缸套—活塞环磨合过程中微凸体承载的理论研究

为获得内燃机缸套—活塞环磨合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状态下微凸体承载方程,对弹性变形微凸体承载和塑性变形微凸体承载分别进行了研究,并对Gaussian分布下的微凸体承载方程进行了理论分析,重点讨论了内燃机缸套—活塞环磨合过程中塑性变形微凸体承载能力的变化。分析结果表明,磨合初期,塑性接触部分微凸体承载较大(占微凸体总承载的70%~80%);随着磨合的进行,塑性接触部分微凸体承载占微凸体总承载的比例逐渐减小,是一个动态变化的过程。所建立的微凸体承载方程为磨合过程的动力学建模及缸套—活塞环摩擦学状态分析提供了理论支撑。

Theoretical Study on Loading Capacity of Asperities during Cylinder Liner-piston Ring Running-in Process

In order to acquire the loading capacity of asperities during the cylinder liner-piston ring running-in process,the loading capacity of elastically deformed and plastically deformed asperities was researched with the load capacity equation that was derived from the asperity contact model.The equation under Gaussian distribution was analyzed theoretically,and the variety of loading capacity for plastically deformed asperities during the cylinder liner-piston ring running-in process was emphatically discussed.The results show that the plastically deformed asperities can bear the larger load at the beginning of running-in,which takes up about 70 percent to 80 percent of total loading capacity,and bear the smaller and smaller load with the proceeding of running-in,which is the dynamic change process.The established equation brings the theoretic supports for dynamics modeling and tribological state analysis of cylinder liner-piston ring during the running-in process.