Vehicle structural collapse analysis using a finite element limit method

This paper discusses the collapse behaviour of vehicle structures under qua si-static loading conditions. The finite element limit analysis for three-d imensional structures is formulated based on the duality theorem in plastic ity. The analysis considers sequential deformation of structures with work- hardening effects. The collapse analysis for an S-shaped frame is conducted using both the limit analysis program developed here and the commercial co de ABAQUS. Results show a good agreement in load-carrying capacity and defo rmation mode predictions. Example studies also demonstrate that the method presented can be used to identify the weak part of a structure and change i ts design to enhance the load-carrying capacity and reduce vehicle passenge r compartment distortions.