Mechanics and Material Interactions of Rolling and Sliding Contact Plasticity

以前在NSF资助下完成的这项工作 DMR-8418097涉及滚动接触分析 钢和其他材料的变形和断裂。 的 弹塑性有限元与循环荷载联合研究 塑性分析使用断裂力学方法。的 研究首次提供了二维和三维- 循环本构量纲分析 纯滚动和滚动/滑动摩擦关系 contact.正在进行的工作力求更全面地整合 接触问题的力学和材料要素。两 这一问题的几个方面将被强调：一是分析 另一种是“近表面” 微凸体、润滑压力峰值产生的影响 和摩擦加热。这种方法可以适应现实的 描述材料行为，并应导致有意义的 接触变形、循环塑性流动和 残余应力

Previous work done on this program under NSF grant DMR-8418097 dealt with the analysis of rolling contact deformation and fracture in steels and other materials. The investigation combined elasto-plastic finite element and cyclic plasticity analyses using a fracture mechanics approach. The studies provided, for the first time, two-dimensional and three- dimensional analyses based on cyclic constitutive relationships for pure rolling and rolling/sliding friction contact. The ongoing work seeks to more completely integrate the mechanics and materials elements of the contact problem. Two aspects of this problem will be emphasized: one is the analysis of the idealized macrocontact; the other is the "near surface" effects produced by microasperities, lubrication pressure spikes and frictional heating. This approach can accommodate realistic descriptions of material behavior and should lead to meaningful estimates of the contact distortions, cyclic plastic flow and residual stresses.