Study On Reliability Modeling And Test Evaluation Of G100 Silicone Rubber Insulator For Electrical Connectors

Electrical connector is an important part of various types of equipment and electronic systems.The reliability of its connection directly affects the performance and safety of equipment.Insulator is one of the indispensable components of the electrical connector.If it is faulty or damaged,it may not only lead to safety problems such as short circuit and electric leakage,but also cause serious consequences such as fire.Therefore,the reliability and stability of electrical connector insulation is very important to the safety of the circuit.However,the current research on electrical connectors mainly focuses on the contact performance,while the research on insulation performance mainly analyzes its change rule qualitatively from the data level,and lacks quantitative research from the mechanism level.Therefore,this paper takes a certain type of electrical connector as an example to conduct an in-depth study on reliability modeling and test evaluation of G100 silicone rubber insulator parts used in electrical connectors.The specific research content is as follows:(1)Through the analysis of the storage environment effect and insulation failure mechanism of electrical connectors,it is determined that temperature and humidity are the key factors affecting the performance degradation of G100 silicone rubber insulator parts used for electrical connectors.The internal mechanism of the degradation of G100 silicone rubber insulator was revealed,that is,under the action of temperature and humidity,G100 silicone rubber would undergo thermal oxygen aging and hydrolysis reaction,which together lead to the increase of carrier concentration and finally lead to the decrease of insulation resistance.(2)According to the failure mechanism of G100 silicone rubber insulating parts used for electric connectors,based on the conductivity mechanism of dielectric and mass action law,the mathematical expression between the carrier concentration and temperature and humidity of G100 silicone rubber insulating parts was established.Based on the expression of insulation resistance of electrical connectors,the accelerated degradation model of insulation properties of G100 silicone rubber insulator with stress and time was established.According to the characteristics of electrical structure of electric connector,the life distribution model of G100 silicone rubber insulator for electric connector is established.(3)The accelerated degradation test scheme of G100 silicone rubber insulator parts was developed and the test was carried out to collect the accelerated degradation data.Based on least squares estimation and maximum likelihood estimation,the parameters of the accelerated degradation model are estimated by using the accelerated degradation data.Factor analysis was used to analyze the influence of temperature and humidity on the life of G100 silicone rubber insulating parts.The results show that the life of G100 silicone rubber insulating parts decreases with the increase of temperature and humidity stress level,and the influence of temperature on the life is greater than that of humidity.Finally,the reliable storage life of G100 silicone rubber insulator for electrical connectors is evaluated under normal stress level combination.(4)AD test was used to verify the hypothesis of insulation resistance and degradation rate distribution of G100 silicone rubber insulator.At the same time,goodness of fit test and Bartlett test were used to test the hypothesis of consistency of performance degradation trajectory model and failure mechanism respectively,and the correctness of the accelerated degradation model derived from the mechanism was verified.Scanning electron microscopy(SEM)and Fourier infrared spectroscopy(FTIR)were used to test the failure mechanism,and the rationality of failure mechanism analysis of G100 silicone rubber insulator in storage state was verified.