锻压技术

基于薄壁梁落锤压溃高强钢动态力学性能分析

英文标题：Analysis on dynamic mechanical properties of high strength steel based on thin-walled beam crushing

分类号：U465.1+1

出版年,卷(期):页码：2017,42(10):174-179

摘要：

先进高强钢对汽车的安全性和轻量化具有重要影响，其动态力学性能直接影响到整车碰撞安全。针对汽车用先进高强钢的动态力学性能进行分析，选取双相高强钢HC500/DP780，分别采用普通力学拉伸试验机和液压伺服高速拉伸试验机，获得0.001和0.1 s-1的2种准静态下以及1，10，100，200，500和1000 s-1 的6种高应变速率下的单向拉伸试验力学性能，并基于Johnson-Cook方程获得材料的动态力学本构模型。基于薄壁梁落锤压溃试验平台进行压溃性能分析，并采用LS-DYNA进行模拟仿真分析，以此对材料动态力学性能数据及本构模型进行验证分析。结果可知：模型仿真与试验分析的变化趋势基本一致，表明模型仿真的准确性，进而说明材料动态力学性能及本构模型的准确性；随着碰撞速率的增加，管件的吸能比以及载荷比都在减小，这说明碰撞速率对管件的吸能特性有一定影响，随着碰撞速率增加，管件的吸能特性逐渐降低。

Advanced high strength steel has important influence on automobile safety and light weight, and its dynamic mechanical performance directly affects vehicle crash safety. For dual-phase high strength steel HC500/DP780, the dynamic mechanical properties of advanced high strength steel of automobile were analyzed, and the mechanical properties of uniaxial tensile tests were obtained by ordinary mechanical tensile tester and hydraulic servo high speed tensile testing machine under two kinds of quasi-static conditions of 0.001 s-1 and 0.1 s-1 and six kinds of high strain rates 1, 10, 100, 200, 500, 1000 s-1. Then, the constitutive model of material dynamic mechanical properties was obtained by the Johnson-Cook equation. Furthermore, based on the analysis of crushing performance for the thin-walled beam, the simulation analysis was conducted by software LS-DYNA, and the material dynamic mechanical properties and constitutive model were verified. The results show that the simulation results are in good agreement with the experimental analysis, which indicates the accuracy of the model simulation as well as the accuracy of material dynamic mechanical properties and constitutive model. With the increasing of the collision rate, the energy absorption ratio and the load ratio of pipe are all reduced. The above results illustrate that the collision rate of pipe has a certain impact on the energy absorption characteristics, and the energy absorption characteristics of pipe are gradually reduced with the increasing of collision rate.

基金项目：

作者简介：张伟（1986-），男，博士，工程师，E-mail：zhangw@shougang.com.cn

参考文献：

[1]方健, 周冶东, 王磊. 评测车用钢动态变形吸能特性的试验方法[J]. 塑性工程学报, 2012, 19(1):92-96.

Fang J, Zhou Y D, Wang L. A method to determine the features of energy absorption for automotive steels during dynamic deformation [J]. Journal of Plasticity Engineering, 2012, 19(1):92-96.

[2]陈川, 孙成智, 翁洋,等. 汽车用高强度双相钢动态拉伸性能试验研究及仿真[J]. 现代制造工程, 2016, (8):101-105.

Chen C, Sun C Z, Weng Y, et al. Dynamic deformation behavior experiments of dual phase steels for automobile and simulation [J]. Modern Manufacturing Engineering, 2016, (8):101-105.

[3]Park J, Kim D H, Kim H S, et al. Measurement of the dynamic mechanical properties of highstrength steel using wave propagation characteristics[J]. Journal of the Korean Physical Society, 2014, 64(12):1814-1818.

[4]代启锋, 宋仁伯, 蔡恒君,等. 超高强冷轧双相钢DP1000高应变速率下的拉伸性能[J]. 材料研究学报, 2013, 27(1):25-31.

Dai Q F, Song R B, Cai H J, et al. Tensile mechanical behaviour of ultrahigh strength cold rolled dual phase steel DP1000 at high strain rates [J]. Chinese Journal of Materials Research, 2013, 27(1): 25-31.

[5]王文平, 万敏, 吴向东,等. 典型汽车用钢板应变速率敏感性实验[J]. 塑性工程学报, 2012, 19(6):84-89.

Wang W P, Wan M, Wu X D, et al. Experimental research on strain rate sensitivity of automotive steel sheet [J]. Journal of Plasticity Engineering, 2012, 19(6):84-89.

[6]Yin G Q, Huang Z Y, Hui J, et al. Microstructure and mechanical properties of high strength thick wall Hbeam steel after controlled rolling and fast cooling[J]. Heat Treatment of Metals, 2010, 35(5):69-74.

[7]陈俊岭, 舒文雅, 李金威. Q235钢材在不同应变率下力学性能的试验研究[J]. 同济大学学报: 自然科学版, 2016, 44(7):1071-1075.

Chen J L, Shu W Y, Li J W. Experimental study on dynamic mechanical property of Q235 steel at different strain rates [J]. Journal of Tongji University: Natural Science, 2016, 44(7):1071-1075.

[8]赵辉. 高应变速率下超高强冷轧双相钢的拉伸性能研究[J]. 铸造技术, 2014, 35(10):2217-2219.

Zhao H. Tensile properties super-high-strength coldrolled dualphase steel under high strain rate[J]. Foundry Technology, 2014, 35(10): 2217-2219.

[9]GB/T 30069.2—2016, 金属材料高应变速率拉伸试验第2部分：液压伺服型与其他类型试验系统 [S].

GB/T 30069.2—2016, Metallic materials—Tensile testing at high strain rates—Part 2: Servo-hydraulic and other test systems[S].

[10]李建光, 施琪, 曹结东. JohnsonCook本构方程的参数标定[J]. 兰州理工大学学报, 2012, 38(2):164-167.

Li J G, Shi Q, Cao J D. Parameters calibration for JohnsonCook constitutive equation [J]. Journal of Lanzhou University of Technology, 2012, 38(2):164-167.

[11]苑文婧, 刘晓航, 田浩彬. 应变速率对低合金高强钢力学性能的影响[J]. 上海第二工业大学学报, 2013, 30(1):43-47.

Yuan W J, Liu X H, Tian H B. Effect of the strain rate on mechanical properties of high strength low alloy steel [J]. Journal of Shanghai Second Polytechnic University, 2013, 30 (1):43-47.

[12]王亚芬, 杜洪志, 赵广东. 基于汽车用钢碰撞性能的高应变速率测试探讨[J]. 物理测试, 2016, 34(6):25-28.

Wang Y F, Du H Z, Zhao G D. Discussion of high strain rate test based on collision performance of steel for automobile [J]. Physics Examination and Testing, 2016, 34(6):25-28.

[13]连昌伟, 陈新平, 俞宁峰. 高伸长率QP钢在高应变速率下的力学特性[J]. 锻压技术, 2017, 42(7):164-168.

Lian C W, Chen X P, Yu N F. Mechanical properties on high elongation steel QP under high strain rate [J]. Forging & Stamping Technology, 2017, 42(7):164-168.

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