磨粒微观滑动接触过程热效应的有限元分析

Heat Analysis of Sliding Abrasive Particle Micro Contact Process by Finite Element Method

利用ANSYS有限元软件分析了磨粒与被磨损材料表面滑动接触过程中,在摩擦热和力场的耦合作用下,接触区表现出的局部温度变化、应力变化等特性。结果表明,在磨粒滑移过程中,磨粒相当于接受固定热源作用,接触区温度逐渐上升,温度存在起伏波动现象,瞬现温升最高点在磨粒接触区两侧,反映出接触状态的不连续性,接触区状态的非稳定性;被磨材料表面的各点在进入接触前、经历接触时、脱离接触时,接触区温度存在先升高再下降的变化过程,同时,接触区的应力、剪应力、接触压力也发生变化。磨粒滑动过程的热效应问题研究将有助于揭示接触过程中材料表面损伤机制。

The characters of temperature, contact pressure and friction shearing stress in contact area under the couple effect of friction heating and force during abrasive particles sliding on the frictional surface were studied by using ANSYS software. It is shown that in the abrasive particle sliding process, the particle surface is similar to get steady heat resource, and the temperature of contact surface rises step by step and fluctuates according to the sliding time, and the maximum temperature is in the two sides of the particles in contact area, which reveals that the contact stages are discontinuous and unstable. The temperature of the surface on which abrasive particle is sliding rises and then falls, and the stress, shear and contact press are also changed. The research on heating analysis of particle sliding process will be helpful to expose the mechanism of the surface damage.