考虑材料塑性流动的粗糙表面弹塑性接触建模  

Elastic-plastic contact modeling of rough surfaces considering material plastic flow

作　　者：周炜 蔡一丁 肖罡 杨钦文[3] 唐进元[4] ZHOU Wei;CAI Yi-ding;XIAO Gang;YANG Qin-wen;TANG Jin-yuan(Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material,Hunan University of Science and Technology,Xiangtan 411201,China;Jiangxi Copper Technology Research Institute Co.,Ltd.,Nanchang 330096,China;School of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China;College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]湖南科技大学难加工材料高效精密加工湖南省重点实验室,湖南湘潭411201 [2]江西铜业技术研究院有限公司,江西南昌330096 [3]湖南大学机械与运载工程学院,湖南长沙410082 [4]中南大学机电工程学院,湖南长沙410083

出　　处：《塑性工程学报》2024年第4期178-183,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52075159);江西省自然科学基金杰出青年基金资助项目(20224ACB218002);江西省高层次高技能领军人才培养工程资助项目;湖南省自然科学基金资助项目(2022JJ30019);广西大学省部共建特色金属材料与组合结构全寿命安全国家重点实验室开放基金资助项目(2022GXYSOF24)。

摘　　要：针对粗糙表面弹塑性接触问题,考虑微凸体顶端因接触变形产生的材料塑性流动,从塑性变形体积守恒准则出发,将相邻接触单元划分为不同类型接触片段,对不同类型接触片段分别提出了材料塑性流动模式与算法,建立了表面微观形貌循环更新的弹塑性接触模型。通过与Hertz解和有限元解进行对比,检验了所提模型的有效性。应用所提模型开展粗糙表面弹塑性接触分析,获得了表面微观形貌和接触压力演化过程。结果表明:所提模型与Hertz解和有限元解基本相符,最大误差在10%以内;材料塑性流动使得材料由峰顶逐渐向峰谷转移,导致接触范围随之变大,平均接触压力随之减小,但转变速度逐渐趋缓。To solve the elastic-plastic contact problem of rough surface,considering the plastic flow of the materials caused by contact de-formation at the top of micro-convex body,starting from the criterion of plastic deformation volume conservation,the adjacent contact ele-ments were divided into different types of contact segments.The plastic flow modes and algorithms of the materials for different contact segments were proposed,respectively,and an elastoplastic contact model with cyclic updating of surface micro-morphology was estab-lished.The effectiveness of the proposed model was verified by comparison with Hertz solution and finite element solution.The elastic-plastic contact analysis of rough surfaces was carried out by the proposed model,and the surface morphology and contact pressure evolution process were obtained.The results show that the proposed model is basically consistent with Hertz solution and finite element solution,and the maximum error is less than 10%.The plastic flow of the materials causes the materials to gradually transfer from the peak to the peak valley,resulting in a larger contact range and a smaller average contact pressure,but the transition speed gradually slows down.

关 键 词：粗糙表面 弹塑性 接触 微观形貌 

分 类 号：TH117[机械工程—机械设计及理论]