Modified Abdel-Karim-Ohno Model and Ratcheting Effect Prediction of Z2CDN18.12N Stainless Steel

doi:10.12068/j.issn.1005-3026.2023.03.012

Abstract

Abstract: In order to better describe the uniaxial ratcheting behavior of Z2CDN18.12N austenitic stainless steel， the Abdel-Karim-Ohno model was improved under the framework of the unified viscoplastic cyclic constitutive theory. By introducing a plastic strain memory surface into the isotropic hardening rule， the model parameters were determined. Further， the Abdel-Karim-Ohno model and the improved Abdel-Karim-Ohno model were used to predict the uniaxial ratcheting effect behavior of Z2CDN18.12N austenitic stainless steel at the room temperature. The influences of mean stress， stress amplitude， stress rate and loading history on the uniaxial ratcheting strain of Z2CDN18.12N austenitic stainless steel were studied by the two models， respectively. The uniaxial ratcheting strain level increased with the increasing mean stress and stress amplitude， decreased with the increasing stress rate， being more sensitive to the lower stress rate， and the loading history had great influence on the ratcheting behavior. Comparison of the prediction results of the two models with the experimental data proved the effectiveness of the improved model.

Key words: ratcheting effect; plastic strain memory surface; Abdel-Karim-Ohno model; isotropic hardening; kinematic hardening

CLC Number:

CHEN Xiao-hui， LIU Ming-yue， LIU Shi-ji， TIAN Yu-song. Modified Abdel-Karim-Ohno Model and Ratcheting Effect Prediction of Z2CDN18.12N Stainless Steel[J]. Journal of Northeastern University(Natural Science), 2023, 44(3): 392-398.

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