基于材料热参数的摩擦表面接触形变模型  

Friction Surface Contact Deformation Model Based on Material Thermal Parameters

作　　者：卢艳[1] 刘佐民[1] 

机构地区：[1]武汉理工大学摩擦学研究所,武汉430070

出　　处：《机械工程学报》2010年第9期120-125,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50775168)

摘　　要：基于材料热参数对摩擦表面热弹性和热膨胀产生的互逆变形原理,运用Hertz理论和材料本构关系推导出了描述摩擦表面接触变形的理论模型;利用Voss提出的连续随机相加算法思想,模拟分形布朗运动以建立工程粗糙表面;并将模拟表面与理论模型相结合,实现了热参数对摩擦表面粗糙度演变规律的描述。研究表明,摩擦表面的接触形变与其材料的热参数相关;实例分析表明,材料热参数对摩擦表面粗糙度的影响很大,且不同热参数的影响程度不同,从各个参数变化与工程表面的粗糙度变化曲线可以看出,热参数中除热导率与粗糙度变化呈现反比例非线性关系外,其他热参数的变化与粗糙度的变化趋势一致,但是变化曲率的大小有所不同;显然,这种影响程度可用来描述不同材料在摩擦过程中的表面粗糙度动态演变过程。Based on the reciprocal law of thermal elastic and thermal expansive deformation caused by thermal parameters, the theoretical model of friction surface contact deformation is deduced. The idea of random combined algorithm proposed by Voss is used to establish the engineering rough surface by simulating the fractal Brownian motion. The simulated surface is combined with the theoretical model to describe the evolution rule of friction surface roughness. The research indicates that there is correlation between the contact deformation and thermal parameters; the case analysis reveals that the thermal parameters have dramatic effects on friction surface roughness and the degrees of effects of different thermal parameters are different. It can be seen from the curve of relationship between the parameter variation and the engineering surface roughness variation. In the thermal parameters, except that there is nonlinear relationship of inverse proportion between the thermal conductivity and the roughness variation, the variation of other thermal parameters is consistent with the variation trend of roughness, but the variation curvatures are of different sizes. Obviously, the degree of effect can be used to describe the dynamic evolution process of surface roughness of different materials in a tribological process.

关 键 词：热参数 接触模型 摩擦表面 分形模型 

分 类 号：TH161[机械工程—机械制造及自动化]