Improved Model Based on A-V Model and Prediction of Uniaxial Ratcheting Effects

doi:10.12068/j.issn.1005-3026.2021.01.013

Abstract

Abstract: In view of the shortcomings of the A-V model which cannot well predict the initial stage of ratcheting effect of materials， the parameter γ₂ in the A-V model was modified and Ramberg-Osgood (R-O) model and isotropic hardening were introduced to calculate the stress-strain curve. The material parameters of the A-V model were determined， and an improved A-V model was established to describe the cyclic plastic behavior of materials. The uniaxial ratcheting effects of Z2CND18.12N austenitic stainless steel and SS316L steel were predicted by using the improved A-V model， and the influences of average stress， stress amplitude， stress ratio and loading history on the uniaxial ratcheting effect were studied. The results showed that the ratcheting strain predicted by the improved A-V model is consistent with the experimental value.

Key words: metallic material; uniaxial ratcheting effect; A-V constitutive model; Ramberg-Osgood model; isotropic hardening

CLC Number:

CHEN Xiao-hui， ZHOU Yang， LIU Ming-yue， LIN Yong-cheng. Improved Model Based on A-V Model and Prediction of Uniaxial Ratcheting Effects[J]. Journal of Northeastern University(Natural Science), 2021, 42(1): 83-90.

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