弹塑性粗糙表面实际接触面积演变规律研究

Study on the Evolution of Real Contact Area between Elastic-plastic Rough Surfaces

粗糙表面的实际接触面积直接影响精密机电设备配合表面的摩擦因数、热导/电导率、接触应力等。然而,针对弹塑性接触行为进行系统性地研究很少,弹塑性粗糙表面实际接触面积的演变规律尚不明确。针对这一问题,通过理论研究获得了弹塑性粗糙表面实际接触面积的影响因素,并引入弹塑性接触力学数值计算方法,对具有不同材料参数和表面形貌特征的弹塑性粗糙表面的接触行为进行数值仿真计算,得到各种情况下的表面实际接触面积随着平均接触压力的变化曲线,总结出了实际接触面积演变规律与这些影响因素之间的映射关系,并最终得到实际接触面积的计算公式,为弹塑性接触力学的相关工程应用奠定了基础。

The real contact area of elastic-plastic rough surfaces significantly affects the friction coefficient, the thermal/electrical conductivity, and the contact stress of the assembly surfaces of precision electromechanical devices. However, as far as the authors known, the elastic-plastic contact behavior is rarely studied systematically, and the evolution of the real contact area has not been investigated. To solve this problem, the factors affecting the real contact area of elastic-plastic rough surfaces are revealed by theoretical research. Based on this, the contact behavior of various elastic-plastic rough surfaces with different material and surface topography is numerically studied, and real contact area versus average contact pressure curves are obtained. With these results, the quantitative relationship between the evolution of the real contact area and the factors is presented, which will provide fundamental theory for scientists and engineers working in this field.