Simulation And Optimization Of Insertion And Extraction Force Of High-speed Backplane Connector And Fatigue Characteristics

With the rapid development of information society,the system for the signal transmission rate between the requirements are getting higher and higher.High-speed backplane connector as a new type of electrical connector,mainly in the high data transmission requirements of high-speed Internet systems are widely used.As a sophisticated component,the mechanical reliability of the pros and cons is directly related to the entire application system can be stable and reliable work.In this paper,the high-speed backplane connector with a transmission rate of 25 Gbps is taken as the research object.The research methods and achievements of the electrical connector insertion force and fatigue characteristics had been analyzed.In this paper,an analytical method including insertion force,mechanical life and thermal fatigue life is proposed in combination with the mechanical reliability under the condition of alternating operation and temperature alternation.The whole process of the process mainly uses finite element analysis and formula calculation method,Because the whole high-speed backplane connector has six wafers and the structure is relatively complicated,this paper first simplifies the whole model,established the single simulation model and the single-chip simulation model respectively,and used LS-DYNA to solve the whole nonlinear plug-The simulation results of the insertion force.The results show that the maximal insertion force is 0.280 N and the maximum pull-out force is 0.090 N in the single model,and the maximum insertion force of the male end is 0.348 N and 0.100 N respectively,and the correctness of the result is verified by the insertion force test The The maximum stress(1267Mpa)of the whole model occurs at the base bend,which exceeds the yield limit of the material itself and produces plastic deformation.According to the simulation results,the structure and assembly size of the model can be optimized,and the corresponding insertion force can be obtained under different structures,which can provide the basis for improving the mechanical reliability.Based on the simulation results of the plugin process,the secondary simulation of the nCode DesignLife analysis software was carried out,and the mechanical life of the high-speed backplane connector was analyzed by the low-cycle fatigue analysis method.The results show that the minimum lifetime(376)in the initial structure occurs at the head bending,which is also where the strain of the whole model is greatest.The analysis of low-cycle fatigue life is mainly based on the strain criterion.Any structural change that can affect the strain can affect the mechanical life.However,the structure change can also cause the change of the insertion force.Therefore,in the process of structural design,insertion force and mechanical life are the two factors.Based on the Manson-coffin formula of strain,this paper adopts the simplified method of double-logarithmic coordinates: four-point correlation method and general slope method,combined with the strain of high-speed backplane connector under Workbench under alternating temperature The thermal fatigue life of the data was calculated by two simplified methods,and the lifetime values were calculated at about 250 times.And by changing the temperature conditions to obtain the temperature range is the first factor affecting the thermal fatigue life,the average temperature for the second factor.