Reliability Statistical Model And Demonstration Of Electrical Connectors Under Multiple Stresses

In this master dissertation, took model Y11P-1419 electrical connector as the object, by analyzing the failure mechanism under temperature and vibration stresses, built the reliability model, and deeply researched demonstration of the model.Firstly, introduced the significance of reliability research, briefly stated the developing history and current situation of reliability engineering, introduced the methods and trends of reliability statistical analysis, and reviewed electrical connectors' current research situation and existing problems.Secondly, through analyzing the failure mechanism of electrical connectors under temperature and vibration stresses, educed the failure physics equation, made out the failure life distribution of electrical connectors, laid a foundation for working out electrical connectors' accelerated life test under multiple stresses.Thirdly, based on comparing several test design methods, determined the combined scheme of testing stresses by the uniformly test theory. On the principle of keeping the failure mechanism unchanged, after the accelerate goal was satisfied, proposed a testing plan. By using the Monte Carlo method, simulated and evaluated the uniform testing plan and comprehensive test plan by comparing their mean variances and standard distance values of estimated median lives, proved that the uniform testing plan is feasible.Fourthly, by using the probability paper and Van-Montfort method, it was demonstrated that the failure life distribution of electrical connectors is Weibull model. By making use of the maximum likelihood estimation, estimated the distribution parameters of the model under all stress levels, and verified that the accelerated life testing keeps the failure mechanism of the electrical connectors unchanged.Fifthly, after logarithms transition, the accelerated life equation is changed from Eyring-Weibull model to linear-Extreme model. By using least-square estimation, estimated the parameters of the linear model, based on analysis of variance, invoked significance testing of the regression equation and regression parameters, after analyzing the residual scatter chart, verified the reliability statistical model of electrical connectors is linear-Extreme model, finally, by using the model, assessed the reliability levels of the electrical connectors.Statistically analyzed electrical connectors' accelerated life test data and obtained the electrical connector reliability estimated characteristic values.Eventually, gave a conclusion of the research content of the entire master dissertation, and proposed the further research content of electrical connector reliability.