Development of Finite Element Models of Restraint System for Injury Analysis in Side Impact

The use of occupant protection simulation by finite element model is increasing for vehicle development. Finite element models of moving deformable barrier honeycomb, vehicle body, dummy, and restraint system have been developed to predict the dummy injury values. To more accurately predict the dummy injury indices in side impact analysis, this paper describes the improvement of finite element models of restraint system such as torso airbag and polyurethane pad. The improved model of polyurethane pad was able to simulate both of anisotropy and breaking. The improved model of torso airbag was able to simulate the deployment behavior from inside of seat back foam. Finally, full vehicle level FE analysis was conducted to confirm the prediction accuracy of the dummy injury indices using the improved finite element models. The results show that the dummy injury indices correlate well with actual crash testing.