Finite-element analysis of car body structure at the concept design stage

The finite-element analysis process of a car body at concept design phase is discussed.We build the finite-element model of the car body,calculate the Mechanical parameters with the simplified beam section and the stiffness of five main joints according to the mechanical feature of the joints,and simulate the joints with spring and rigid elements.The torsional and bending stiffness and modes of the car are calculated,which are compared with the detailed design results,and the it is showed that the simulation is reasonable and can be used to predict the performance of car body.