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      https://www.ias.ac.in/article/fulltext/boms/043/0023

    • Keywords

       

      7075 aluminium alloy; hot compression deformation; constitutive equation; Johnson–Cook model.

    • Abstract

       

      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 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.

    • Author Affiliations

       

      SAJAD RASAEE1 A H MIRZAEI1 D ALMASI1

      1. Department of Mechanical Engineering, Faculty of Energy, Kermanshah University of Technology, Kermanshah 6715685420, Iran
    • Dates

       
  • Bulletin of Materials Science | News

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