高温高应变率下纯锆的本构模型研究

肖大武; 李英雷; 胡时胜

doi:10.11858/gywlxb.2009.01.008

高温高应变率下纯锆的本构模型研究

doi: 10.11858/gywlxb.2009.01.008

1.
中国工程物理研究院流体物理研究所，冲击波物理与爆轰物理国防科技重点实验室，四川绵阳 621900；
2.
中国科学技术大学中国科学院材料力学行为和设计重点实验室，安徽合肥 230027

详细信息

通讯作者:
胡时胜

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出版历程
- 收稿日期: 2008-03-24
- 修回日期: 2008-07-18
- 发布日期: 2009-02-15

Constitutive Model of Pure Zirconium under High Temperature and High Strain Rate

1.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621900, China;
2.
Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China

More Information

Corresponding author: HU Shi-Sheng

摘要

摘要: 研究了常温至1 073 K、不同应变率下（4.110－4 s－1～2.8103 s-1）锆的压缩力学性能。结果表明，锆的流动应力对温度和应变率的变化比较敏感，随应变率的提高而增大，随温度的升高而降低。基于位错动力学理论，建立了锆的本构模型，并考虑塑性变形过程中孪晶演化的影响，对模型进行了修正。修正后的本构模型预测结果与实验结果吻合较好，可描述很宽应变率和温度范围内锆的塑性变形行为。
- 锆 /
- 流动应力 /
- 高温 /
- 高应变率 /
- 本构模型
Abstract: The thermo-mechanical response of zirconium has been investigated under temperature ranging from normal temperature to 1 073 K and strain rate from 4.110－4 s－1 to 2.8103 s－1. Results show that the flow stress and strain hardening rate of zirconium are very sensitive to the changes of temperature and strain rate. The flow stress and strain hardening rate increase with the increase of strain rate, and decrease with the increase of temperature. Based on the concept of dislocation kinematics, a physically based constitutive model is developed, and the model is modified by taking into account of the effect of developing twins during deformation. The modified model could be used to predict the flow stress of zirconium over a wide range of temperature and strain rates. The experimental results are in good agreement with the predictions.
- zirconium /
- plastic flow stress /
- high temperature /
- high strain rate /
- constitutive model

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参考文献(13)

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