Crash Testing Of Self Piercing Rivet Using Ls Dyna Software

摘要

Self-piercing riveting (SPR) is a process of joining two pieces of material using a rivet. Unlike conventional riveting, self-piercing riveting does not require a pre-drilled hole, because the rivet creates its own hole as it is being inserted. This makesself-piercing rivet is good in terms of production cost reduction and ease of use compared to conventional riveting. The practice of coated, lightweight and high-strength materials, such as galvanized or pre-painted steel and aluminium is increased which has steered industries to re-examine conventional methods of assembling components. The value of a self-piercing rivet that syndicates high joint integrity with rapid assembly times that become obvious because welding of these materials is challenging or difficultand assembly using conventional rivets is slow and costly .A self-piercingrivet jointsample is studied. The sample consists of 4 mm thick sheets with a rivet of 8 mm in waist-diameter. The finite element software LS-Dyna /Explicit, and involve dynamic inertia effects is used for the simulation. The Johnson-Cook plasticity model is used to describe the materials, Mat 20 and Mat 24 ie., Mat 20 denotes Rigid Material and Mat 24 denotes Piecewise Linear Isotropic Plasticity. The results are gathered and assembled to energy-curves and velocity-curves.