Trial And Simulation Of Self-piercing Riveting Connection Technology Of Aluminum Alloy Body Structure

In the development of automobile industry,lightweight has gradually become a key technical to realize modern automobile energy saving and emission reduction,and has received widespread attention in the international community.Judging from the current specific situation,the rational use of aluminum alloy and high-strength steel body manufacturing concepts has been successfully promoted among some well-known automobile brands.Self-piercing riveting is a kind of connection method for aluminum alloy body applications.In the development of vehicle models,the structural strength and rationality of the aluminum alloy self-piercing riveting are often verified after the prototype completed.With the development of simulation technology,the application of simulation technology can verify the performance of the car body in the early stage of vehicle development.In order to strengthen the application of simulation analysis to this aspect,it is necessary to create a finite element discrete model to simulate self-piercing riveted joints.Taking the self-piercing willow joint made of aluminum alloy 6082-T6 as the research object,conduct multiple tests to research the tensile and shear performance of the joint,and then establish a simulation model in the finite element software to compare with the test conditions to determine the performance of a car body structure The discrete model of self-piercing riveted joint used for simulation.Finally,this model was applied to the simulation analysis of the stiffness performance of the body in white,and the validity of the model was proved through the actual vehicle test.The main contents of this paper are as follows:The self-piercing riveting process and working principle are studied,the application development trend of self-piercing riveting process in the development and design of automobile aluminum alloy body is studied,and the simulation model of self-piercing riveting is summarized through previous experience.Analyze the difficulties of self-piercing riveting in the application of body structure simulation.Through multiple sets of self-piercing riveting mechanical tests,the test process uses universal testing machine and non-contact strain gauge to test the mechanical characteristics of self-piercing riveted joints,using normal distribution method to count the test results,and analyze the thickness of self-piercing riveted substrates and the influence of the number of rivets,glue structure and arrangement frequency on self-piercing riveted joints.Using the simulation analysis method,four self-piercing riveting joint simulation methods are formulated in the simulation analysis software.The deformation mode,maximum tensile load,and maximum plastic strain in the tensile-shear condition comparison test are used to determine the self-piercing riveting model and the modeling method of the surrounding structure.Select a steel-aluminum hybrid body-in-white body of a certain vehicle model,establish a body-in-white finite element model in the Hyper Mesh software,and use the previously determined modeling method for the self-piercing riveting in the model,and then calculate the bending and torsional stiffness of the body structure for comparison and analysis of simulation and experiment to verify the validity of the model.Through self-piercing riveting joint mechanical test and simulation analysis research,a self-piercing riveting model for car body performance simulation is determined,and the modeling method is applied to the bending and torsional stiffness analysis of aluminum alloy car body.The test deviation is small,and it has the ability to guide the designer and development of simulation.