Research On Intermittent Fault Of Electrical Connector Under Temperature Stress

Widely applied to the various kinds of electronic and electrical equipment,the electric connector plays the role of mechanical connection and electrical connection.When the electrical connector breaks down intermittently,the failure is difficult to be reduplicated and the maintenance has nowhere to start,which poses severe challenge to the equipment availability and success probability of mission.Domestic and international studies show that temperature environment is an important cause of intermittent fault of electric connector,but its mechanism remains unclear.Therefore,it is a key problem demanding prompt solution to deeply analyze the intermittent fault mechanism of electric connector in the temperature environment.Aiming at this problem,the paper adopts the technological approaches of theoretical analysis,simulation analysis and experimental verification,and implements the in-depth study on the mechanism of intermittent fault of electrical connector under the effect of temperature stress.Specifically,the research contents of the paper include three aspects below:I.Theoretical analysis of intermittent fault mechanism of electrical connector under temperature stressStarting from the concept and connotation of Intermittent Fault of Electric Connector,the paper qualitatively analyzes the influence of temperature stress on the contact resistance of electric connector.The Level 3 Contact Contraction Model(macro to micro)of the contact resistance of electric connector is proposed in the paper,in which the correlation between temperature stress and the electric connector is identified.In addition,the paper constructs the three-dimensional coupling relation model of "contact damage--temperature stress--intermittent fault" of the electric connector,and macroscopically depicts the correlation among the contact damage,intermittent fault symptoms and level of external temperature stress of the electric connector.II.Simulation analysis of the impact mechanism of temperature stress on contact resistance of electrical connectorWith the aid of the finite element software of COMSOL,the paper sets up the finite element simulation model of rectangular and circular electric connector.Subsequently,the paper makes the simulation analysis of contact resistance of the electrical connectors of different material parameters different and different size parameters under the different levels of temperature stress,from which the change laws of the temperature-stress distribution and the contact resistance of electric connector in all kinds of situations are derived.III.Experimental verification of intermittent fault mechanism of electrical connector under temperature stressThe model selection analysis of the experimental samples of electric connector is conducted,in which the paper designs the stress section for the experiment on intermittent fault mechanism of electrical connector under temperature stress and built the experiment table.Then,the paper carries out the stress test of electric connector of different material parameters different and different size parameters under the different levels of temperature stress.By analyzing the experimental data,the paper verifies the theory of temperature stress on the intermittent fault mechanism of electric connector and the simulation analysis results.To sum up,from the perspectives of theoretical analysis,simulation analysis and experimental verification,the paper probes into the mechanism of electrical connector under the action of the temperature stress.It lays the theoretical foundation for the prevention,diagnosis and recognition of intermittent fault of electric connector in the project.