Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates
Laser peening without coating (LPwC) is a well-known technique to improve high-cycle fatigue properties by introducing compressive residual stress (RS) near the surface of metal components. In this study, X-ray diffraction (XRD) and flexural fatigue tests were applied to pre-cracked 12 mm thick SM49...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Forces in Mechanics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666359723000690 |
| _version_ | 1797390406717014016 |
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| author | Tomoharu Kato Yoshihiro Sakino Yuji Sano |
| author_facet | Tomoharu Kato Yoshihiro Sakino Yuji Sano |
| author_sort | Tomoharu Kato |
| collection | DOAJ |
| description | Laser peening without coating (LPwC) is a well-known technique to improve high-cycle fatigue properties by introducing compressive residual stress (RS) near the surface of metal components. In this study, X-ray diffraction (XRD) and flexural fatigue tests were applied to pre-cracked 12 mm thick SM490A welding structural steel specimens that were subjected to LPwC nearly 20 years ago with a pulse energy of 200 mJ, a spot diameter of 0.8 mm and a pulse density of 36 pulse/mm2. XRD revealed that the compressive RS has remained stable to date, with approximately 400–500 MPa remaining at the surface and a compressive depth of approximately 0.9 mm from the surface, which is comparable to the data measured by XRD immediately after LPwC. In the flexural fatigue tests with a stress ratio of 0.1 and stress rages of 100, 150 and 200 MPa, LPwC extended the fatigue life by more than 1.6 times, depending on the stress range and individual specimens. Crack restarting cycles were significantly increased by a factor of at least 1.8, and the crack growth rate was suppressed by a factor of about 0.7 or less. |
| first_indexed | 2024-03-08T23:10:14Z |
| format | Article |
| id | doaj.art-381050e2dbd04468b67180adfd52b392 |
| institution | Directory Open Access Journal |
| issn | 2666-3597 |
| language | English |
| last_indexed | 2024-03-08T23:10:14Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Forces in Mechanics |
| spelling | doaj.art-381050e2dbd04468b67180adfd52b3922023-12-15T07:26:05ZengElsevierForces in Mechanics2666-35972023-12-0113100234Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 platesTomoharu Kato0Yoshihiro Sakino1Yuji Sano2Graduate School of Systems Engineering, Kindai University, Higashihiroshima 739-2116, Japan; Research Fellow of Japan Society for the Promotion of Science, Tokyo 102-0083, Japan; Corresponding author.Faculty of Engineering, Kindai University, Higashihiroshima, 739-2116, JapanInstitute for Molecular Science, National Institutes of Natural Sciences, Okazaki 444-8585, Japan; SANKEN, Osaka University, Ibaraki 567-0047, Japan; LAcubed Co., Ltd., Yokohama 220-0012, JapanLaser peening without coating (LPwC) is a well-known technique to improve high-cycle fatigue properties by introducing compressive residual stress (RS) near the surface of metal components. In this study, X-ray diffraction (XRD) and flexural fatigue tests were applied to pre-cracked 12 mm thick SM490A welding structural steel specimens that were subjected to LPwC nearly 20 years ago with a pulse energy of 200 mJ, a spot diameter of 0.8 mm and a pulse density of 36 pulse/mm2. XRD revealed that the compressive RS has remained stable to date, with approximately 400–500 MPa remaining at the surface and a compressive depth of approximately 0.9 mm from the surface, which is comparable to the data measured by XRD immediately after LPwC. In the flexural fatigue tests with a stress ratio of 0.1 and stress rages of 100, 150 and 200 MPa, LPwC extended the fatigue life by more than 1.6 times, depending on the stress range and individual specimens. Crack restarting cycles were significantly increased by a factor of at least 1.8, and the crack growth rate was suppressed by a factor of about 0.7 or less.http://www.sciencedirect.com/science/article/pii/S2666359723000690Laser peening without coatingPre-crackSM490Residual stress, Fatigue strength |
| spellingShingle | Tomoharu Kato Yoshihiro Sakino Yuji Sano Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates Forces in Mechanics Laser peening without coating Pre-crack SM490 Residual stress, Fatigue strength |
| title | Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates |
| title_full | Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates |
| title_fullStr | Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates |
| title_full_unstemmed | Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates |
| title_short | Effect of laser peening without coating (LPwC) on retardation of fatigue crack growth in SM490 plates |
| title_sort | effect of laser peening without coating lpwc on retardation of fatigue crack growth in sm490 plates |
| topic | Laser peening without coating Pre-crack SM490 Residual stress, Fatigue strength |
| url | http://www.sciencedirect.com/science/article/pii/S2666359723000690 |
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