Numerical simulation of High Speed Nailing process to join dissimilar materials

Abstract : Lightweigthing structures using mixed material components have become one of the main target of automotive industry’s future. Among the joining processes under exploration, the present work focuses on High-Speed Nailing. Experimental campaigns are conducted under laboratory conditions on layers superposition made of cast aluminium, dual-phase steels DP780 and DP1180. Joining kinematics, sheets fracture modes, reaction the nail insertion and nailed-joint strengths are investigated in various conditions of experiment. Material models are chosen to account for the dynamic and fracture phenomena exhibit by materials in the joining stage. Mechanical tests are performed on nail and sheets materials under different strain-rates and stress-states and used as references for the calibration procedure. A finite element model of the joining stage is built; its sensitivity to mesh size, friction and material formulation is evaluated and its limitations captured by either inappropriate joining pressure setting or nail brittleness. After a new equilibrium is reached, the nailed-joint is tested through cross-tension and sheartension simulations to tackle the prediction of in-service properties.
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Fabien Goldspiegel. Numerical simulation of High Speed Nailing process to join dissimilar materials. Mechanics of materials [physics.class-ph]. PSL Research University, 2018. English. ⟨NNT : 2018PSLEM028⟩. ⟨tel-02352202⟩

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