38CrMoAl高强度钢动态力学性能及其J-C本构模型
Dynamic Mechanical Properties and J-C Constitutive Model for38CrMoAl High Strength Steel
摘 要
分别利用液压试验机和分离式霍普金森压杆试验装置对38CrMoAl高强度钢进行低应变速率（10-4，10-3，10-2 s-1）下的准静态压缩试验和高应变速率（850~4 500 s-1）下的动态压缩试验，研究了该钢的动态压缩力学性能以及动态压缩后的显微组织；考虑应变速率强化效应和绝热效应对Johnson-Cook（J-C）本构模型进行修正，并进行了试验验证。结果表明：试验钢的真实屈服强度随着压缩应变速率的增加而增大，表现出应变速率强化效应；经高应变速率压缩后，试验钢中出现了具有一定耐蚀性的强化区；修正后的J-C本构模型预测得到试验钢在不同应变速率下的真应力与试验结果的平均相对误差范围为1.76%~3.99%，这表明修正后的J-C本构模型能够准确地描述该钢的动态压缩力学特性。
分离式霍普金森压杆试验
J-C本构模型
应变速率强化效应
绝热效应
38CrMoAl steel
split Hopkinson pressure bar test
J-C constitutive model
strain rate enhancement effect
adiabatic effect
Abstract
Quasi-static compression at low strain rates (10-4, 10-3, 10-2 s-1) and dynamic compression at high strain rates (850-4 500 s-1) were conducted on 38CrMoAl high strength steel with a hydraulic testing machine and a split Hopkinson pressure bar test device. The dynamic compressive mechanical properties of the steel and the microstructure after dynamic compression were studied. Considering the strain rate enhancement effect and adiabatic effect, the Johnson-Cook (J-C) constitutive model was modified, and was verified by experiments. The results show that the true yield strength of the test steel increased with the increase of the compressive strain rate, indicating an obvious strain rate enhancement effect. After compression at high strain rates, the strengthening zone with certain corrosion resistance appeared in the microstructure of the test steel. The average relative errors between the prediction by the modified J-C constitutive model and the experimental values of the true stresses were 1.76%-3.99%, indicating that the modified J-C constitutive model could describe the dynamic compressive mechanical properties of 38CrMoAl steel accurately.
中图分类号 V252 DOI 10.11973/jxgccl202105014
所属栏目 物理模拟与数值模拟
基金项目 山东省高等院校“青创科技计划”资助项目（2020KJA014）
收稿日期 2020/6/12
修改稿日期 2021/3/23
网络出版日期
作者单位点击查看
备注包志强(1998-),男,安徽宿州人,助理工程师,学士
引用该论文: BAO Zhiqiang,ZHANG Yong,ZHANG Zhuzhu,FAN Weijie,MENG Lili. Dynamic Mechanical Properties and J-C Constitutive Model for38CrMoAl High Strength Steel[J]. Materials for mechancial engineering, 2021, 45(5): 76～83
包志强,张勇,张柱柱,樊伟杰,孟莉莉. 38CrMoAl高强度钢动态力学性能及其J-C本构模型[J]. 机械工程材料, 2021, 45(5): 76～83
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【22】冉春,陈鹏万,李玲,等.中高应变率条件下TC18钛合金动态力学行为的实验研究[J].兵工学报,2017,38(9):1723-1728. RAN C,CHEN P W,LI L,et al.Experimental research on dynamic mechanical behavior of TC18 titanium alloy under medium and high strain rates[J].Acta Armamentarii,2017,38(9):1723-1728.
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【25】HU H H,LIM J H,PARK S H.High speed tensile test of steel sheets for the stress-strain curve at the intermediate strain rate[J].International Journal of Automotive Technology,2009,10(2):195-204.
【26】NEMAT-NASSER S,GUO W G.Thermomechanical response of DH-36 structural steel over a wide range of strain rates and temperatures[J].Mechanics of Materials,2003,35(11):1023-1047.
【27】张连生,黄风雷,段卓平,等.材料动态强度的应变率效应及其唯象本构模型[C]//第十届全国冲击动力学学术会议论文摘要集.太原:中国力学学会,2011:141-141. ZHANG L S, HUANG F L, DUAN Z P, et al. Strain rate effect of material dynamic strength and its phenomenological constitutive model[C]//Proceedings of the 10th National Conference on Shock Dynamics. Taiyuan:Chinese Society of Mechanics, 2011:141-141.
【28】尚兵,盛精,王宝珍,等.不锈钢材料的动态力学性能及本构模型[J].爆炸与冲击,2008,28(6):527-531. SHANG B,SHENG J,WANG B Z,et al.Dynamic mechanical behavior and constitutive model of stainless steel[J].Explosion and Shock Waves,2008,28(6):527-531.
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