Based On The Test And Simulation Of The Aluminium Clinching Joints Mechanical Properties Research

With the development of the automotive light weighting design,new sheet materials such as magnesium alloy,titanium ally has been widely applied. It has risen of the sheet material clinching in recent years,a new connection technology. It through the clinching connection moulds for sheet metal pieces of cold extrusion deformation, the double layer or multilayer metal or non-metal parts such as the traditional connection methods are difficult to realize the connection of new lightweight materials together, form a certain strength of the clinching connection point , through form the lock to realize the material inside the mechanical connection.The paper was based on the 5052 aluminum alloy single-lap clinching joints of dissimilar thickness connecting, the tensile and fatigue properties of the joint was studied based on the test and simulation, and the static strength of the joint was comparatively analyzed. Some work and study achievement were obtained. The main work of the paper can divide into the following several parts:1. The clinching process of aluminum alloy sheet was studies, and the optimal clinching process parameters of the 2.0mm+1.5mm combination of 5052 aluminum alloy clinching joint was obtained. The finite element simulation of the clinching process of the joints was studied, the result was shown that the test and simulation had a good consistency.2. The study of the static mechanical properties of the joint based on the test and simulation.The quasi-static mechanical properties test was adapted to test the clinching joints, the load-displacement curves and the static failure process with failure mode of the joints were acquired. Different thickness connection of the same materials of the joints were comparatively studied.3. The study of the fatigue properties of the joint based on the test and simulation.The fatigue properties test was adapted to test the clinching joint, the S-N curves and the fatigue failure process with failure mode of the joints were acquired. The study of the finite element simulation of the 2.0mm+1.5mm clinching joints showed that the joints got the same fatigue failure mode with the test in the high load level.