Mechanics and Material Interactions of Rolling and Sliding Contact Plasticity

之前在美国国家科学基金会资助的DMR-8418097项目中所做的工作涉及钢和其他材料中的滚动接触变形和断裂的分析。研究采用弹塑性有限元和循环塑性分析相结合的断裂力学方法。这些研究首次提供了基于循环本构关系的纯滚动和滚动/滑动摩擦接触的二维和三维分析。正在进行的工作寻求更全面地整合接触问题的力学和材料元素。文中将着重讨论这一问题的两个方面：一是对理想宏观接触的分析；二是微凸体、润滑压力尖峰和摩擦加热产生的“近表面”效应。这种方法可以适应材料行为的真实描述，并应该导致对接触变形、循环塑性流动和残余应力的有意义的估计。

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.