断裂行为的影响规律,最后揭示CFRP螺旋铣孔的成屑机制。结果表明:θ=90°时,周向力不受切削速度、切削厚度的影响,其增值最大;当切削厚度相同时,θ=0°的周向力增值最小;当切削速度相同时,θ=45°的周向力增值最小。当θ为0°、45°、135°时,残余应力分布情况不受切削厚度的影响,θ为0°、135°分布在已加工表面,θ=45°集中分布在已加工表面下方;当θ=90°时,随着切削厚度的增大,残余应力分布扩展至整个工件。θ为0°、45°的CFRP断裂行为是剪切断裂和弯曲断裂共同作用的结果;θ=90°时,以剪切断裂为主;θ=135°时,以弯曲断裂为主。The instantaneous cutting characteristics of interactions between cutter and the carbon fiber reinforced phase,matrix and the interface phase can’t be reflected only by macro-scale studying of cutting force variation,residual stress distribution and fracture mechanism of carbon fiber reinforced plastic/polymer(CFRP)during helical milling process.In this work,based on the principle of helical milling kinematics,a three-dimensional micro-scale finite element cutting model of chip forming process in helical milling of CFRP was established by using the orthogonal cutting method.Analyzed the influence rules of cutting speed and cutting depth on cutting force,residual stress and fracture behavior of fiber orientation of CFRP with different fiber orientationsθ(0°,45°,90°,135°),finally revealed the chip formation mechanisms of helical milling for CFRP.The results showed that:whenθ=90°,the peripheral cutting force wasn’t affected by cutting speed and cutting depth with its maximum increment.when the cutting depth was constant,the minimum force increment was obtained withθ=0°;and when the cutting speed was constant,the minimum force increment was obtained withθ=45°.Whenθ=0°,45°and 135°,the residual stress wasn’t affected by the cutting depth,the resi-dual stress was distributed on the machined surface withθ=0°and 135°,whenθ=45°,the residual stress converged below the machined surface;whenθ=90°,the residual stress extended all the workpiece with the increase of cutting depth.The fracture behavior of CFRP withθ=0°and 45°was resulted from shear fracture and bend fracture;whenθ=90°andθ=135°,it was dominated by shear and bend fracture,respectively.

关 键 词：CFRP 螺旋铣 RVE模型 纤维方向角 θ 断裂行为 

分 类 号：TB332[一般工业技术—材料科学与工程]