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Strain-controlled low-cycle fatigue behavior of a superalloy considering extensive temperature range and stress concentration
  • +3
  • Lingying Luo,
  • Wenjun Wang,
  • Qinzheng Yang,
  • Dong Mi,
  • Xu Wang,
  • Xiaoan HU
Lingying Luo
Nanchang Hangkong University
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Wenjun Wang
China Aviation Power Machinery Research Institute
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Qinzheng Yang
Nanchang Hangkong University

Corresponding Author:qinzhengyang@nchu.edu.cn

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Dong Mi
China Aviation Power Machinery Research Institute
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Xu Wang
China Aviation Power Machinery Research Institute
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Xiaoan HU
Nanchang Hangkong University
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Abstract

This study aims to investigate the low cycle fatigue (LCF) behavior and fatigue life prediction method of an advanced solid solution strengthened nickel-based superalloy at various temperatures and stress concentrations. Cylindrical specimens as well as plates with three types of holes (including straight holes and inclined holes with different orientations) were designed and machined for fatigue tests. The test results revealed fatigue life decreases with the temperature increasing. Meanwhile, the fatigue lives of the plate specimens have decreased differently and are strongly dependent on the geometry and orientation of the holes. The key damage parameter related to the fatigue life was found on the strain gradient path. A criterion based on strain gradient is defined as the boundary of the damage process zone. The results show that the prediction was in good agreement with the experimental data, for the majority of the data is within a scatter band of ±2.
10 May 2024Submission Checks Completed
10 May 2024Assigned to Editor
19 May 2024Reviewer(s) Assigned
29 Jun 2024Review(s) Completed, Editorial Evaluation Pending
30 Jul 20241st Revision Received