磨粒磨损的磨粒接触热分析

Thermal Analysis of Debris Contact in Abrasive Wear

针对磨粒磨损机制,采用球形磨粒模型和分形磨粒2种模型,利用有限元软件ANSYS分析磨粒磨损的滑动过程,探讨磨粒与磨损表面接触区內的温度变化、热应力分布及其随表层深度的变化情况,并对2种模型的分析结果进行对比分析。研究结果表明:球形磨粒模型中磨粒温度较高,接触体温度较低,磨粒与磨损表面温差较大,磨粒与表面接触处的Mises应力和剪应力分布比较分散;而分形磨粒模型中接触体温度较低,磨粒温度更低,磨粒与磨损表面温差较小,磨粒与表面接触处的Mises应力和剪应力分布比较集中,并且应力最大值比球形磨粒模型的大。

For the mechanism of abrasive wear,the wear debris was modeled with both spherical and the likely fractal debris.For the sliding process of abrasive wear,the temperature variation and thermal stress distribution and its changes with the substrate depth were studied with the finite element software ANSYS.The results of the two models were comparatively studied.The results demonstrate that,in the spherical model,the temperature of spherical debris is higher,and the temperature of the contact body is remarkably lower than the former.The distributions of Mises stress and shear stress in the contact zone between the debris and the contact surface widely span in the two substrates.However,in the fractal model,the temperature of the contact body is lower,and the temperature of fractal debris is far lower than the former,and the distributions of Mises stress and shear stress at the contact area between the debris and the contact surface are more concentrated,and the corresponding maximum stress is higher than that of the spherical debris model.