Structure Optimization of Vehicle Frontal Impact Based on J-C Material Model

Yi Youfu1, Deng Gaotao1, Wang Huanran2 1. R&D Center of ZEDRIV, Ganzhou 341000; 2. Key Laboratory of Impact and Safety Engineering, Ministry of Education, （ Ningbo University, Ningbo 315211） Abstract Based on the tensile test results, J- C type dynamic tensile constitutive equations of the B420LA steel【 】material and the HC420/780DP steel material are determined considering the strain rate effect and temperature effect. The two materials are applied to the structural design of the front longitudinal beam of a new energy vehicle. Based on LSDYNA program and numerical simulation method, the front longitudinal beam structure is optimized considering the deformation mode and crushing energy absorption effect of the vehicle front impact. The results show that the optimized front longitudinal beam has better crushing deformation mode and better energy absorption effect. The peak acceleration of left and right side vehicle is reduced from 58.1g and 56.2g to 38.0g and 39.2g respectively, and the maximum intrusion of the front panel during impact is reduced from 208.7 mm to 182.2 mm, which meets the needs of the research and development for the front impact condition of the vehicle.

Key words: Vehicle frontal crash, Dynamic tensile constitutive equation, Numerical simulation, Front longitudinal beam, B420LA steel, HC420/780DP steel

【引用格式】 , , . J-C [J]. , 2021(7): 26-31.易有福 邓高涛 王焕然 基于 型材料模型的整车正面碰撞结构优化 汽车技术YI Y F, DENG G T, WANG H R. Structure Optimization of Vehicle Frontal Impact Based on J- C Material Model[J]. Automobile Technology, 2021(7): 26-31.