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Numerical and experimental investigations in electromagnetic riveting with different rivet dies
Authors:Junjia Cui  Lin Qi  Hao Jiang  Guangyao Li  Xu Zhang
Affiliation:1.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha,China;2.Joint Center for Intelligent New Energy Vehicle,Shanghai,China;3.College of Automotive and Mechanical Engineering,Changsha University of Science and Technology,Changsha,China
Abstract:In this work, the numerical simulations and electromagnetic riveting (EMR) experiments were conducted to investigate microstructure evolution and the forming mechanism of adiabatic shear bands (ASBs). And the effects of rivet dies on microstructure distributions in formed heads and mechanical properties of riveted structures were systematically explored. The impact velocity and deformation distribution results demonstrated that the proposed numerical method was accurate and reliable. The simulation results showed the slope angle of rivet dies notably affected the plastic flow of materials, and then determined the microstructure distribution in formed heads. The combined effects of inhomogeneous plastic flow and thermal softening were accounted for the forming of ASBs. The formed heads had two obvious ASBs (upper and lower ASB) for the 40° rivet die and flat rivet die. The formed heads only had the lower ASB and no clear upper for the 60° rivet die and 80° rivet die. The pull-out test results showed that the specific rivet die could improve the mechanical properties of the EMR joints, which contribute to the engineering applications of EMR riveted structures.
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