圆柱平面微动磨损接触状态有限元分析

Finite element analysis of fretting contact state of cylindrical-plane fretting wear

大多数针对微动磨损的研究主要关注的是具体材料的磨损特性,而对微动接触状态下的应力场分布及其影响因素研究较少。然而,微动接触区的应力场分布却直接决定着接触区材料的磨损行为。针对微动磨损过程中关键微动参数对接触状态的影响问题,对微动磨损接触状态进行了有限元分析。首先,采用Abaqus软件建立了圆柱-平面微动接触有限元模型,并对其关键微动参数的选取进行了分组规划,确定了具体的加载过程;然后,利用解析法验证了有限元模型的准确性,并对圆柱平面微动接触有限元模型的接触状态进行了有限元仿真;最后,根据仿真结果,分析讨论了法向载荷、位移幅值和摩擦因数等参数对接触区应力场分布规律和接触状态的影响。研究结果表明:法向载荷主要决定接触区接触宽度和切应力范围,摩擦因数主要影响局部滑移与全局滑移之间的界限范围,位移幅值决定着试件与微动垫的接触状态,在上述各因素中,位移幅值是主要的影响因素;在多个变量的共同作用下,微动接触表现出不同的摩擦学行为,从而影响了微动磨损机制。

Most researches on fretting wear mainly focus on the wear characteristics of specific materials,while the research on the distribution of stress field and its influencing factors in fretting contact state is less.However,the distribution of the stress field in the fretting contact area directly determines the wear behavior of the materials in the contact area.Aiming at the problem of the influence of key fretting parameters on the contact state during fretting wear,the contact state of fretting wear was studied.Firstly,the finite element model of cylinder-plane fretting contact was established using Abaqus software,and the selection of key fretting parameters was planned in groups,and the specific loading process was determined.Secondly,the accuracy of the finite element model was verified by the analytical method,and the contact state of the cylinder-plane fretting contact finite element model was simulated by finite element method.Finally,according to the simulation results,the effects of normal load,displacement amplitude and friction factor on the stress field distribution and contact state in the contact area were analyzed and discussed.The results show that the normal load mainly determines the contact width and the range of shear stress in the contact area,the friction factor mainly affects the boundary between partial slip regime(PSR)and gross slip regime(GSR),and the displacement amplitude determines the contact state between the specimen and the fretting pad.Among the above factors,the displacement amplitude is the main influencing factor.Under the joint action of multiple variables,the fretting contact exhibits different tribological behaviors and thus affects the fretting wear mechanism.