Abstract
This paper describes the results of the frontal crash simulation of a commercial vehicle using the nonlinear finite element method. The dynamic responses of the vehicle during the frontal crash at 48.3 km/h and 8 km/h are presented. In the developing stage of the design the structure of the front longitudinal beam is optimized, hence the amount of energy absorbed increases greatly. In the test stage of the whole vehicle, the data of the simulation predict that the hinge of the engine hood would fracture during the crash. This fact has also been validated by the test. The failure of the engine hood hinge would be a danger to both the driver and the passengers. So, according to the simulation, the structure and material of the engine hood and hinge are modified. As a result the deformation mode of the engine hood is improved accordingly.
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