Crash simulation and structure optimization of a thin-walled front longitudinal beam structure

SU Jian，WANG Qiu-cheng

（School of Mechanical Engineering，Zhejiang University of Technology，Hangzhou 310014，China）

Abstract：Aiming at the shortage of energy absorption characteristic，the existing structure of the front longeron was improved so that more energy absorbed by a front longeron in the process of frontal crash. According to the design parameters of the front longeron，such as thickness，spot weldpitch and spot diameter，etc.，the finite element model of the front longeron was established. The impact procession of front longeron was simulated by HyperMesh and LS-DYNA. The structure was improved by adding induced slot and adding reinforcement plate. The results indicate that，the optimized front longeron unit mass absorbed energy increased by 63.3%. Through this method，front longeron improves the energy absorption characteristics，thus reduces the damage caused by collision.