【摘要】 针对某柴油机活塞顶裙结合面上出现的微动磨损现象，基于活塞顶和裙部实际关键几何特征，建立活塞顶裙有限元模型，研究法向载荷与位移幅值对磨损过程和结果的影响。基于Archard磨损模型计算磨损量，利用ABAQUS软件的ALE功能和UMESHMOTION子程序模拟磨损过程，对比模拟结果与试验数据，验证数值模型的精确性和可靠性。结果显示：完全滑移条件下，位移幅值固定时，法向载荷越低(30 N),磨损深度越大；载荷越高(70 N),磨损深度减小但分布不均。法向载荷固定时，位移幅值增加会显著加剧磨损，但导致接触应力分布更不均匀，边缘应力集中加剧。综合磨损形貌及应力分析可知：位移幅值是影响磨损深度的主导因素，而法向载荷对接触应力的调控作用更显著。更多还原

【Abstract】 To address the fretting wear at the junction surface between the top and skirt of a diesel engine piston as well as to investigate the influence of normal load and displacement amplitude on the wear process and its outcomes, a finite element model is developed based on the actual key geometric features of both components. First, the wear volume is calculated utilizing the archard wear model. The wear process is simulated with ABAQUS software’s ALE function and UMESHMOTION subroutine. Then, the accuracy and reliability of the numerical model are verified by comparing simulation results with experimental data. Analysis results reveal, under complete sliding conditions with a fixed displacement amplitude, a lower normal load(30 N) produces greater wear depth. Conversely, at a higher load(70 N), although the wear depth decreases, its distribution becomes uneven. When the normal load is fixed, an increase in displacement amplitude markedly aggravates wear but also leads to a more uneven contact stress distribution and heightened edge stress concentration. Based on the comprehensive analysis of wear morphology and stress, it is concluded that displacement amplitude serves as the primary factor influencing wear depth, while normal load plays a more significant role in regulating contact stress.更多还原