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Small–Scale Experimental Investigation of Fatigue Performance Improvement of Ship Hatch Corner with Shot Peening Treatments by Considering Residual Stress Relaxation
| Content Provider | MDPI |
|---|---|
| Author | Gan, Jin Gao, Zi’Ang Wang, Yiwen Wang, Zhou Wu, Weiguo |
| Copyright Year | 2021 |
| Description | Ship hatch corner is a common structure in a ship and its fatigue problem has always been one of the focuses in ship engineering due to the long–term high–stress concentration state during the ship’s life. For investigating the fatigue life improvement of the ship hatch corner under different shot peening (SP) treatments, a series of fatigue tests, residual stress and surface topography measurements were conducted for SP specimens. Furthermore, the distributions of the surface residual stress are measured with varying numbers of cyclic loads, investigating the residual stress relaxation during cyclic loading. The results show that no matter which SP process parameters are used, the fatigue lives of the shot–peened ship hatch corner specimens are longer than those at unpeened specimens. The relaxation rate of the residual stress mainly depends on the maximum compressive residual stress (σRS max ) and the depth of the maximum compressive residual stress (δmax ). The larger the values of σRS max and δmax , the slower the relaxation rates of the residual stress field. The results imply that the effect of residual stress field and surface roughness should be considered comprehensively to improve the fatigue life of the ship hatch corner with SP treatment. The increase in peening intensity (PI) within a certain range can increase the depth of the compressive residual stress field (CRSF), so the fatigue performance of the ship hatch corner is improved. Once the PI exceeds a certain value, the surface damage caused by the increase in surface roughness will not be offset by the CRSF and the fatigue life cannot be improved optimally. This research provides an approach of fatigue performance enhancement for ship hatch corners in engineering application. |
| Starting Page | 419 |
| e-ISSN | 20771312 |
| DOI | 10.3390/jmse9040419 |
| Journal | Journal of Marine Science and Engineering |
| Issue Number | 4 |
| Volume Number | 9 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-04-13 |
| Access Restriction | Open |
| Subject Keyword | Journal of Marine Science and Engineering Marine Engineering Shot Peening Ship Hatch Corner Fatigue Life Surface Roughness Residual Stress Relaxation |
| Content Type | Text |
| Resource Type | Article |
