Structural Monitoring and Maintenance

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Buckling failure of cylindrical ring structures subjected to coupled hydrostatic and hydrodynamic pressures

  • Ping, Liu (Department of Civil Engineering and Architecture, Jiangsu University of Science and Technology) ;
  • Feng, Yang Xin (Department of Civil Engineering and Architecture, Jiangsu University of Science and Technology) ;
  • Ngamkhanong, Chayut (Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University)
  • Received : 2021.04.19
  • Accepted : 2021.10.08
  • Published : 2021.12.25
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Abstract

This paper presents an analytical approach to calculate the buckling load of the cylindrical ring structures subjected to both hydrostatic and hydrodynamic pressures. Based on the conservative law of energy and Timoshenko beam theory, a theoretical formula, which can be used to evaluate the critical pressure of buckling, is first derived for the simplified cylindrical ring structures. It is assumed that the hydrodynamic pressure can be treated as an equivalent hydrostatic pressure as a cosine function along the perimeter while the thickness ratio is limited to 0.2. Note that this paper limits the deformed shape of the cylindrical ring structures to an elliptical shape. The proposed analytical solutions are then compared with the numerical simulations. The critical pressure is evaluated in this study considering two possible failure modes: ultimate failure and buckling failure. The results show that the proposed analytical solutions can correctly predict the critical pressure for both failure modes. However, it is not recommended to be used when the hydrostatic pressure is low or medium (less than 80% of the critical pressure) as the analytical solutions underestimate the critical pressure especially when the ultimate failure mode occurs. This implies that the proposed solutions can still be used properly when the subsea vehicles are located in the deep parts of the ocean where the hydrostatic pressure is high. The finding will further help improve the geometric design of subsea vehicles against both hydrostatic and hydrodynamic pressures to enhance its strength and stability when it moves underwater. It will also help to control the speed of the subsea vehicles especially they move close to the sea bottom to prevent a catastrophic failure.

Keywords

Acknowledgement

The first author is sincerely grateful to Professor Chang-Fu Hu for his guidance. This work is financially supported by the National Natural Science Foundation of China (No. 51508238) which is in charge of the first author.

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