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Open AccessArticle

Failure Analysis on a Collapsed Flat Cover of an Adjustable Ballast Tank Used in Deep-Sea Submersibles

1
Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 201306, China
2
Jiangsu Provincial Key Laboratory of Advanced Manufacture and Process for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang 212003, China
3
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
4
School of Engineering, Westlake University, Hangzhou 310024, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(23), 5258; https://doi.org/10.3390/app9235258
Received: 14 October 2019 / Revised: 28 November 2019 / Accepted: 28 November 2019 / Published: 3 December 2019
(This article belongs to the Special Issue Recent Trends in Advanced High-Strength Steels)
A flat cover of an adjustable ballast tank made of high-strength maraging steel used in deep-sea submersibles collapsed during the loading process of external pressure in the high-pressure chamber. The pressure was high, which was the trigger of the collapse, but still considerably below the design limit of the adjustable ballast tank. The failure may have been caused by material properties that may be defective, the possible stress concentration resulting from design/processing, or inappropriate installation method. The present paper focuses on the visual inspections of the material inhomogeneity, ultimate cause of the collapse of the flat cover in pressure testing, and finite element analysis. Special attention is paid to the toughness characteristics of the material. The present study demonstrates the importance of material selection for engineering components based on the comprehensive properties of the materials. View Full-Text
Keywords: flat cover; adjustable ballast tank; fracture; high-strength maraging steel; toughness flat cover; adjustable ballast tank; fracture; high-strength maraging steel; toughness
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MDPI and ACS Style

Wang, F.; Wu, M.; Tian, G.; Jiang, Z.; Zhang, S.; Zhang, J.; Cui, W. Failure Analysis on a Collapsed Flat Cover of an Adjustable Ballast Tank Used in Deep-Sea Submersibles. Appl. Sci. 2019, 9, 5258.

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