Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion
To investigate the overall damage characteristics and failure modes of a warship subjected to an underwater non-contact near-field explosion, a hull girder with a trapezoidal cross-section was designed, manufactured, and tested. The design criteria and parameters were determined according to the sim...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-03-01
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| Series: | Defence Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214914721001884 |
| _version_ | 1797861151107710976 |
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| author | Hai-tao Li Xin-ying Zheng Chi Zhang Zhi-yuan Mei Xue-fei Bai Kai Liu |
| author_facet | Hai-tao Li Xin-ying Zheng Chi Zhang Zhi-yuan Mei Xue-fei Bai Kai Liu |
| author_sort | Hai-tao Li |
| collection | DOAJ |
| description | To investigate the overall damage characteristics and failure modes of a warship subjected to an underwater non-contact near-field explosion, a hull girder with a trapezoidal cross-section was designed, manufactured, and tested. The design criteria and parameters were determined according to the similarity criterion. Dynamic responses of the girder freely floating on water were obtained under varying conditions, including stand-off distance, charge mass, and position of attack. Damage morphologies of the girder model were obtained. Based on our analysis, basic conditions for sagging damage of the hull girder are proposed. The aim of this study was to determine an efficient method of attack resulting in the most severe damage to the ship hull. The experimental results show that the girder mainly exhibits a first-order response when the first wet frequency of the girder is close to the frequency of the explosion bubble pulsation. The largest deformation was observed when the underwater explosion occurred directly below the midspan of the girder compared to other explosions of the same intensity at different attack positions. When the ratio of stand-off to maximum bubble radius (λ) satisfies 0.7 ≤ λ＜2, the bubble mainly causes sagging damage instead of hogging. As λ decreases (1≤ λ＜2), the sagging damage increases under the same charge mass. However, as λ decreases further (0.7≤ λ＜1), the sagging deformation decreases. This is likely due to the impact of the liquid jet formed by the collapsing bubble, which causes the girder deformation to shift from sagging back to hogging deformation. The initial shock wave excites the high-frequency response of the girder structure but contributes very little to the overall velocity and displacement. However, bubble pulsation typically causes a low-frequency response, which will affect the velocity and displacement of the girder. The low-pressure region of the flow field formed by bubble pulsation and resonant coupling between the girder and the bubble are the predominant causes of damage to the overall girder structure. |
| first_indexed | 2024-04-09T21:57:28Z |
| format | Article |
| id | doaj.art-7c94f13334934d9a8b56b4da152b6d14 |
| institution | Directory Open Access Journal |
| issn | 2214-9147 |
| language | English |
| last_indexed | 2024-04-09T21:57:28Z |
| publishDate | 2023-03-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Defence Technology |
| spelling | doaj.art-7c94f13334934d9a8b56b4da152b6d142023-03-24T04:22:13ZengKeAi Communications Co., Ltd.Defence Technology2214-91472023-03-0121113Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosionHai-tao Li0Xin-ying Zheng1Chi Zhang2Zhi-yuan Mei3Xue-fei Bai4Kai Liu5Corresponding author.; College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan, 430033, PR ChinaCollege of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan, 430033, PR ChinaCollege of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan, 430033, PR ChinaCollege of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan, 430033, PR ChinaCollege of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan, 430033, PR ChinaCorresponding author.; College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan, 430033, PR ChinaTo investigate the overall damage characteristics and failure modes of a warship subjected to an underwater non-contact near-field explosion, a hull girder with a trapezoidal cross-section was designed, manufactured, and tested. The design criteria and parameters were determined according to the similarity criterion. Dynamic responses of the girder freely floating on water were obtained under varying conditions, including stand-off distance, charge mass, and position of attack. Damage morphologies of the girder model were obtained. Based on our analysis, basic conditions for sagging damage of the hull girder are proposed. The aim of this study was to determine an efficient method of attack resulting in the most severe damage to the ship hull. The experimental results show that the girder mainly exhibits a first-order response when the first wet frequency of the girder is close to the frequency of the explosion bubble pulsation. The largest deformation was observed when the underwater explosion occurred directly below the midspan of the girder compared to other explosions of the same intensity at different attack positions. When the ratio of stand-off to maximum bubble radius (λ) satisfies 0.7 ≤ λ＜2, the bubble mainly causes sagging damage instead of hogging. As λ decreases (1≤ λ＜2), the sagging damage increases under the same charge mass. However, as λ decreases further (0.7≤ λ＜1), the sagging deformation decreases. This is likely due to the impact of the liquid jet formed by the collapsing bubble, which causes the girder deformation to shift from sagging back to hogging deformation. The initial shock wave excites the high-frequency response of the girder structure but contributes very little to the overall velocity and displacement. However, bubble pulsation typically causes a low-frequency response, which will affect the velocity and displacement of the girder. The low-pressure region of the flow field formed by bubble pulsation and resonant coupling between the girder and the bubble are the predominant causes of damage to the overall girder structure.http://www.sciencedirect.com/science/article/pii/S2214914721001884Underwater explosionBubble pulsationSagging damageDynamic response |
| spellingShingle | Hai-tao Li Xin-ying Zheng Chi Zhang Zhi-yuan Mei Xue-fei Bai Kai Liu Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion Defence Technology Underwater explosion Bubble pulsation Sagging damage Dynamic response |
| title | Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion |
| title_full | Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion |
| title_fullStr | Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion |
| title_full_unstemmed | Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion |
| title_short | Sagging damage characteristics of hull girder with trapezoidal cross-section subjected to near-field underwater explosion |
| title_sort | sagging damage characteristics of hull girder with trapezoidal cross section subjected to near field underwater explosion |
| topic | Underwater explosion Bubble pulsation Sagging damage Dynamic response |
| url | http://www.sciencedirect.com/science/article/pii/S2214914721001884 |
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