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High‐Temperature, Low‐Cycle, Stress‐Controlled Fatigue Testing and Life Prediction of P92 and IN718 Incorporating Ratcheting and Notch Effects.

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Title: High‐Temperature, Low‐Cycle, Stress‐Controlled Fatigue Testing and Life Prediction of P92 and IN718 Incorporating Ratcheting and Notch Effects.
Authors: Hua, Fei‐Long1 (AUTHOR), Shu, Yang1 (AUTHOR), Wang, Kang‐Kang1,2 (AUTHOR), Yan, Jing‐Bo3 (AUTHOR), Liu, Peng3 (AUTHOR), Fan, Kai‐Fa3 (AUTHOR), Ye, Ting4 (AUTHOR), Wen, Jian‐Feng1,4,5 (AUTHOR) jfwen@ecust.edu.cn, Zhang, Xian‐Cheng1,5 (AUTHOR), Tu, Shan‐Tung1,5 (AUTHOR)
Source: Fatigue & Fracture of Engineering Materials & Structures. Aug2026, Vol. 49 Issue 8, p3359-3377. 19p.
Subjects: Fatigue life, Notch effect, Heat resistant steel, Fatigue testing machines, Inconel, Material plasticity
Abstract: Accurate fatigue life prediction is critical for structural integrity assessment, typically requiring simultaneous consideration of the coupled effects of low‐cycle fatigue (LCF) and ratcheting. In this study, asymmetric stress‐controlled LCF tests were conducted on smooth and notched specimens of P92 at 600°C and IN718 at 650°C. It was found that the notched specimens exhibited significantly lower overall ratcheting strain than the smooth specimens, attributed to notch‐root stress support. Traditional approaches (e.g., the Manson–Coffin model) show noticeable discrepancies for notched components under asymmetric cyclic loading because ratcheting and notch effects are typically neglected. Based on a damage‐evolution framework, a fatigue life model incorporating a stress gradient factor is proposed to account for notch influence. The resulting predictions for all cases fall within the ±2 scatter band, indicating a substantial improvement in predictive accuracy. Summary: Stress‐controlled LCF tests were performed on smooth and notched P92 and IN718 specimens.Notched specimens exhibit reduced ratcheting and increased fatigue features.An energy‐based model is proposed to quantify both fatigue and ratcheting damage.The proposed model predicts fatigue lives within a ±2× scatter band. [ABSTRACT FROM AUTHOR]
Copyright of Fatigue & Fracture of Engineering Materials & Structures is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 195038590
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: High‐Temperature, Low‐Cycle, Stress‐Controlled Fatigue Testing and Life Prediction of P92 and IN718 Incorporating Ratcheting and Notch Effects.
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  Data: <searchLink fieldCode="AR" term="%22Hua%2C+Fei‐Long%22">Hua, Fei‐Long</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shu%2C+Yang%22">Shu, Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Kang‐Kang%22">Wang, Kang‐Kang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Jing‐Bo%22">Yan, Jing‐Bo</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Peng%22">Liu, Peng</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fan%2C+Kai‐Fa%22">Fan, Kai‐Fa</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ye%2C+Ting%22">Ye, Ting</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wen%2C+Jian‐Feng%22">Wen, Jian‐Feng</searchLink><relatesTo>1,4,5</relatesTo> (AUTHOR)<i> jfwen@ecust.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Xian‐Cheng%22">Zhang, Xian‐Cheng</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tu%2C+Shan‐Tung%22">Tu, Shan‐Tung</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Fatigue+%26+Fracture+of+Engineering+Materials+%26+Structures%22">Fatigue & Fracture of Engineering Materials & Structures</searchLink>. Aug2026, Vol. 49 Issue 8, p3359-3377. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Fatigue+life%22">Fatigue life</searchLink><br /><searchLink fieldCode="DE" term="%22Notch+effect%22">Notch effect</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+resistant+steel%22">Heat resistant steel</searchLink><br /><searchLink fieldCode="DE" term="%22Fatigue+testing+machines%22">Fatigue testing machines</searchLink><br /><searchLink fieldCode="DE" term="%22Inconel%22">Inconel</searchLink><br /><searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Accurate fatigue life prediction is critical for structural integrity assessment, typically requiring simultaneous consideration of the coupled effects of low‐cycle fatigue (LCF) and ratcheting. In this study, asymmetric stress‐controlled LCF tests were conducted on smooth and notched specimens of P92 at 600°C and IN718 at 650°C. It was found that the notched specimens exhibited significantly lower overall ratcheting strain than the smooth specimens, attributed to notch‐root stress support. Traditional approaches (e.g., the Manson–Coffin model) show noticeable discrepancies for notched components under asymmetric cyclic loading because ratcheting and notch effects are typically neglected. Based on a damage‐evolution framework, a fatigue life model incorporating a stress gradient factor is proposed to account for notch influence. The resulting predictions for all cases fall within the ±2 scatter band, indicating a substantial improvement in predictive accuracy. Summary: Stress‐controlled LCF tests were performed on smooth and notched P92 and IN718 specimens.Notched specimens exhibit reduced ratcheting and increased fatigue features.An energy‐based model is proposed to quantify both fatigue and ratcheting damage.The proposed model predicts fatigue lives within a ±2× scatter band. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Fatigue & Fracture of Engineering Materials & Structures is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/ffe.70319
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      – Code: eng
        Text: English
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        PageCount: 19
        StartPage: 3359
    Subjects:
      – SubjectFull: Fatigue life
        Type: general
      – SubjectFull: Notch effect
        Type: general
      – SubjectFull: Heat resistant steel
        Type: general
      – SubjectFull: Fatigue testing machines
        Type: general
      – SubjectFull: Inconel
        Type: general
      – SubjectFull: Material plasticity
        Type: general
    Titles:
      – TitleFull: High‐Temperature, Low‐Cycle, Stress‐Controlled Fatigue Testing and Life Prediction of P92 and IN718 Incorporating Ratcheting and Notch Effects.
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            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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