中文摘要：

为获得内燃机缸套-活塞环磨合磨损过程中微凸体的承载情况,利用粗糙峰的接触模型推导出磨合过程中微凸体承载方程,其中对弹性变形部分微凸体承载和塑性变形部分微凸体承载分别进行了研究,重点比较了内燃机缸套-活塞环磨合过程中假定接触微凸体全部为弹性变形与考虑接触微凸体产生弹、塑性变形时承载能力的不同.研究结果表明,在磨合磨损的中后期,即当h/σ大于0.5,ψ小于0.9时,两者差别不大,可以假定微凸体变形全部为弹性变形进行微凸体载荷的计算;而在磨合磨损初期,即当h/σ小于0.5,ψ大于0.9时,假定微凸体变形全部为弹性变形时的承载为考虑弹、塑性变形时的50%～85%左右.考虑到内燃机缸套-活塞环磨合过程中初期磨合的重要性,在计算缸套-活塞环磨合过程中微凸体承载时,应将塑性变形部分微凸体和弹性变形部分微凸体承载分别进行研究.也说明了本文所建立的微凸体承载方程更有益于缸套-活塞环磨合过程的摩擦学状态分析.

英文摘要：

In order to compute the load capacity of asperities for piston ring-cylinder liner in internal combustion engine at running-in stage,the load capacity equation of asperities,including load capacity of elastic deformation and plastic deformation asperities,was derived from the contact model of rough surfaces. And the equation was compared with the load capacity equation traditionally with the assumption that all of the contact asperities have elastic deformation. The results showed that,the load capacity of contact asperities can be calculated with the assumption that all of the contact asperities have elastic deformation in the middle or later running-in stage when h/σ0.5 and ψ0.9. While at the initial running-in stage when h/σ〉0.5 and ψ 〈0.9,the load capacity of contact asperities with the assumption that all of the contact asperities had elastic deformation was about 50%-85% of the situation that the contact asperities had elastic as well as plastic deformation. In the light of the importance of the initial stage during running-in for piston ring-cylinder liner,the load capacity of elastic deformation and plastic deformation asperities should be studied independently when calculated the load capacity of asperities,which showed that the established equation could be more accurate for tribological conditions analysis of piston ring-cylinder liner during running-in.