CYLINDRICAL STRUCTURE UNDER SHOCK LOADING
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Authors
Macapagal, Vernajo P.
Subjects
composite cylinder structure
fluid-structure interaction
shock loading
dynamic loading
underwater shock loading
polylactic acid filament
PLA
carbon fiber composite
CFC
fluid-structure interaction
shock loading
dynamic loading
underwater shock loading
polylactic acid filament
PLA
carbon fiber composite
CFC
Advisors
Kwon, Young W.
Didoszak, Jarema M.
Date of Issue
2023-03
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
Underwater pressure vessels experience a multitude of dynamic and pressure loading when in a submerged environment. Internally, those forces are negligible because of the sound structural integrity the vessel is providing. However, if an underwater explosion should occur—the chances are slim but never zero—the outer shell of that pressure vessel would be affected depending on what is on the other side. This research investigates composite cylinders' response to underwater shock loading through directed pressure loading by compressed air shock pipe underwater release. Two cases are considered, single-wall and double-wall cylindrical structures, to determine the material response and possible failure. Both cases are tested at various stand-off distances, with 0%, 50%, or 100% water levels internally or within the annulus. Fluid-structure interaction effect was discussed for each case. Strain gauges are attached at specific points on the cylindrical structure, and underwater blast sensors are used to record pressures from the directed shock loading. Experimental data is collected and stored using a National Instruments PXIe-1071 processor. By presenting the behavior of composite structures in response to dynamic loading, we provide data for future and present composite vessel design as well as validate current research work.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
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NPS Report Number
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Distribution Statement
Approved for public release. Distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.