Multi-physics Coupling Analysis And Thermo-Mechanical Fatigue Life Prediction Of USB3.0 Electrical Connector

With the promotion and popularization of 5G communication technology and Internet of Things technology,as an important component of electronic equipment and important transmission of electrical signals,the failure mechanism analysis and reliability research of electrical connectors are of great significance.In this paper,the USB3.0 electrical connector as the object of study,the multi-physics coupling of the electrical connector is analyzed and simulated,the electrical contact failure mechanism of the electrical connector is introduced and analyzed,and the thermo-mechanical fatigue of the electrical connector is studied and the life prediction is made Its main content includes the following aspects:First,this paper deals with the multi-physics coupling of electrical connectors.The finite element equations for solving the physical parameters in the physical field are established.The coupling relationship between the electric field,the temperature field and the structure field of the electrical connector in the working state is analyzed.The coupling mathematical model of the multi-physical field of the electrical connector is also established.And the mechanism of electrical contact failure of multi-physics coupling of electrical connector is described.Secondly,the multi-physics coupling simulation of electrical connectors is presented in this paper.The structure simulation model of USB3.0 electrical connector is established.An electro-thermal-force multi-physics coupling simulation of the electrical connector is carried out,and the changes of the temperature field and the structure field of the electrical connector after the current conduction are analyzed.A thermal cycling simulation of the electrical connector is carried out,and the stress and strain of the metal pin of the electrical connector under the periodic temperature change are studied.Based on the simulation results of multi-physics coupling of USB3.0 electrical connector,the mechanism of electrical contact failure of USB3.0 electrical connector is analyzed.Finally,this paper studies the thermo-mechanical fatigue of electrical connectors.The characteristics of fatigue damage,low cycle fatigue and thermo-mechanical fatigue are described.Several fatigue damage theories commonly used in engineering are analyzed,and the application of bilinear damage theory is used to analyze the development law of thermo-mechanical fatigue of electrical connectors.Several commonly used thermo-mechanical fatigue life prediction models are introduced,and their advantages and disadvantages are analyzed.Based on the strain results of the metal Pin in the thermal cycle simulation results of the electrical connector,the thermal fatigue life of the USB3.0 electrical connector is predicted by the Manson-Coffin fatigue life prediction formula.