Analysis of Compressive and Bending Collapse of the Vehicle Structure 2002-01-0680
The focus of this research is to analyze the mechanism of the compressive and bending collapse for a thin-walled box beam taking into consideration its initial imperfection, which represents a part of the vehicle structures under a high speed crash test, by using the Finite Element (FE) Method.
According to our analysis in high-speed crash tests, most of the vehicle structures are damaged by compression and bending. We approached these problems by simplifying the vehicle structure in analysis to the thin-walled box beam to analyze crash behavior under compression and bending conditions by using the FE Method. We mainly examined the stress distribution and behavior of collapse of the box beam with the effective area method.
As a result of this research, it is recognized that the beginning of collapse is elastic buckling. And also, it could be divided into two different areas such as an effective area and ineffective area, and these areas are clearly discerned on the box beam under compression and bending. In addition, it is examined that the effective area has a strong relationship with steel type and dimension that could be formulated. Comparing this equation result and the FE Method, the results show there is a potential for predicting the collapse force. It is concluded our research that considering the effective steel type and dimension by using our equation further improvement of the technique of reinforcement for the vehicle structures can be attained.