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Experimental Study on Bending Fatigue Performance of ADI Gears Under Different Applied Load Levels.

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Title: Experimental Study on Bending Fatigue Performance of ADI Gears Under Different Applied Load Levels.
Authors: Wang, Lijun1 (AUTHOR), Wei, Hui1,2 (AUTHOR), Ho, Hsinshen2,3 (AUTHOR), Hu, Bo1,2 (AUTHOR), Li, Yangyang1,2 (AUTHOR), Wang, Dongfei3 (AUTHOR) wdf2866@sina.com
Source: Materials (1996-1944). Aug2025, Vol. 18 Issue 16, p3922. 20p.
Subjects: Fatigue limit, Microhardness testing, Nodular iron, Metallography, Gearing machinery, Cyclic fatigue, Strains & stresses (Mechanics), Alloy fatigue
Abstract: As austempered ductile iron (ADI) is a key gear material for meeting the lightweight and cost-effective demands of new energy vehicles, its bending fatigue performance has a direct impact on vehicle transmission efficiency. In the present work, QTD 800 gears were subjected to bending fatigue testing using a combination of the conventional group method and the staircase method, with considerations given to fatigue life and fatigue limit at different reliability levels. Subsequently, the gears were characterized using optical microscopy and a microhardness tester to examine their metallographic structure and determine their hardness. The results indicate that the bending fatigue limits corresponding to gear reliability levels of 50%, 90%, and 99% are 390.00 MPa, 372.55 MPa, and 358.32 MPa, respectively. It was also observed that higher gear life stability corresponds to a lower sustainable fatigue limit stress. The analyses further reveal that under low loads, the main crack exhibits a relatively straight and smooth propagation trajectory, formed through the slow extension of an existing crack, whereas under high loads, the main crack displays a rough and serrated appearance, arising from the coalescence of microcracks initiated around graphite nodules. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI 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.)
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An: 187615055
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  Label: Title
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  Data: Experimental Study on Bending Fatigue Performance of ADI Gears Under Different Applied Load Levels.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Lijun%22">Wang, Lijun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wei%2C+Hui%22">Wei, Hui</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ho%2C+Hsinshen%22">Ho, Hsinshen</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hu%2C+Bo%22">Hu, Bo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Yangyang%22">Li, Yangyang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Dongfei%22">Wang, Dongfei</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> wdf2866@sina.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Aug2025, Vol. 18 Issue 16, p3922. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Fatigue+limit%22">Fatigue limit</searchLink><br /><searchLink fieldCode="DE" term="%22Microhardness+testing%22">Microhardness testing</searchLink><br /><searchLink fieldCode="DE" term="%22Nodular+iron%22">Nodular iron</searchLink><br /><searchLink fieldCode="DE" term="%22Metallography%22">Metallography</searchLink><br /><searchLink fieldCode="DE" term="%22Gearing+machinery%22">Gearing machinery</searchLink><br /><searchLink fieldCode="DE" term="%22Cyclic+fatigue%22">Cyclic fatigue</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Alloy+fatigue%22">Alloy fatigue</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: As austempered ductile iron (ADI) is a key gear material for meeting the lightweight and cost-effective demands of new energy vehicles, its bending fatigue performance has a direct impact on vehicle transmission efficiency. In the present work, QTD 800 gears were subjected to bending fatigue testing using a combination of the conventional group method and the staircase method, with considerations given to fatigue life and fatigue limit at different reliability levels. Subsequently, the gears were characterized using optical microscopy and a microhardness tester to examine their metallographic structure and determine their hardness. The results indicate that the bending fatigue limits corresponding to gear reliability levels of 50%, 90%, and 99% are 390.00 MPa, 372.55 MPa, and 358.32 MPa, respectively. It was also observed that higher gear life stability corresponds to a lower sustainable fatigue limit stress. The analyses further reveal that under low loads, the main crack exhibits a relatively straight and smooth propagation trajectory, formed through the slow extension of an existing crack, whereas under high loads, the main crack displays a rough and serrated appearance, arising from the coalescence of microcracks initiated around graphite nodules. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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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        Value: 10.3390/ma18163922
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      – Code: eng
        Text: English
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        PageCount: 20
        StartPage: 3922
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      – SubjectFull: Fatigue limit
        Type: general
      – SubjectFull: Microhardness testing
        Type: general
      – SubjectFull: Nodular iron
        Type: general
      – SubjectFull: Metallography
        Type: general
      – SubjectFull: Gearing machinery
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      – SubjectFull: Cyclic fatigue
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Alloy fatigue
        Type: general
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      – TitleFull: Experimental Study on Bending Fatigue Performance of ADI Gears Under Different Applied Load Levels.
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            NameFull: Wang, Lijun
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            NameFull: Hu, Bo
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            NameFull: Li, Yangyang
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              M: 08
              Text: Aug2025
              Type: published
              Y: 2025
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              Value: 18
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