Steel and Composite Structures

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Multiaxial ratcheting assessment of Z2CND18.12N steel using modified A-V hardening rule

  • Xiaohui Chen (School of Control Engineering, Northeastern University at Qinhuangdao) ;
  • Yang Zhou (School of Control Engineering, Northeastern University at Qinhuangdao) ;
  • Wenwu Liu (School of Control Engineering, Northeastern University at Qinhuangdao) ;
  • Xu Zhao (School of Control Engineering, Northeastern University at Qinhuangdao)
  • Received : 2021.08.02
  • Accepted : 2023.07.11
  • Published : 2023.10.10
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Abstract

Based on Ahmadzadeh-Varvani hardening rule (A-V model), multiaxial ratcheting effect of Z2CND18.12N austenitic stainless steel is simulated by ABAQUS with user subroutine UMAT. The results show that the predicted results of the origin multiaxial A-V model are lower than the experimental data, and it is difficult to control ratcheting strain rate. In order to improve the predicted capability of A-V model, the A-V model is modified. In this study. Moreover, under the assumption of the von Mises yield criterion and normal plasticity flow rule, we develop a numerical algorithm of plastic strain with the improved model to implement the finite element calculation of the model. Internal iteration in the numerical algorithm was implemented with the Euler backward method, which calculated the trial strain for each equilibrium iteration using the consistent tangent matrix. With a user subroutine, the proposed model is programmed into ABAQUS for a user - executable version. By simulating the uniaxial ratcheting of a round bar made of Z2CND18.12N austenitic stainless steel, we observe that the predicted results simulated by ABAQUS with UMAT are compared with the experimental data. The predicted results of the improved multiaxial A-V model are consistent well 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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