Transactions of Materials and Heat Treatment

Title：Optimization design on variable strength of automobile front bumper based on hot roll bending process

Authors： Yuan Jingxi Jia Ligang Shi Lei

Unit： Research Institute Baoshan Iron & Steel Co. Ltd. State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel) SAIC-GM-Wuling Automobile Co. Ltd.

KeyWords： hot roll bending process front bumper variable strength approximate model collision performance

ClassificationCode：U463.8

year,vol(issue):pagenumber：2020,45(8):127-133

Abstract：

In order to improve the collision performance and optimize the deformation mode during the collision process for on automobile front bumper beam, based on the characteristics of hot roll bending process, taking the strengths of different load-bearing areas in front bumper beam as variables, the sample data were generated and calculated by Latin hypercube method, and for the calculation results, an approximate model was built by mobile least squares method. Then, taking the maximum peak load as the target and the deformation amount as the constraint condition, the optimized solution was conducted by the genetic algorithm, and the optimized design scheme of variable strength for the automobile front bumper beam was obtained. The optimization results show that the peak load for the scheme of variable strength front bumper is 4% higher than the base model, and the deformation amount for the scheme of variable strength front bumper is 65% less than the base model. Therefore, both deformation mode and collision performance are improved. According to the optimized design scheme, the hot roll bending samples with variable strength were produced, and the result shows that the variable strength distribution is achieved by differential quenching strengthening at different positions of tube parts.

Funds：

袁静玺(1992-)，男，硕士，助理研究员，E-mail：yuanjingxi@baosteel.com

Reference：

[1]Sonawane C R, Shelar A L. Strength enhancement of car front bumper for slow speed impact by FEA method as per IIHS regulation[J]. Journal of the Institution of Engineers (India): Series C, 2018, 99: 599-606.
[2]杨文志, 阎昱, 曹坤洋, 等. 高强度钢局部加热辊弯成形分析[J]. 北方工业大学学报, 2013, 25(3):76-81.
Yang W Z, Yan L, Cao K Y, et al. Analysis of local heating of high-strength steel roll forming[J]. Journal of North China University of Technology, 2013, 25(3):76-81.
[3]穆伟. 汽车前保险杠结构设计及优化[J]. 机械设计与制造工程, 2018, 47(9):43-46.
u W. The structure design and optimization of automobile front bumper[J]. Mechanical Design & Manufacturing, 2018, 47(9): 43-46.
[4]杨江林, 张诗阳. 基于非线性拓扑优化的汽车变厚度保险杠耐撞性设计[J]. 中国机械工程, 2017, 28(17):15-21.
Yang J L, Zhang S Y. Crashworthiness design of bumper beam structure with tailor rolled using nonlinear topology optimization method[J]. China Mechanical Engineering,2017, 28(17):15-21.
[5]王庆, 卢家海,刘钊,等. 碳纤维增强复合材料汽车保险杠的轻量化设计[J]. 上海交通大学学报, 2017, 51(2):136-141.
Wang Q，Lu J H, Liu Z, et al. A lightweight design of carbon fiber reinforced plastic auto bumper[J]. Journal of Shanghai Jiaotong University, 2017, 51(2):136-141.
[6]孙光永. 薄板结构成形与耐撞性优化设计关键技术研究[D]. 长沙: 湖南大学, 2011.
Sun G Y. Key Technology of Optimization Design Research on the Sheet Metal Forming and Thin-walled Structure Crashworthiness[D]. Changsha: Hunan University, 2011.
[7]王国春, 成艾国, 胡朝辉, 等. 基于Kriging模型的汽车前部结构的耐撞性优化[J]. 汽车工程, 2011, 33(3): 208-212.
Wang G C, Cheng A G，Hu C H, et al. Crashworthiness optimization of vehicle frontal crash based on kriging model[J]. Automotive Engineering, 2011, 33(3): 208-212.
[8]龙腾, 刘建, 郭晓松, 等. 基于计算试验设计与代理模型的飞行器近似优化策略探讨[J]. 机械工程学报,2016, 52(14): 79-105.
Long T, Liu J, Guo X S, et al. Discuss on approxmate optimization strategies using design of computer experments and metamodels for flight vehicle design[J]. Journal of Mechanical Engineering, 2016, 52(14):79-105.
[9]雷刚, 罗强, 刘意. 基于HyperStudy的乘员约束系统参数优化[J]. 重庆理工大学学报: 自然科学, 2011,25(5):1-5.
Lei G, Luo Q, Liu Y. The occupant restraint system parameter optimization based on hyperstudy[J]. Journal of Chongqing University of Technology: Natural Science, 2011,25(5):1-5.
[10]刘俊. 移动最小二乘散点曲线曲面拟合与插值的研究[D]. 杭州: 浙江大学, 2011.
Liu J. Fitting and Interpolation for Curve and Surface from Scattered Data Using Moving Least Squares Method[D]. Hangzhou: Zhejiang University, 2011.
[11]曾清红, 卢德唐. 基于移动最小二乘法的曲线曲面拟合[J]. 工程图学学报, 2004, 25(1):84-89.
Zeng Q H, Lu D T. Curve and surface fitting based on moving least squares[J]. Journal of Engineering Graphics, 2004, 25(1):84-89.
[12]Salkauskas P L. Surfaces generated by moving least squares methods[J]. Mathematics of Computation, 1981, 37:141-158.
[13]Holland J. Adaptation in Nnatural and Artificial System：An Introduction with Application to Biology, Control and Artificial Intelligence[M]. Ann Arbor, USA: University of Michigan Press,1975.

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