高应变率变形的Johnson-Cook动态本构模型参数识别方法

柳爱群; 黄西成

doi:10.3879/j.issn.1000-0887.2014.02.010

高应变率变形的Johnson-Cook动态本构模型参数识别方法

doi: 10.3879/j.issn.1000-0887.2014.02.010

柳爱群¹,
黄西成²

¹鲁东大学土木工程学院, 山东烟台 264025;²中国工程物理研究院总体工程研究所, 四川绵阳 621900

详细信息

作者简介:
柳爱群（1965—），女，河北人，副教授，硕士(E-mail: 13220937928@126.com)

中图分类号: O346.5
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- 被引次数: 0
出版历程
- 收稿日期: 2013-04-23
- 修回日期: 2013-12-09
- 刊出日期: 2014-02-15

Identification of High-Strain-Rate Material Parameters in Dynamic Johnson-Cook Constitutive Model

LIU Ai-qun¹,
HUANG Xi-cheng²

¹The Department of Civil Engineering, Ludong University, Yantai, Shandong 264025, P.R.China;²Institute of Structural Mechanics, China Academy of Engineering Physics,Mianyang, Sichuan 621900, P.R.China

摘要

摘要: Johnson-Cook动态模型是非常重要的材料模型，被广泛应用于冲击动力学数值模拟.通过准静态单轴拉伸和单轴扭转试验获得应变硬化函数中的参数，给出Johnson-Cook模型中热软化参数和应变强化参数的确定方法.采用最优化算法识别材料参数，算法上，在参数空间采用迭代求解，寻找最优点使得实验数据与模型预测之间的偏差最小.讨论了考虑绝热温升影响的JC模型参数m的确定方法.
- Johnson-Cook本构模型 /
- 动态力学特性 /
- 流动应力 /
- 高应变率 /
- 参数识别
Abstract: The dynamic Johnson-Cook constitutive model is widely used in numerical simulation of materials under dynamic loading. This model is very important in impact dynamics. The method of determining the parameters of heat softening and strain-strengthening in the Johnson- Cook model was proposed based on the strain-hardening parameters obtained from the material experiments including quasi-static uniaxial tension and uniaxial torsion. The material parameters were identified with the optimization algorithm, in which the parameter space was solved through iteration and the optimal point was found to minimize the difference between the model prediction and the experimental data. In the adiabatic heating case, the determination method of the Johnson-Cook model parameter m was demonstrated.
- Johnson-Cook constitutive model /
- dynamic mechanical property /
- flow stress /
- high strain rate /
- parameter identification

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参考文献(10)

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