Indentation effect on the fatigue limit of axle steel
A hardness tester was used to make indentations on the hourglass fatigue specimens of axle steel,and notches were machined by electronic discharge machining(EDM).The fatigue limits of both indentation specimens and notched ones were examined and compared with the theoretical values according to the...
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Science Press
2016-06-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.06.012 |
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| author | GAO Jie-wei DAI Guang-ze ZHAO Jun-wen LI Heng-kui XU Lei |
| author_facet | GAO Jie-wei DAI Guang-ze ZHAO Jun-wen LI Heng-kui XU Lei |
| author_sort | GAO Jie-wei |
| collection | DOAJ |
| description | A hardness tester was used to make indentations on the hourglass fatigue specimens of axle steel,and notches were machined by electronic discharge machining(EDM).The fatigue limits of both indentation specimens and notched ones were examined and compared with the theoretical values according to the Murakami formula based on material hardness and defect projected area.The fracture surface was observed by scanning electron microscopy.It is found that local work hardening and residual stress caused by plastic deformation of indentations have no significant effect on the fatigue limits in comparison with the predicted values by the Murakami equation.Fatigue cracks originate from the bottom of indentations due to stress concentration effect.The fatigue limits of notched specimens are lower than the calculated values because of secondary notches caused by the high roughness of notch surfaces and the existence of microcracks and micropores within the re-cast layers.Cracks initiate from multiple sites on the bottom of electronic discharge machining notches. |
| format | Article |
| id | doaj-art-7ec09dcd01e44fa59c2e6fc80f82caf2 |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2016-06-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-7ec09dcd01e44fa59c2e6fc80f82caf22025-08-20T01:47:51ZzhoScience Press工程科学学报2095-93892016-06-0138682783310.13374/j.issn2095-9389.2016.06.012Indentation effect on the fatigue limit of axle steelGAO Jie-wei0DAI Guang-ze1ZHAO Jun-wen2LI Heng-kui3XU Lei41. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China;2. CSR Qingdao Sifang Co., Ltd., Qingdao 266111, China;3. School of Materials Science and Engineering, Xihua University, Chengdu 610039, ChinaA hardness tester was used to make indentations on the hourglass fatigue specimens of axle steel,and notches were machined by electronic discharge machining(EDM).The fatigue limits of both indentation specimens and notched ones were examined and compared with the theoretical values according to the Murakami formula based on material hardness and defect projected area.The fracture surface was observed by scanning electron microscopy.It is found that local work hardening and residual stress caused by plastic deformation of indentations have no significant effect on the fatigue limits in comparison with the predicted values by the Murakami equation.Fatigue cracks originate from the bottom of indentations due to stress concentration effect.The fatigue limits of notched specimens are lower than the calculated values because of secondary notches caused by the high roughness of notch surfaces and the existence of microcracks and micropores within the re-cast layers.Cracks initiate from multiple sites on the bottom of electronic discharge machining notches.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.06.012axle steelfatigue behaviorindentationnotchesstress concentration |
| spellingShingle | GAO Jie-wei DAI Guang-ze ZHAO Jun-wen LI Heng-kui XU Lei Indentation effect on the fatigue limit of axle steel 工程科学学报 axle steel fatigue behavior indentation notches stress concentration |
| title | Indentation effect on the fatigue limit of axle steel |
| title_full | Indentation effect on the fatigue limit of axle steel |
| title_fullStr | Indentation effect on the fatigue limit of axle steel |
| title_full_unstemmed | Indentation effect on the fatigue limit of axle steel |
| title_short | Indentation effect on the fatigue limit of axle steel |
| title_sort | indentation effect on the fatigue limit of axle steel |
| topic | axle steel fatigue behavior indentation notches stress concentration |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.06.012 |
| work_keys_str_mv | AT gaojiewei indentationeffectonthefatiguelimitofaxlesteel AT daiguangze indentationeffectonthefatiguelimitofaxlesteel AT zhaojunwen indentationeffectonthefatiguelimitofaxlesteel AT lihengkui indentationeffectonthefatiguelimitofaxlesteel AT xulei indentationeffectonthefatiguelimitofaxlesteel |