Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method
Mechanical behaviors at fatigue crack tips of cracked specimens under negative loading ratios are studied in detail by the finite element method in this paper. Three factors induced by specimen type and loading type on fatigue crack field are discussed, including constraint, compressive loading effe...
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| Format: | Article |
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MDPI AG
2022-10-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/11/1858 |
| _version_ | 1797467228138897408 |
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| author | Xinting Miao Haisheng Hong Xinyi Hong Jian Peng Fengfeng Bie |
| author_facet | Xinting Miao Haisheng Hong Xinyi Hong Jian Peng Fengfeng Bie |
| author_sort | Xinting Miao |
| collection | DOAJ |
| description | Mechanical behaviors at fatigue crack tips of cracked specimens under negative loading ratios are studied in detail by the finite element method in this paper. Three factors induced by specimen type and loading type on fatigue crack field are discussed, including constraint, compressive loading effect (CL effect) and crack contact closure. For mode I crack under negative loading ratios, the effects of the CL effect and crack contact closure on plastic strain accumulations are dominant, with the constraint effect being minor. The constraint effect has effects on the monotonous plastic zone, while the CL effect and contact closure both have effects on the reversed plastic zone (RPZ) and residual tensile plastic zone (RTPZ). That is, the higher the constraint, the smaller the size of the monotonous plastic zone; the greater the CL effect, or the smaller the contact degree, the larger the size of RPZ and RTPZ. For mode II crack, there is only CL effect on the crack tip field without the effect of constraint and contact closure, so plastic strain accumulation at the mode II crack tip is much greater than that at the mode I crack tip when they are under the same loading level. |
| first_indexed | 2024-03-09T18:50:42Z |
| format | Article |
| id | doaj.art-390572446af546f0a395bbf9f565428b |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T18:50:42Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-390572446af546f0a395bbf9f565428b2023-11-24T05:52:16ZengMDPI AGMetals2075-47012022-10-011211185810.3390/met12111858Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element MethodXinting Miao0Haisheng Hong1Xinyi Hong2Jian Peng3Fengfeng Bie4School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, ChinaSchool of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, ChinaSchool of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, ChinaSchool of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, ChinaSchool of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, ChinaMechanical behaviors at fatigue crack tips of cracked specimens under negative loading ratios are studied in detail by the finite element method in this paper. Three factors induced by specimen type and loading type on fatigue crack field are discussed, including constraint, compressive loading effect (CL effect) and crack contact closure. For mode I crack under negative loading ratios, the effects of the CL effect and crack contact closure on plastic strain accumulations are dominant, with the constraint effect being minor. The constraint effect has effects on the monotonous plastic zone, while the CL effect and contact closure both have effects on the reversed plastic zone (RPZ) and residual tensile plastic zone (RTPZ). That is, the higher the constraint, the smaller the size of the monotonous plastic zone; the greater the CL effect, or the smaller the contact degree, the larger the size of RPZ and RTPZ. For mode II crack, there is only CL effect on the crack tip field without the effect of constraint and contact closure, so plastic strain accumulation at the mode II crack tip is much greater than that at the mode I crack tip when they are under the same loading level.https://www.mdpi.com/2075-4701/12/11/1858over-bend straighteningmold-press straighteningroll-press straighteningprediction modelinitial curvaturestraightening moment |
| spellingShingle | Xinting Miao Haisheng Hong Xinyi Hong Jian Peng Fengfeng Bie Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method Metals over-bend straightening mold-press straightening roll-press straightening prediction model initial curvature straightening moment |
| title | Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method |
| title_full | Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method |
| title_fullStr | Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method |
| title_full_unstemmed | Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method |
| title_short | Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method |
| title_sort | effect of constraint and crack contact closure on fatigue crack mechanical behavior of specimen under negative loading ratio by finite element method |
| topic | over-bend straightening mold-press straightening roll-press straightening prediction model initial curvature straightening moment |
| url | https://www.mdpi.com/2075-4701/12/11/1858 |
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