考虑收口量的接触件可靠性建模与试验分析

Reliability Modeling and Test Analysis of Contact Parts Considering Closure Volume

针对贮存状态下不同开槽收口量接触件的可靠性评估问题,通过对接触件在贮存状态下的失效机理分析,揭示了接触件发生失效主要是由接触表面氧化腐蚀物堆积引起膜层电阻增大所导致,构建了开槽收口量与接触压力之间的数学关系;基于电接触理论,以接触电阻为性能指标,建立接触件关于接触压力的可靠性统计模型;通过开展加速退化试验,对试验数据进行分析与评估;基于最小二乘估计与极大似然估计两步法,对模型进行了参数估计及验证,并根据试验数据评估了不同收口量下接触件的贮存寿命及其可靠度,结果表明:接触件收口量越大其贮存可靠性越好,为不同开槽收口量接触件的贮存可靠性评估提供了理论基础。

Aiming at the reliability evaluation problem of contact parts with different slotted closing quantity under storage condition, through the failure mechanism analysis of contact parts under storage condition, it is revealed that the failure of contact parts is mainly caused by the increase of film re-sistance caused by the accumulation of oxide corrosion substances on the contact surface, and the mathematical relationship between the slotted closing quantity and contact pressure is established. Based on the electrical contact theory and taking the contact resistance as the performance index, the reliability statistical model of contact pressure was established. By conducting accelerated deg-radation test, the test data are analyzed and evaluated. Based on the two-step method of least square estimation and maximum likelihood estimation, the parameters of the model were esti-mated and verified. According to the test data, the storage life and reliability of the contact parts under different closing quantity were evaluated. The results show that the larger the closing quan-tity of the contact parts, the better the storage reliability, which provides a theoretical basis for the storage reliability evaluation of the contact parts with different opening quantity.