Structural Engineering and Mechanics

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Ratcheting assessment of austenitic steel samples at room and elevated temperatures through use of Ahmadzadeh-Varvani Hardening rule

  • Xiaohui Chen (School of Control Engineering, Northeastern University at Qinhuangdao) ;
  • Lang Lang (School of Control Engineering, Northeastern University at Qinhuangdao) ;
  • Hongru Liu (School of Control Engineering, Northeastern University at Qinhuangdao)
  • Received : 2021.09.14
  • Accepted : 2023.08.17
  • Published : 2023.09.25
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Abstract

In this study, the uniaxial ratcheting effect of Z2CND18.12N austenitic stainless steel at room and elevated temperatures is firstly simulated based on the Ahmadzadeh-Varvani hardening rule (A-V model), which is embedded into the finite element software ABAQUS by writing the user material subroutine UMAT. The results show that the predicted results of A-V model are lower than the experimental data, and the A-V model is difficult to control ratcheting strain rate. In order to improve the predictive ability of the A-V model, the parameter γ2 of the A-V model is modified using the isotropic hardening criterion, and the extended A-V model is proposed. Comparing the predicted results of the above two models with the experimental data, it is shown that the prediction results of the extended A-V model are in good agreement with the experimental data.

Keywords

Acknowledgement

This work was partly supported by the Natural Science Foundation of Hebei Province of China (No. E2021501011), Central University Basic Scientific Research Business Expenses (No. N2123028).

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