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Open AccessArticle

Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners

1
Department of Mechatronic and Mechanical Systems, Universidade de São Paulo, Avenida Professor Mello Moraes, 2231, São Paulo, SP CEP 05508-030, Brazil
2
Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de La Serena, Av. Benavente, 980, La Serena, PO 1720170, Chile
3
Department of Mechanical Engineering, Universidade de São Paulo, Avenida Professor Mello Moraes, 2231, São Paulo, SP CEP 05508-030, Brazil
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(7), 515; https://doi.org/10.3390/jmse8070515
Received: 31 May 2020 / Revised: 7 July 2020 / Accepted: 12 July 2020 / Published: 14 July 2020
(This article belongs to the Section Ocean Engineering)
The structure of an autonomous underwater vehicle (AUV), usually composed of a cylindrical shell, may be exposed to high hydrostatic pressures where buckling collapse occurs before yield stress failure. In conventional submarines, welded stiffeners increase the buckling resistance, however, in small AUVs, they reduce the inner space and cause residual stresses. This work presents an innovative concept for the structural design of an AUV, proposing the use of sliding stiffeners that are part of the structure used to accommodate the electronics inside it. Since the sliding stiffeners are not welded to the shell, there are no residual stresses due to welding, the AUV fabrication process is simplified, enabling a reduction of the manufacturing cost, and the inner space is available to accommodate the equipment needed for the AUV mission. Moreover, they provide a higher buckling resistance when compared to that of an unstiffened cylindrical shell. A comparative analysis of the critical buckling loads for different shell designs was carried out considering the following: (i) the unstiffened shell, (ii) the shell with ring stiffeners, and (iii) the shell with sliding stiffeners. Results evidenced that major advantages were obtained by using the latter alternative against buckling. View Full-Text
Keywords: autonomous underwater vehicles; sliding stiffeners; cylindrical shell; buckling; finite element method autonomous underwater vehicles; sliding stiffeners; cylindrical shell; buckling; finite element method
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MDPI and ACS Style

Siqueira Nóbrega de Freitas, A.; Alfonso Alvarez, A.; Ramos, R., Jr.; de Barros, E.A. Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners. J. Mar. Sci. Eng. 2020, 8, 515. https://doi.org/10.3390/jmse8070515

AMA Style

Siqueira Nóbrega de Freitas A, Alfonso Alvarez A, Ramos R Jr., de Barros EA. Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners. Journal of Marine Science and Engineering. 2020; 8(7):515. https://doi.org/10.3390/jmse8070515

Chicago/Turabian Style

Siqueira Nóbrega de Freitas, Artur; Alfonso Alvarez, Alexander; Ramos, Roberto, Jr.; de Barros, Ettore A. 2020. "Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners" J. Mar. Sci. Eng. 8, no. 7: 515. https://doi.org/10.3390/jmse8070515

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