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<p>This study investigates the ratcheting–fatigue interaction of SA508 and SA333 steel samples subjected to uniaxial asymmetric stress cycles at various operating temperatures. The hardening framework consisted of the Lee–Zavrel (L-Z) isotropic description coupled with the Ahmadzadeh-Varvani (A-V) kinematic hardening rule. The kinematic hardening model was employed to assess the ratcheting of steel samples at the temperature range of 473–623&#xa0;K in the presence of the dynamic strain aging (DSA) phenomenon. The damage term <i>D</i> was introduced in both linear and dynamic recovery terms of the kinematic hardening model to account for damage accumulated through loading cycles. Damage values due to ratcheting and fatigue phenomena were defined, respectively, through lower and upper bounds. The upper bound presented the fatigue response of steel samples in the absence of ratcheting, and the lower bound was constructed from ratcheting damage values plotted versus the number of stress cycles. The damage values through ratcheting and fatigue phenomena were accumulated to predict the life of steel samples at various cyclic stress levels and operating temperatures.</p>

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Ratcheting–Fatigue Interaction in SA508 and SA333 Steels Subjected to Uniaxial Asymmetric Stress Cycles at Room and Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • M. Karimi,
  • A. Varvani-Farahani

摘要

This study investigates the ratcheting–fatigue interaction of SA508 and SA333 steel samples subjected to uniaxial asymmetric stress cycles at various operating temperatures. The hardening framework consisted of the Lee–Zavrel (L-Z) isotropic description coupled with the Ahmadzadeh-Varvani (A-V) kinematic hardening rule. The kinematic hardening model was employed to assess the ratcheting of steel samples at the temperature range of 473–623 K in the presence of the dynamic strain aging (DSA) phenomenon. The damage term D was introduced in both linear and dynamic recovery terms of the kinematic hardening model to account for damage accumulated through loading cycles. Damage values due to ratcheting and fatigue phenomena were defined, respectively, through lower and upper bounds. The upper bound presented the fatigue response of steel samples in the absence of ratcheting, and the lower bound was constructed from ratcheting damage values plotted versus the number of stress cycles. The damage values through ratcheting and fatigue phenomena were accumulated to predict the life of steel samples at various cyclic stress levels and operating temperatures.