Mechanical and Thermomechanical Elastic-Plastic Contact Analysis of Layered Media With Patterned Surfaces
Mechanical and Thermomechanical Elastic-Plastic Contact Analysis of Layered Media With Patterned Surfaces
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DOI：
10.1115/1.1609487
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发表时间：
2004
影响因子：
2.5
通讯作者：
Z.-Q. Gong;K. Komvopoulos
中科院分区：
文献类型：
--
作者：
Z.-Q. Gong;K. Komvopoulos
用弹塑性有限元方法分析了球体与层状介质的法向接触和滑动接触，分析了图形几何形状对接触压力分布和次表面应力应变场的影响。对压痕球体的横向位移进行了三维滑动模拟，其位移大约等于衬垫空间周期的两倍。模拟了刚性球体的三个完整加载循环，包括压痕、滑动和卸载，以评估重复滑动对第一(硬)层应力和底层(软)层塑性变形的影响。对具有图案表面的弹塑性层状介质和与第一层特性相同的弹塑性球体进行了热机械滑动接触模拟，以考察摩擦加热对介质变形行为的影响。给出了表面的温度分布和最大温度变化以及以Peclet数表示的亚表面塑性演化的结果。用层状介质中温度梯度引起的温度拉应力解释了滑动过程中微接触尾迹产生热裂纹的可能性。
An elastic-plastic finite element analysis of a sphere in normal and sliding contact with a layered medium possessing a patterned surface with regularly spaced rectangular pads was conducted in order to investigate the effect of pattern geometry on the contact pressure distribution and subsurface stress-strain field. Three-dimensional sliding simulations were performed for lateral displacement of the indenting sphere approximately equal to two times the pad spatial periodicity. Three complete loading cycles, involving indentation, sliding, and unloading of a rigid sphere, were simulated to assess the effect of repeated sliding on the stresses in the first (hard) layer and plastic deformation in the underlying (soft) layer Thermomechanical sliding contact simulations of an elastic-plastic layered medium with a patterned surface and an elastic-plastic sphere with properties identical to those of the first layer were carried out to examine the effect of frictional heating on the deformation behavior of the medium. Results are presented for the temperature distribution and maximum temperature variation at the surface and the evolution of subsurface plasticity in terms of Peclet number The likelihood of thermal cracking in the wake of microcontacts during sliding is interpreted in the context of the thermal tensile stress due to the temperature gradients in the layered medium.