Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load
Offshore structures often suffer from pitting corrosion, which leads to local stress concentrations, a decrease in the cross-sectional area, the subsequent initiation and gradual propagation of cracks, and a shorter service life as a result. This study aims to investigate the impact of pitting corro...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/11/1839 |
| _version_ | 1797458393914408960 |
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| author | Xueshu Liu Bingrong Yan Hongtu Sun |
| author_facet | Xueshu Liu Bingrong Yan Hongtu Sun |
| author_sort | Xueshu Liu |
| collection | DOAJ |
| description | Offshore structures often suffer from pitting corrosion, which leads to local stress concentrations, a decrease in the cross-sectional area, the subsequent initiation and gradual propagation of cracks, and a shorter service life as a result. This study aims to investigate the impact of pitting corrosion on the fatigue life endurance of high-strength steel used for offshore structures. To this end, a three-point bending fatigue test was first performed on the specimens to obtain the fatigue test data. Then, a fatigue life prediction model consisting of two terms is proposed based on fracture mechanics, and the fatigue test data are used to verify the reliability of the model. Finally, the experimental results are discussed, and conclusions are drawn. The first term was designed for crack initiation. Combining with the energy theory and slip band dislocation theory, a novel equivalent surface defect model was proposed and used to predict the fatigue life of pitted corroded specimens before crack initiation. The second term is designed for crack propagation. The generalized Paris model is adopted for fatigue life prediction during the crack propagation process after the crack angle is taken as a variable. The mathematical model for predicting three-point bending fatigue life was finally obtained, and the average relative error of the data validation results did not exceed 16%, which proved the reliability of the prediction model. |
| first_indexed | 2024-03-09T16:37:27Z |
| format | Article |
| id | doaj.art-af257733b61b43a2aad78c316910a2dc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:37:27Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-af257733b61b43a2aad78c316910a2dc2023-11-24T14:55:48ZengMDPI AGMetals2075-47012023-11-011311183910.3390/met13111839Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending LoadXueshu Liu0Bingrong Yan1Hongtu Sun2School of Automotive Engineering, Dalian University of Technology, Dalian 116024, ChinaSchool of Automotive Engineering, Dalian University of Technology, Dalian 116024, ChinaUlsan Ship and Ocean College, Ludong University, Yantai 264025, ChinaOffshore structures often suffer from pitting corrosion, which leads to local stress concentrations, a decrease in the cross-sectional area, the subsequent initiation and gradual propagation of cracks, and a shorter service life as a result. This study aims to investigate the impact of pitting corrosion on the fatigue life endurance of high-strength steel used for offshore structures. To this end, a three-point bending fatigue test was first performed on the specimens to obtain the fatigue test data. Then, a fatigue life prediction model consisting of two terms is proposed based on fracture mechanics, and the fatigue test data are used to verify the reliability of the model. Finally, the experimental results are discussed, and conclusions are drawn. The first term was designed for crack initiation. Combining with the energy theory and slip band dislocation theory, a novel equivalent surface defect model was proposed and used to predict the fatigue life of pitted corroded specimens before crack initiation. The second term is designed for crack propagation. The generalized Paris model is adopted for fatigue life prediction during the crack propagation process after the crack angle is taken as a variable. The mathematical model for predicting three-point bending fatigue life was finally obtained, and the average relative error of the data validation results did not exceed 16%, which proved the reliability of the prediction model.https://www.mdpi.com/2075-4701/13/11/1839fatigue lifepitting corrosionthree-point bendingequivalent surface defect |
| spellingShingle | Xueshu Liu Bingrong Yan Hongtu Sun Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load Metals fatigue life pitting corrosion three-point bending equivalent surface defect |
| title | Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load |
| title_full | Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load |
| title_fullStr | Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load |
| title_full_unstemmed | Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load |
| title_short | Fatigue Life Prediction of High Strength Steel with Pitting Corrosion under Three-Point Bending Load |
| title_sort | fatigue life prediction of high strength steel with pitting corrosion under three point bending load |
| topic | fatigue life pitting corrosion three-point bending equivalent surface defect |
| url | https://www.mdpi.com/2075-4701/13/11/1839 |
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