Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness
The fatigue strength and fatigue life of high-strength steels are greatly affected by their surface roughness. This study investigates the underlying mechanisms responsible for fatigue failure of the high-strength steel 42CrMo. Bending fatigue tests of stepped shafts with different levels of surface...
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| Format: | Article |
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MDPI AG
2021-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/18/5420 |
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| author | Xiaochun Zhu Zhurong Dong Yachen Zhang Zhengkun Cheng |
| author_facet | Xiaochun Zhu Zhurong Dong Yachen Zhang Zhengkun Cheng |
| author_sort | Xiaochun Zhu |
| collection | DOAJ |
| description | The fatigue strength and fatigue life of high-strength steels are greatly affected by their surface roughness. This study investigates the underlying mechanisms responsible for fatigue failure of the high-strength steel 42CrMo. Bending fatigue tests of stepped shafts with different levels of surface roughness were conducted to observe the fatigue live reduction affected by surface topography. Besides, the mechanical properties of 42CrMo and its strain–life relationship were established. Moreover, the analytical formulas to describe the stress concentration factor (SCF) and fatigue notch factor (FNF) induced by surface topography were introduced. To estimate the fatigue life of machined specimens with the consideration of surface roughness, the elastic portion of the total strain–life curve of the material was revised with the proposed analytical FNF imposed by surface topography. Comparisons between the estimated fatigue lives and experimentally obtained fatigue lives show that the effect of surface roughness on fatigue lives could be estimated effectively and conveniently by the proposed procedure. |
| first_indexed | 2024-03-10T07:29:26Z |
| format | Article |
| id | doaj.art-e432de754fbf45eda72da644c31ab419 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T07:29:26Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-e432de754fbf45eda72da644c31ab4192023-11-22T14:03:47ZengMDPI AGMaterials1996-19442021-09-011418542010.3390/ma14185420Fatigue Life Prediction of Machined Specimens with the Consideration of Surface RoughnessXiaochun Zhu0Zhurong Dong1Yachen Zhang2Zhengkun Cheng3School of Automotive and Transportation Engineering, Shenzhen Polytechnic, Shenzhen 518055, ChinaSchool of Automotive and Transportation Engineering, Shenzhen Polytechnic, Shenzhen 518055, ChinaSchool of Automotive and Transportation Engineering, Shenzhen Polytechnic, Shenzhen 518055, ChinaSchool of Automotive and Transportation Engineering, Shenzhen Polytechnic, Shenzhen 518055, ChinaThe fatigue strength and fatigue life of high-strength steels are greatly affected by their surface roughness. This study investigates the underlying mechanisms responsible for fatigue failure of the high-strength steel 42CrMo. Bending fatigue tests of stepped shafts with different levels of surface roughness were conducted to observe the fatigue live reduction affected by surface topography. Besides, the mechanical properties of 42CrMo and its strain–life relationship were established. Moreover, the analytical formulas to describe the stress concentration factor (SCF) and fatigue notch factor (FNF) induced by surface topography were introduced. To estimate the fatigue life of machined specimens with the consideration of surface roughness, the elastic portion of the total strain–life curve of the material was revised with the proposed analytical FNF imposed by surface topography. Comparisons between the estimated fatigue lives and experimentally obtained fatigue lives show that the effect of surface roughness on fatigue lives could be estimated effectively and conveniently by the proposed procedure.https://www.mdpi.com/1996-1944/14/18/5420bending fatigue testsurface roughnessfatigue notch factorfatigue life prediction |
| spellingShingle | Xiaochun Zhu Zhurong Dong Yachen Zhang Zhengkun Cheng Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness Materials bending fatigue test surface roughness fatigue notch factor fatigue life prediction |
| title | Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness |
| title_full | Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness |
| title_fullStr | Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness |
| title_full_unstemmed | Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness |
| title_short | Fatigue Life Prediction of Machined Specimens with the Consideration of Surface Roughness |
| title_sort | fatigue life prediction of machined specimens with the consideration of surface roughness |
| topic | bending fatigue test surface roughness fatigue notch factor fatigue life prediction |
| url | https://www.mdpi.com/1996-1944/14/18/5420 |
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