 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 13427 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8178
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| In English (Mech. Solids): | | 5249 |
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| Song Hyok Ko, Kyong Ho Sim, Chol Song Ryang, and Hyon Song Pak, "Comparisons of Modified Constitutive Models to Predict Flow Stress of Mg-13Gd-3.5Y-2Zn-0.5Zr Alloy in Hot Compression," Mech. Solids. 60 (6), 5401-5415 (2025) |
| Year |
2025 |
Volume |
60 |
Number |
6 |
Pages |
5401-5415 |
| DOI |
10.1134/S0025654425603155 |
| Title |
Comparisons of Modified Constitutive Models to Predict Flow Stress of Mg-13Gd-3.5Y-2Zn-0.5Zr Alloy in Hot Compression |
| Author(s) |
Song Hyok Ko (Faculty of Materials Science and Technology, Kim Chaek University of Technology, Pyongyang, 999093 Democratic People’s Republic of Korea)
Kyong Ho Sim (Faculty of Materials Science and Technology, Kim Chaek University of Technology, Pyongyang, 999093 Democratic People’s Republic of Korea, sgh83818@star-co.net.kp)
Chol Song Ryang (Faculty of Materials Science and Technology, Kim Chaek University of Technology, Pyongyang, 999093 Democratic People’s Republic of Korea)
Hyon Song Pak (Faculty of Materials Science and Technology, Kim Chaek University of Technology, Pyongyang, 999093 Democratic People’s Republic of Korea) |
| Abstract |
The true stress-true strain curves of a Mg-13Gd-3.5Y-2Zn-0.5Zr alloy were acquired by isothermal compression tests at various deformation temperatures of 350–500°C and strain rates of 0.001–1 s−1. The Johnson-Cook, strain-compensated Arrhenius-type and microstructure-based models were developed and further modified to improve a prediction accuracy. The determination coefficient and average absolute relative error were 0.9380, 10.67% for the modified Johnson-Cook model, 0.9536, 6.38% for the strain-compensated Arrhenius-type model, and 0.9813, 3.37% for the microstructure-based model, respectively. As a result, the modified Johnson-Cook model and the Arrhenius-type model could not correctly predict the high-temperature flow stress of this alloy. Meanwhile, the microstructure-based model is best suited for the prediction of high-temperature flow stress due to its very high prediction accuracy, although the calculation process is very complex. The proposed constitutive material models are of great importance in the simulation and optimization of hot working processes of Mg-13Gd-3.5Y-2Zn-0.5Zr alloys. |
| Keywords |
Mg-13Gd-3.5Y-2Zn-0.5Zr alloy, Johnson-Cook model, Arrhenius-type model, micro- structure-based model, high-temperature flow stress |
| Received |
16 June 2025 | Revised |
10 September 2025 | Accepted |
11 September 2025 |
| Link to Fulltext |
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