Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure
Spherical shell structures are the most suitable shape for deep-sea pressure hulls because they have ideal mechanical properties for handling symmetrical pressure. However, the shape accuracy requirement for a hull in a spherical shell structure subjected to deep-sea pressure is extremely high. Even...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Series: | Designs |
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| Online Access: | https://www.mdpi.com/2411-9660/7/1/12 |
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| author | Yang Jing Chenghai Kong Jingchao Guan Wei Zhao Apollo B. Fukuchi Xilu Zhao |
| author_facet | Yang Jing Chenghai Kong Jingchao Guan Wei Zhao Apollo B. Fukuchi Xilu Zhao |
| author_sort | Yang Jing |
| collection | DOAJ |
| description | Spherical shell structures are the most suitable shape for deep-sea pressure hulls because they have ideal mechanical properties for handling symmetrical pressure. However, the shape accuracy requirement for a hull in a spherical shell structure subjected to deep-sea pressure is extremely high. Even minor asymmetry can significantly degrade its mechanical properties. In this study, a new type of spherical deep-sea pressure hull structure and its integral hydro-bulge-forming (IHBF) method are proposed. First, 32 flat metal plate parts are prepared and welded along their straight sides to form a regular polygonally shaped box. Next, water pressure is applied inside the preformed box to create a spherical pressure vessel. We performed a forming experiment using a spherical pressure vessel with a design radius of 250 mm as a verification research object. The radius of the spherical pressure vessel obtained from the forming experiment is 249.32 mm, the error from the design radius is 0.27%, and the roundness of the spherical surface is 2.36 mm. We performed a crushing analysis using uniform external pressure to confirm the crushing and buckling characteristics of the formed spherical pressure vessel. The results show that the work-hardening increased the crushing and buckling load of the spherical pressure vessel, above that of the conventional spherical shell structure. Additionally, it is established that local defects and the size of the weld line significantly and slightly affected the crushing and buckling load of the spherical pressure hull, respectively. |
| first_indexed | 2024-03-11T08:57:43Z |
| format | Article |
| id | doaj.art-31fbc1e83b18492e9d3bc7eaa1991fc7 |
| institution | Directory Open Access Journal |
| issn | 2411-9660 |
| language | English |
| last_indexed | 2024-03-11T08:57:43Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
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| series | Designs |
| spelling | doaj.art-31fbc1e83b18492e9d3bc7eaa1991fc72023-11-16T19:59:35ZengMDPI AGDesigns2411-96602023-01-01711210.3390/designs7010012Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull StructureYang Jing0Chenghai Kong1Jingchao Guan2Wei Zhao3Apollo B. Fukuchi4Xilu Zhao5College of Mechanical Engineering, Saitama Institute of Technology, Saitama 369-0293, JapanTopy Industries Co., Ltd., Aichi 441-8510, JapanCollege of Mechanical Engineering, Saitama Institute of Technology, Saitama 369-0293, JapanWeichai Global Axis Technology Co., Ltd., Tokyo 107-0062, JapanCollege of Mechanical Engineering, Saitama Institute of Technology, Saitama 369-0293, JapanCollege of Mechanical Engineering, Saitama Institute of Technology, Saitama 369-0293, JapanSpherical shell structures are the most suitable shape for deep-sea pressure hulls because they have ideal mechanical properties for handling symmetrical pressure. However, the shape accuracy requirement for a hull in a spherical shell structure subjected to deep-sea pressure is extremely high. Even minor asymmetry can significantly degrade its mechanical properties. In this study, a new type of spherical deep-sea pressure hull structure and its integral hydro-bulge-forming (IHBF) method are proposed. First, 32 flat metal plate parts are prepared and welded along their straight sides to form a regular polygonally shaped box. Next, water pressure is applied inside the preformed box to create a spherical pressure vessel. We performed a forming experiment using a spherical pressure vessel with a design radius of 250 mm as a verification research object. The radius of the spherical pressure vessel obtained from the forming experiment is 249.32 mm, the error from the design radius is 0.27%, and the roundness of the spherical surface is 2.36 mm. We performed a crushing analysis using uniform external pressure to confirm the crushing and buckling characteristics of the formed spherical pressure vessel. The results show that the work-hardening increased the crushing and buckling load of the spherical pressure vessel, above that of the conventional spherical shell structure. Additionally, it is established that local defects and the size of the weld line significantly and slightly affected the crushing and buckling load of the spherical pressure hull, respectively.https://www.mdpi.com/2411-9660/7/1/12spherical pressure hullmechanical properties of spherical pressure structureintegral hydro bulge-formingcrushing and buckling performancebulging and forming method |
| spellingShingle | Yang Jing Chenghai Kong Jingchao Guan Wei Zhao Apollo B. Fukuchi Xilu Zhao Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure Designs spherical pressure hull mechanical properties of spherical pressure structure integral hydro bulge-forming crushing and buckling performance bulging and forming method |
| title | Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure |
| title_full | Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure |
| title_fullStr | Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure |
| title_full_unstemmed | Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure |
| title_short | Design and Manufacturing Process of a New Type of Deep-Sea Spherical Pressure Hull Structure |
| title_sort | design and manufacturing process of a new type of deep sea spherical pressure hull structure |
| topic | spherical pressure hull mechanical properties of spherical pressure structure integral hydro bulge-forming crushing and buckling performance bulging and forming method |
| url | https://www.mdpi.com/2411-9660/7/1/12 |
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