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Influence of Pre-Strain on the Course of Energy Dissipation and Durability in Low-Cycle Fatigue.

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Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens.

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Predicting Low-Cycle Fatigue Life Using New Energy-Based Fatigue Damage Measures.

Stanisław Mroziński1, Michał Piotrowski1, Władysław Egner2

  • 1Faculty of Mechanical Engineering, Bydgoszcz University of Science and Technology, Al. Prof. S. Kaliskiego 7, 85-796 Bydgoszcz, Poland.

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Summary
This summary is machine-generated.

This study explores energy-based methods for predicting low-cycle fatigue life in S420M steel. Anisotropy significantly reduces fatigue life, with energy-based predictions often overestimating experimental results.

Keywords:
anisotropyenergy-based fatigue descriptionlow-cycle fatigueunified mechanics theory

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Fatigue Analysis

Background:

  • Low-cycle fatigue is critical for structural integrity.
  • Predicting fatigue life is essential for material design.
  • Anisotropy in materials can significantly affect fatigue behavior.

Purpose of the Study:

  • To evaluate new energy-based fatigue damage measures for predicting low-cycle fatigue life.
  • To compare empirical (Palmgren-Miner) and thermodynamic (Unified Mechanics Theory) approaches.
  • To investigate the influence of anisotropy on the fatigue response of S420M steel.

Main Methods:

  • Utilized energy accumulation graphs as a generalization of isodamage lines.
  • Compared empirical Palmgren-Miner hypothesis with Unified Mechanics Theory.
  • Tested S420M steel samples in orientations parallel and perpendicular to the rolling direction.
  • Conducted microstructural analysis to observe anisotropy effects.

Main Results:

  • Fatigue life of samples perpendicular to the rolling direction was lower than parallel samples.
  • Microstructural analysis revealed banded structures in perpendicular samples due to anisotropy.
  • Calculated fatigue life using Palmgren-Miner consistently exceeded experimental fatigue life.
  • Unit loop energy was higher in parallel samples compared to perpendicular samples across all strain amplitudes.

Conclusions:

  • Energy-based methods show potential but require refinement for accurate fatigue life prediction, especially with anisotropy.
  • Anisotropy, induced by sheet rolling, significantly degrades fatigue performance.
  • The empirical Palmgren-Miner hypothesis tends to overestimate fatigue life in this context.