某轻型客车防撞梁三点弯力学性能CAE分析与实物验证  

CAE Analysis and Physical Verification of Three-point Bending Mechanical Properties of a Light Passenger Car Bumper Beam

作　　者：关永学 徐莉[1] 曾庆烨 刘豪[1] 李文凤[1] Guan Yongxue;Xu Li;Zeng Qingye;Liu Hao;Li Wenfeng

机构地区：[1]江铃汽车股份有限公司,江西南昌330052

出　　处：《时代汽车》2024年第18期138-141,共4页Auto Time

基　　金：江西省重点研发计划项目“复杂场景下新能源汽车碰撞数字孪生关键技术”(20232BBE50008)研究成果。

摘　　要：文章针对某轻型客车的前防撞梁系统三点弯力学性能进行了深入分析,采用计算机辅助工程(CAE)技术基于详细几何建模和材料属性定义,构建了精确的防撞梁有限元模型,详细分析了防撞梁在不同加载条件下的应力分布、塑性变形区域以及能量吸收情况。提出了整车64公里高速碰撞条件下防撞梁本体不发生断裂,分解至防撞梁三点弯力学性能接受标准及防撞梁耐挤压力计算方法,仿真结果表明,防撞梁设计能够有效分散冲击力,减少对车身结构的损害。为了验证仿真结果的有效性,进行了物理三点弯曲试验,将实际测试数据与CAE分析结果进行了对比。实物测试结果显示,实测数据与仿真分析吻合良好,证明了所采用的CAE方法在预测防撞梁的力学性能方面具有高度的可信度,为优化设计和提高轻型客车的被动安全性提供了理论依据和实践指导。In this paper,the three-point bending mechanical properties of the front bumper beam system of a light passenger car are analyzed in depth.Based on detailed geometric modeling and material property definition,an accurate finite element model of the bumper beam is constructed by using computer aided engineering(CAE)technology.The stress distribution,plastic deformation area and energy absorption of the bumper beam under different loading conditions are analyzed in detail.Under the condition of 64 km high speed collision of the whole vehicle,the bumper beam body does not break,decomposed to the acceptance standard of three-point bending mechanical properties of the bumper beam and the calculation method of bumper beam extrusion pressure are presented.The simulation results show that the bumper beam design can effectively disperse the impact force and reduce the damage to the body structure.In order to verify the validity of the simulation results,physical three-point bending tests were carried out,and the actual test data were compared with the CAE analysis results.The actual test results show that the measured data are in good agreement with the simulation analysis,which proves that the CAE method is highly reliable in predicting the mechanical properties of bumper beams,and provides theoretical basis and practical guidance for optimizing the design and improving the passive safety of light passenger cars.

关 键 词：轻型客车 防撞梁耐挤压力 三点弯曲 优化设计 

分 类 号：U46[机械工程—车辆工程]