Predictive Model of Tensile Strength in Flat Clinching

doi:10.3901/JME.2018.24.061

Abstract

Abstract: Flat clinching has become a research hotspot in the automotive lightweight technology field, but the strength of the clinched joint is obtained by many destructive tests. It has the disadvantage of high cost and long period. Therefore, three failure modes and causes of neck failure, pull-out failure and mixture failure during the tensile strength tests were analysed. The simulation model of flat clinching was established. The geometric parameters of the clinched joint were obtained, and the accuracy of the numerical simulation was verified through section observation tests of the clinched joint. The predictive model of tensile strength model was established based on the principal stress method during pipe drawing process. Further the correctness of the tensile strength predictive model was verified based on numerical simulation through the tensile strength tests. And the effect of bottom thickness on tensile strength was studied. The results show that the maximum error between predicted tensile strength and experimental value of clinched joints is 14.8%. The main errors are derived from the parameters such as work hardening coefficient, friction coefficient and bottom thickness of clinched joints; The tensile strength of clinched joints increases with the decrease of the bottom thickness. When the bottom thickness is 0.50 mm, the tensile strength of Al5052-Al5052 is the largest, and the clinched joints occurs mixed failure. An efficient and low-cost method for evaluating the forming quality of clinched joints is established, it also has important directive significance for the optimization of the geometric parameters of clinched joints in flat clinching.

Key words: flat clinching, lightweight sheets, tensile strength

CLC Number:

HAN Xiaolan, CHEN Chao, LIU Chen, ZHAO Shengdun, ZHAO Yongqiang. Predictive Model of Tensile Strength in Flat Clinching[J]. Journal of Mechanical Engineering, 2018, 54(24): 61-68.

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