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An investigation has been performed to predict full vehicle frontal crash behaviors in collapse zone of the front side rail through the front sub-structure vehicle impact test. Attaching the front structure of a vehicle to the rear crash (FMVSS301) moving barrier makes the front sub-structure vehicle. The test condition is set-up to represent full vehicle crash mode in the collapse zone of the front side rail, a sub-structure FE model is built from full vehicle FE model. Mass and initial velocity of the model are changed so that the model has the same kinetic energy on the US-NCAP frontal crash condition. A preferable model in point of a test set-up is suggested and the analysis result is compared with the other results. The model has 1950Kg of the mass and 20Kph of the impact velocity. Even though the model has 17% of the US-NCAP kinetic energy the result of the sub-structure model look similar to that of full vehicle FE analysis in point of deformation and transmitted section force.

A selective membrane/shell(M/S) scheme is proposed which combines the layered degenerated shell elements in the part where the bending effect can not be negligible with the membrane elements in the part where the bending effects may be negligible. In the proposed scheme membrane elements and layered degenerated shell elements are employed selectively according to the nature of the deformation. The selective M/S scheme is introduced both to the rigid-plastic finite element analysis and to the elastic-plastic finite element analysis for the plane-strain problem. Experiment was carried out in order to verify the validity of the selective M/S scheme. Computational results show that with the proposed selective M/S scheme the bending effects can be effectively considered and the computational time can be reduced significantly.