This paper details a numerical study of the dynamic stability of a cylindrical shell structure under combined hydrostatic and dynamic pressure loading within a tubular environment as compared to the traditional loading of hydrostatic pressure alone. Simulations are executed using a coupled Eulerian–Lagrangian scheme, within the dynamic system mechanics advanced simulation (DYSMAS) code, to explicitly model the (1) structural response of a single unstiffened cylindrical shell to dynamic pressure loading and (2) the fluid flow field within the surrounding environment due to the shock and the shell structural response. Simulations involve a non-pressure-compensated aluminum 6061-T6 cylindrical structure with a length-to-diameter ratio, L/D, equal to 9.6. This structure is 31.8 mm (1.25-in) in outer diameter and is concentrically and longitudinally centered within the outer tube, which has an inner diameter of 177.8 mm (7.00-in) and total internal length of 2.13 m (84-in). Simulations are run at four hydrostatic tank pressures, which are categorized by percentage of measured critical collapse pressure, Pc, of the shell structure: 66% Pc, 80% Pc, 85% Pc, and 90%Pc. For each case, the shell structure is subjected to shock loading created by the detonation of a commercial blasting cap at a given standoff to the structure within the confining tube. Simulated pressure histories are compared to experimental pressure data at gage locations. The simulations and corresponding experiments produce the same overall result for three of four cases (i.e., survive: 66%Pc or implode: 85%Pc and 90%Pc). For the 80%Pc case, the overall result differs between simulation and experiment in that the specimen in the experiment survives but the simulated cylinder implodes. However, the discrepancy between the overall experimental result and corresponding simulation is not deemed a failure for the 80%Pc case; instead, this signifies a transitional case for the dynamic stability of the shell structure (i.e., collapse is sensitive to small deviations from assumed conditions in this regime).
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February 2019
Research-Article
Computational Modeling of Dynamically Initiated Instabilities and Implosion of Underwater Cylindrical Structures in a Confined Environment
Emily L. Guzas,
Emily L. Guzas
Naval Undersea Warfare
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
e-mail: emily.guzas@navy.mil
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
e-mail: emily.guzas@navy.mil
Search for other works by this author on:
Sachin Gupta,
Sachin Gupta
Dynamic Photo Mechanics Laboratory,
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Search for other works by this author on:
Joseph M. Ambrico,
Joseph M. Ambrico
Naval Undersea Warfare
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Search for other works by this author on:
James M. LeBlanc,
James M. LeBlanc
Naval Undersea Warfare
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Search for other works by this author on:
Arun Shukla
Arun Shukla
Dynamic Photo Mechanics Laboratory,
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Search for other works by this author on:
Emily L. Guzas
Naval Undersea Warfare
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
e-mail: emily.guzas@navy.mil
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
e-mail: emily.guzas@navy.mil
Sachin Gupta
Dynamic Photo Mechanics Laboratory,
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Joseph M. Ambrico
Naval Undersea Warfare
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
James M. LeBlanc
Naval Undersea Warfare
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Center (Division Newport),
Platform and Payload Integration Department,
Analysis and Technology Branch,
1176 Howell Street,
Newport, RI 02841
Arun Shukla
Dynamic Photo Mechanics Laboratory,
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
Department of Mechanical,
Industrial and Systems Engineering,
University of Rhode Island,
Kingston, RI 02881
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received September 26, 2018; final manuscript received November 19, 2018; published online December 12, 2018. Assoc. Editor: Yong Zhu.This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.
J. Appl. Mech. Feb 2019, 86(2): 021008 (13 pages)
Published Online: December 12, 2018
Article history
Received:
September 26, 2018
Revised:
November 19, 2018
Citation
Guzas, E. L., Gupta, S., Ambrico, J. M., LeBlanc, J. M., and Shukla, A. (December 12, 2018). "Computational Modeling of Dynamically Initiated Instabilities and Implosion of Underwater Cylindrical Structures in a Confined Environment." ASME. J. Appl. Mech. February 2019; 86(2): 021008. https://doi.org/10.1115/1.4042046
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