Constitutive modelling of Al7075 using the Johnson–Cook model
| Autor: | Davood Almasi, A. H. Mirzaei, Sajad Rasaee |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Viscoplasticity Constitutive equation 02 engineering and technology Mechanics Atmospheric temperature range Flow stress Strain rate 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Mechanics of Materials Hardening (metallurgy) General Materials Science 0210 nano-technology Softening Analysis method |
| Zdroj: | Bulletin of Materials Science. 43 |
| ISSN: | 0973-7669 0250-4707 |
| DOI: | 10.1007/s12034-019-1987-x |
| Popis: | In this paper, hot compression behaviour of Al7075 in the temperature range of 573–723 K and the strain rate range of 0.001–0.1 $$\hbox {s}^{-1}$$ , based on standard requirements, was studied. The prediction of flow stress was performed using constitutive equations based on the basic and modified-Johnson–Cook model and the accuracy of the proposed models was estimated by comparing with the experimental results by the statistical error analysis method. Based on the experimental results, flow stress is changed significantly with changes in the strain rate and temperature. However, the basic model cannot predict the correlated effects of these parameters which decrease its accuracy of model, the flow stress of the materials especially at high temperatures. During the calculation of the constants based on the modified model, the effects of hardening and softening behaviour were included in addition to considering the correlated effects of the parameters. The accuracy of the modified model increased significantly when compared with experimental results. |
| Databáze: | OpenAIRE |
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