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This paper describes the rotational behavior of the vehicle in the vertical plane at frontal collision against a flat barrier. The control of the rotational behavior is important because this often has a great influence on both passenger compartment integrity and occupant protection. The authors examine the cause of this rotational behavior of the vehicle using the numerical simulation of a full scale passenger car model with an explicit finite element method. As a result, it is found that the deformation process and the transmitted force of basic framework greatly affect to the rotational behavior. The simulation explains its difference between a typical FR (front engine &, front drive) vehicle and a FR (front engine & rear drive) vehicle. The mechanism during the rotational behavior is analyzed by means of the transmitted force to subsequent frame members. The typical comparison of the simulation and the vehicle test are also presented.

In order to secure effective occupant protection at vehicle collisions, it is necessary to conduct close examination into vehicle crash characteristics as well as interior parts, etc. This paper analyzes the behavior of a HYBRID III dummy restrained by three point seatbelt using MVMA2D computer simulation program at a 35 mph vehicle frontal barrier crash. As a result, it is found for good agreement between experiment and simulation that the exact input data of successive toeboard intrusion play an important role. As for the parametric study on vehicle crashworthiness, the authors propose the convenient method to represent the actual crash pulse by two simplified trapezoids. Then using these trapezoids, the parametric study clarifies the influence of vehicle deformation characteristics as well as the interior parts on dummy injury.