船用921A钢高温、高应变率下动态本构模型研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (20) : 46-53.

论文

吴海军1,2，王可慧2，李明2，段建2，周刚2，张庆明1

作者信息 +

A study on a dynamic constitutive model of 921A shipbuilding steel at high temperature and high strain rate

WU Haijun1,2，WANG Kehui2，LI Ming2，DUAN Jian2，ZHOU Gang2，ZHANG Qingming1

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文章历史 +

摘要

921A钢是我国重要的舰船结构钢，研究921A钢在高温、高应变率条件下的动态力学性能对舰船结构防护设计和安全评估具有重要意义。采用电子万能试验机和带有同步组装系统的高温Hopkinson压杆实验装置，对921A钢不同温度（25~500°C）、不同应变率（0.001~4000s-1）下的准静态和动态力学性能进行了研究。结果表明，921A钢具有明显的应变率强化效应和热软化效应，应变率强化效应随温度升高逐渐减弱，热软化效应对应变率变化不敏感。考虑了应变、应变率和温度对力学性能的影响，拟合得到了921A钢的Johnson-Cook本构模型参数。开展了弹体高速撞击双层921A钢板的实验，并采用得到的Johnson-Cook本构模型参数进行了数值仿真，靶板弹孔平均直径和破坏形貌的仿真结果与实验结果吻合较好，验证了该模型能够较好地描述921A钢在高速冲击条件下的动态力学行为。
关键词：固体力学；921A钢；动态力学性能；应变率强化效应；热软化效应；Johnson-Cook本构模型

Abstract

921A steel is an important ship structural steel in China. It is of great significance to study the dynamic mechanical properties of 921A steel at high temperature and high strain rate for ship structural protection design and safety evaluation. By using electronic universal testing machine and high temperature Hopkinson pressure bar with synchronous assembly system, the quasi-static and dynamic mechanical properties of 921A steel were studied over a wide range of strain rates (from 0.001s-1 to 4000s-1) and temperatures (from 25°C to 500°C). The results show that 921A steel has obvious strain rate strengthening effect and thermal softening effect. The strain rate strengthening effect decreases gradually with the increase of temperature, and the thermal softening effect is not sensitive to the change of strain rate. Considering the effects of strain, strain rate and temperature on mechanical properties, the Johnson-Cook constitutive model parameters of 921A steel were obtained by fitting experimental data. The average diameter of the projectile hole and the damage morphology of the double-layer 921A steel plate obtained by numerical simulation are in good agreement with the experimental results. It is verified that the parameters of the constitutive model can describe the dynamic mechanical behaviors of 921A steel under the condition of high-speed impact.
Key words: solid mechanics; 921A steel; dynamic mechanical properties; strain rate strengthening effect; thermal softening effect; Johnson-cook constitutive model

导出引用

吴海军1,2，王可慧2，李明2，段建2，周刚2，张庆明1. 船用921A钢高温、高应变率下动态本构模型研究[J]. 振动与冲击, 2022, 41(20): 46-53

WU Haijun1,2，WANG Kehui2，LI Ming2，DUAN Jian2，ZHOU Gang2，ZHANG Qingming1. A study on a dynamic constitutive model of 921A shipbuilding steel at high temperature and high strain rate[J]. Journal of Vibration and Shock, 2022, 41(20): 46-53

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