摘要
磨损伴随在机械零部件的整个服役期内,对其寿命产生很大的影响.由于磨损是一个动态复杂的过程,现有的磨损研究主要集中在实验研究,这必然会增加成本及产品设计周期.为此,文中提出了一种基于Archard模型的数值计算方法,并用该方法对线接触弹性磨损全过程进行数值分析,最终得到不同滑动距离下的法向接触压力及磨损深度变化图.整个分析过程分步进行,即每计算一步都会更新表面接触形状,直至求出最大滑动距离下的磨损量.计算结果表明,在有摩擦力作用的情况下,对于线接触,接触压力会相对于初始接触点出现偏移,且摩擦系数越大,偏移越明显,接触宽度也会略微增大;在磨损过程中,接触状态会由线接触向面接触转化,压力分布的不对称性会逐渐减小,最终趋于对称分布.实验结果表明,数值预测值与实验值相一致.
Wear exists in the whole service lifetime of mechanical parts and produces great impact on the lifetime of a machine. Current researches on wear mainly focus on experiments due to the dynamic complexity of wear process, which may increase the production cost and the product design cycle. In order to solve this problem, an Archard’ s model-based numerical method is proposed, which is used to numerically analyze the whole process of elastic wear in line contact and obtain the normal contact pressure as well as wear depth at different sliding distances. The simu-lation process is conducted step by step, i. e. , in each step, the surface contact topography is updated until the maximum sliding distance is achieved. Calculated results show that, for line contact, the contact pressure offsets with respect to the initial contact point at which friction force exists, and the offset becomes obvious as the friction coefficient increases, at the same time, the contact width increases slightly. Moreover, it is found that, in wear process, the contact state transfers from line contact to surface contact, and the asymmetry of contact pressure dis-tribution gradually diminishes till to a symmetrical state. Experimental results show that the numerical prediction values are consistent with the experimental ones.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第5期45-51,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51575190)~~
关键词
磨损
线接触
接触压力
奇异积分方程
接触形状
数值分析
wear
line contact
contact pressure
singular integral equation
contact topography
numerical analy-sis
