Practical Failure Criterion of Spot Weld for Crash Simulation

This paper proposed a practical failure criterion of spot welds for combined loading condition for crash simulation. The tests were designed to obtain the failure load of a spot weld under combined loading condition. The seven types of experimental test were conducted to obtain the component of spot weld failure criterion. The failure criterion consists of moment component including normal and shear force. Components of each failure test are obtained from finite element analysis results which are called as hybrid method. The proposed criterion was considered to use Wung [1, 2] model except torsion term. It was found that the criterion of mild steel could be expressed as a function well known in previous researches, however the failure criterion of high strength steel and advanced high strength steel could not be described with it. Here we propose new approach. The newly proposed failure criterion is well applied to hat-specimen simulation result.