关键词: 电连接器, 微动磨损, 磨屑, 性能退化, 超声无损检测

Abstract: Aiming at the problems that electrical connectors reducing contact performance by fretting wear in vibration environments， an ultrasonic testing method was used to monitor the characteristic values of wear debris between electrical connector contacts during fretting wear， and to study the wear degree of contacts under different vibration conditions and the degradation law of contact performance. The results show that the vibration frequency， vibration acceleration， and fretting times have positive cumulative effects on the debris accumulation and contact resistance fluctuation. When the electrical connector vibrates axially， the debris accumulation effectiveness is the most obvious. The contact resistance and the total amount of wear debris characteristic values show a very high correlation under high vibration frequency and acceleration. The average absolute errors of SSA-BP performance degradation model are less than 5% based on the wear debris characteristic values. 

Key words: electrical connector, fretting wear, wear debris, performance degradation, ultrasonic nondestructive testing