Research On Accelerated Life Test Of Electrical Connectors Under Environment Multiple 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 and the date drawing from test experiment was treated.First, 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.Second, 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.Third, proposed and researched optimizing design mode of constant stress accelerated life test plans under the temperature and vibration stresses. According to this mode, under the temperature and vibration stresses, and combining with uniformly orthogonal design theory, and optimized the test plans of electrical connector. The result shows that, through optimizing test plan under the condition of estimate precision keeping fixed, the times of test and corresponding number of specimens may be reduced, thus, the time may be shortened and test cost reduced greatly. By this means, product reliability level may be evaluated quickly.Fourth, proposed and researched the evaluation method of accelerated life test plans by simulation. On the basis of simulating evaluation to various electrical 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.Fifth, through statistical analysis of electrical connector accelerated life test data, verified that the reliability statistical model of electrical connector is correct. Then, took least squares estimator of test data as preliminary estimate, applied versatile maximum likelihood estimate method to treat test data, obtained the estimators of electrical connector reliability characteristic values.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.