| 董鹏,肖大武.考虑晶粒尺寸影响的金属铀的Johnson-Cook本构模型研究[J].装备环境工程,2025,22(4):10-16. DONG Peng,XIAO Dawu.Johnson-Cook Constitutive Model of Uranium Considering the Effect of Grain Size[J].Equipment Environmental Engineering,2025,22(4):10-16. |
| 考虑晶粒尺寸影响的金属铀的Johnson-Cook本构模型研究 |
| Johnson-Cook Constitutive Model of Uranium Considering the Effect of Grain Size |
| 投稿时间：2024-11-25 修订日期：2025-02-18 |
| DOI：10.7643/issn.1672-9242.2025.04.002 |
| 中文关键词: 铀 晶粒尺寸 静动态力学性能 Johnson-Cook本构模型 Hall-Petch关系中图分类号:TG135 文献标志码:A 文章编号:1672-9242(2025)04-0010-07 |
| 英文关键词:uranium grain size static and dynamic mechanical properties Johnson-Cook constitutive model Hall-Petch relationship |
| 基金项目:国家自然科学基金(52394163) |
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| 中文摘要: |
| 目的 获得晶粒尺寸对金属铀静动态力学性能的影响规律，为数值仿真研究提供基础数据。方法 采用铸造粗晶铀样品，经单轴压缩或等径角挤压(ECAP)后再结晶处理，制备得到不同晶粒尺寸的细晶铀样品，对不同晶粒尺寸铀样品开展准静态压缩或者高应变率动态压缩试验，得到不同应变率下金属铀的应力应变试验数据。处理试验数据，得到不同晶粒尺寸金属铀的Johnson-Cook本构模型参数。假定金属铀的屈服强度与晶粒尺寸之间满足Hall-Petch关系，拟合金属铀的屈服强度与晶粒尺寸之间的关系。结果 获得了不同晶粒尺寸金属铀的静动态力学性能数据，建立了考虑晶粒尺寸影响的金属铀的Johnson-Cook本构模型。结论 金属铀的晶粒尺寸对其静动态力学性能的影响很大，随着金属铀的晶粒尺寸减小，屈服强度明显增大。在相同晶粒尺寸下，随应变率提高，屈服强度提高。金属铀的变形以孪晶变形为主。 |
| 英文摘要: |
| The work aims to obtain the effect of grain size on the static and dynamic mechanical properties of uranium, to provide basic data for numerical simulation research. Fine-grained uranium samples with different grain sizes were prepared by casting coarse-grained uranium samples by uniaxial compression or equal channel angular extrusion (ECAP) and then recrystallization, and the quasi-static compression or high strain rate dynamic compression tests were carried out on uranium samples with different grain sizes and finally the stress-strain experimental data of uranium metal at different strain rates were obtained. The experimental data were processed to obtain the Johnson-Cook constitutive model parameters of uranium with different grain sizes and it was assumed that the Hall-Petch relationship between the yield strength and grain size of uranium satisfied the Hall- Petch relationship and the relationship between the yield strength of uranium metal and grain size was fitted. The static and dynamic mechanical properties of uranium with different grain sizes were obtained, and the Johnson-Cook constitutive model of uranium considering the effect of grain size was established. The grain size of uranium has a great effect on its static and dynamic mechanical properties, and the yield strength increases significantly with the decrease of the grain size of uranium. Under the same grain size, the yield strength increases with the increase of the strain rate. The deformation of uranium is dominated by twin deformation. |
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