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<p>This work considers life-prediction models for metals subjected to low-cycle nonproportional multiaxial loading. We propose a modification of the Fatemi–Socie model that introduces an additional parameter accounting for rotation of the principal stress axes and material sensitivity to nonproportional loading. Baseline experiments used to establish the model parameters are strain-controlled fatigue tests in axial tension–compression, fully reversed torsion, and nonproportional loading with a 90° phase shift. Validation of the approach was performed by comparing predictions with a set of experimental data published in the literature. In particular, the dataset includes results for eight metallic alloys under four nonproportional paths. A comparative analysis with the Fatemi–Socie and Itoh et al. models is presented. In addition, we consider a variant that does not require the baseline 90° out-of-phase test, making the model more accessible for engineering use. Both variants of the new model provide reliable life predictions for all investigated materials and improve prediction accuracy under nonproportional loading.</p>

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Criterion for Evaluating the Fatigue Life of Metals Under Multiaxial Low-Cycle Fatigue with Nonproportional Loading Paths

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • E. V. Savchuk,
  • S. M. Shukayev

摘要

This work considers life-prediction models for metals subjected to low-cycle nonproportional multiaxial loading. We propose a modification of the Fatemi–Socie model that introduces an additional parameter accounting for rotation of the principal stress axes and material sensitivity to nonproportional loading. Baseline experiments used to establish the model parameters are strain-controlled fatigue tests in axial tension–compression, fully reversed torsion, and nonproportional loading with a 90° phase shift. Validation of the approach was performed by comparing predictions with a set of experimental data published in the literature. In particular, the dataset includes results for eight metallic alloys under four nonproportional paths. A comparative analysis with the Fatemi–Socie and Itoh et al. models is presented. In addition, we consider a variant that does not require the baseline 90° out-of-phase test, making the model more accessible for engineering use. Both variants of the new model provide reliable life predictions for all investigated materials and improve prediction accuracy under nonproportional loading.