Theoretical and Numerical Study of Eddy Current Pulsed Thermography to Detect Damage of Deep-Sea Manned Pressure Hull

被引:0
|
作者
Wu, Yu [1 ]
Zhang, Chaohua [1 ]
Wang, Fang [1 ]
Yang, Chao [2 ]
机构
[1] Shanghai Ocean Univ, Coll Engn Sci & Technol, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China
[2] Shanghai Maritime Univ, Merchant Marine Coll, Shanghai 201306, Peoples R China
基金
中国国家自然科学基金;
关键词
deep-sea; manned submersible; micro crack; eddy current; SYSTEM;
D O I
10.3390/jmse11071410
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
At present, research on pressure hull safety is mainly focused on the constitutive model of material properties and the evaluation model of structural parameters aiming at fatigue life prediction. The damage identification and quantitative evaluation methods of pressure hulls have not been studied. In this study, an eddy current thermal imaging method is introduced to detect micro-cracks in a deep-sea spherical pressure hull. In the detection method, temperature is used as a parameter to identify and quantify cracks. The temperature distribution around the cracks is studied using theoretical analysis and finite element simulation. A theoretical model is established using electromagnetic theory and heat transfer theory. Moreover, the temperature difference between the cracked area and the non-cracked area can be obtained by solving the heat conduction equation. A pulsed eddy current thermal imaging testing system is established, and a defective titanium alloy specimen is tested. At the same time, the temperature around the cracks in the specimens is simulated. The specimens have the same material and welding as a deep-sea spherical pressure hull. This paper discusses the possibility of its use in a pressure hull, which will provide a reference for micro-crack damage identification and quantitative evaluation of a deep-sea spherical pressure hull.
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页数:16
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