Elasto-plastic analysis of the contact region between a rigid ellipsoid and a semi-flat surface
Elasto-plastic analysis of the contact region between a rigid ellipsoid and a semi-flat surface
复制标题
刚性椭球与半平面接触区域的弹塑性分析
DOI：
10.1177/1687814018797397
复制
发表时间：
2018
影响因子：
2.1
通讯作者：
Hua Dengxin
中科院分区：
文献类型：
--
作者：
Li Pengyang;Zhou Lingxia;Cui Fangyuan;Wang Qu;ai;Guo Meiling;Zhai Yanfei;Li Yan;Hua Dengxin
当作用在机械结构上的载荷大于材料的屈服强度时，接触面将发生塑性变形。累积塑性变形对机械零件的寿命有重要影响。本文建立了基于共轭梯度法和快速傅立叶变换算法的三维半解析模型，研究了刚性椭球体与弹塑性半空间接触区域的特征参数。此外，还考虑了法向力和切向牵引力，以及不同滑动速度和摩擦系数产生的接触压力。接触压力、有效塑性应变、von Mises应力和残余应力随滑动速度的增加而增大。最后，当摩擦系数、接触压力和有效塑性应变增大时，von Mises应力增大，而残余应力减小。
When the load acting on a mechanical structure is greater than the yield strength of the material, the contact surface will undergo plastic deformation. Cumulative plastic deformation has an important influence on the lifespan of mechanical parts. This article presents a three-dimensional semi-analytical model based on the conjugate gradient method and fast Fourier transform algorithm, with the aim of studying the characteristic parameters of the contact region between a rigid ellipsoid and elasto-plastic half-space. Moreover, normal forces and tangential traction were considered, as well as the contact pressure resulting from various sliding speeds and friction coefficients. The contact pressure, effective plastic strain, von Mises stress, and residual stress were measured and shown to increase with increasing sliding velocity. Finally, when the friction coefficient, contact pressure, and effective plastic strain are increased, the von Mises stress is also shown to increase, whereas the residual stress decreases.