电连接器接触件微动磨损有限元仿真分析

航空电连接器在服役过程中受到振动、冲击或温度变化等外界激励时,内部的接触件可能会发生微动磨损,导致接触界面的匹配状态发生变化,影响信号和功率传输。基于 Archard模型,对接触件微动磨损行为进行了理论分析和有限元仿真分析。通过对某微动磨损试验的数据进行分析,计算了镀金铜合金的磨损系数,并用于微动磨损仿真当中。通过仿真分析,得到了表面接触在不同微动周期的状态变化规律、变形和应力分布情况,发现接触区域表面和近表面的中心位置有明显的应力集中现象,接触状态在第 1∕4和 3∕4周期之后,会由滑动接触转变为黏着接触,状态的变化具有迟滞效应,微动磨损量随着微动距离的增加而线性变化。

Finite Element Simulation Analysis of Fretting Wear of Aviation Electrical Connector Contacts

When the aviation electrical connector is stimulated by vibration, impact or temperature change in service, fret.ting wear may occur in the internal contacts, resulting in the change of the matching state of the contact interface, affectingthe signal and power transmission. Based on Archard model, the fretting wear behavior of the contact is analyzed theoreti.cally and by finite element simulation. Based on the analysis of fretting wear test data, the wear coefficient of the gold-plat.ed copper alloy is calculated and used in fretting wear simulation. Through the simulation analysis, the state variation ofsurface contact in different fretting periods, deformation and stress distribution are obtained, the obvious stress concentra.tion at the center of the surface and near surface of the contact area is found, the contact state changes from sliding contactto adhesive contact after the first-quarter and third-quarter cycle, and the change of state has a hysteresis effect, and thevalue of fretting wear increases linearly with fretting distance.