UNDERWATER SHOCK LOADING OF CONCENTRIC PLA CYLINDERS WITH A FILAMENT ANNULUS
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Authors
Wood, Dylan R.
Subjects
composite materials
shockwave
underwater
structures
loading
strain
shockwave
underwater
structures
loading
strain
Advisors
Kwon, Young W.
Didoszak, Jarema M.
Date of Issue
2024-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This research studied the dynamic loading of 3D-printed concentric PLA cylinders when subjected to an underwater shock event. The open-cell filament annulus was studied with three different patterns: tetrakaidecahedron, cube, and auxetic. The cylinders were sealed by two aluminum end caps and then suspended in the anechoic water tank using ropes. The test samples varied in distance from the rupture disk in 15 cm increments, starting at 75 cm and going to 15 cm. The compressed air broke the rupture disk at 2068.43 kPa (300 psi), to simulate an underwater shock explosion. The effects of outer cylinder strain in response to the shock wave pressure were studied to determine which filament annulus pattern was better at survivability, while maintaining the total mass of the cylinder and cross-section of the shapes constant. The research concluded that all the filament annuli tested were able to survive the 30 cm shock wave without major damage. The cube pattern, however, experienced the least amount of front strain while being the easiest to design and implement into the cylinder, making it the overall best.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
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NPS Report Number
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Citation
Distribution Statement
Distribution Statement A. 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.