Research On Electrical Connector Reliability Test Plan Under Environment Stresses

In this dissertation, the model Y11X-1419 electrical connector as the object, under temperature and vibration stresses, the failure mechanism has been analyzed, the Reliability Model has been built. Based on above, the Reliability Test Method of electrical connectors has been deeply researched.Firstly, briefly stated the developing history and current situation of Reliability Engineering, introduce the Reliability Test Method and developing trends. Moreover, the statistical analysis method and existing problems, electrical connectors reliability research's current situation and existing problems, and reliability test plan and existing problems was presentation.Secondly, through analyzing the failure instance of electrical connectors, educed the four main modes of failure of electrical connectors, and make Faulity-Tree Analyze. It is educed that contact fault was a main mode of failure of electrical connectors, and the two main factors which affect the contact fault are temperature and vibration stress. The failure mechanism of electrical connectors under the two stresses is discussed.Thirdly, through analyzing the relation between the temperature and vibration stress and the life of connector, And combining with the theory of probability and statistics, deduce the failure physics equation, and set up a reliability statistical model. Laid a foundation for working out electrical connector reliability test plans and treating electrical connectors test data.Fourthly, proposed and researched optimizing design mode of constant stress accelerated life test plans under the temperature and vibration stresses. Four stresses levers are achieved through optimizing design under surrounding temperature or vibration stress alone affected.Fifthly, using uniformly orthogonal design theory to arrange the four-lever temperatures and four-lever vibration stress, catch an excellent accelerated life text plan, which make the estimate value have the well precision in normal stress lever, at the same time that can reduce the sample number and shorten the test time.Sixthly, proposed and researched the evaluation method of accelerated life test plans by simulation. Through comparing and simulation the uniformly orthogonal design plan and total test plan, in order to prove that the uniformly orthogonal design plan is feasible.Eventually, gave a conclusion to research content of entire dissertation, and proposed the research content of the reliability test and analysis of electrical connectors, and the research direction of this Foundation project.