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一种高强度钢的动态力学本构参数识别和数值模拟
引用本文:谢恒,吕振华.一种高强度钢的动态力学本构参数识别和数值模拟[J].爆炸与冲击,2011,31(3):279-284.
作者姓名:谢恒  吕振华
作者单位:清华大学汽车工程系,北京,100084;清华大学汽车工程系,北京,100084
摘    要:分析了N-1钢在不同应变率条件下(10-3~103s-1)的应力应变关系实验结果,得到了N-1钢的应 变率强化特性。修正了平板试件断裂面中心的真实应力,并通过对真实应变与最小截面的厚度缩减率关系的 研究,得到了断裂面中心的真实应变,从而识别出了N-1钢的修正Johnson-Cook本构模型的参数。利用所确 定的本构关系模型,对N-1钢平板试件的杆-杆型冲击拉伸过程进行了数值模拟,模拟结果与实验结果较吻 合,验证了采用的修正的Johnson-Cook本构模型参数的实验识别方法以及数值模拟方法的正确性。

关 键 词:固体力学  本构模型参数  修正的Johnson-Cook本构模型  高强度钢  动态力学特性

Identification of dynamic constitutive parameters of a high-strength steel and numerical simulation
XIE Heng,L Zhen-hua.Identification of dynamic constitutive parameters of a high-strength steel and numerical simulation[J].Explosion and Shock Waves,2011,31(3):279-284.
Authors:XIE Heng  L Zhen-hua
Institution:1.DepartmentofAutomotiveEngineering,TsinghuaUniversity,Beijing 100084,China
Abstract:The engineering stress-engineering strain relations of N-1 steel were measured using SHTB at different strain rates from 10-3 to 103 s-1.The results were analyzed,and the rate-hardening law of N-1 steel was determined.The true stress at the center of the fractured cross-section was calculated.The relation between true strain and specimen's varying thickness within the smallest cross-section was explored,and the true strain at the center of the fractured cross-section was identified with a modified approach....
Keywords:solid mechanics  constitutive model parameters  modified Johnson-Cook constitutive model  high-strength steel  dynamic mechanical property  
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