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| Johnson-Cook Constitutive Model of Uranium Considering the Effect of Grain Size |
| Received:November 25, 2024 Revised:February 18, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.04.002 |
| KeyWord:uranium grain size static and dynamic mechanical properties Johnson-Cook constitutive model Hall-Petch relationship |
| Author | Institution |
| DONG Peng |
Institute of Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
| XIAO Dawu |
Institute of Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
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| Abstract: |
| 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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