Abstract: This paper applys a non-linear numerical method to simulate the viscouselastic plastic deformation and its stress distribution. The resolution agrees with the theoretical results from the P-T/T stress PDE (Maxwell) equation. The resulting accele rations are confirmed by the European EEVC experimental solutions. Therefore the complex material stress distribution in large deformation is obtained. A post-estimate solver is used for sensitive pre-stage deformation when impact occurs. The study is useful for mathematical modeling of passive safety in automotive protection devices and air-flow triggering control.

Key words: adaptiv e FEA, differential equation, impact, numerical simulation, perturbation parameters, elastic-plastics