Effect of surface coating on one-dimensional system subjected to unit step pressure wave
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Authors
Kwon, Young W.
Shin, Y. S.
Brasek, Thomas Peyton
Subjects
Underwater explosion, surface coating
Advisors
Date of Issue
1994-09
Date
1994-09
Publisher
Monterey, CA; Naval Postgraduate School
Language
en_US
Abstract
The response of a one-dimensional, coated, aluminum structure subjected to a unit step pressure wave is studied. The coating is either an elastic material or a viscoelastic tread stock rubber of variable stiffness; it separates the structure from an air or a water medium. The stress and nodal velocity of the structure coated with different materials is compared to a system without a coating (homogeneous system). Both the stress and nodal velocity of the structure increase with a decreasing coating stiffness regardless of the coating type or bounding medium. This phenomenon indicates that the coating stiffness governs the degree of strain energy release from the structure to the medium. A softer coating appears to trap this excess energy increasing the stress in the structure. In all cases studied, the stiffer coating reduced the dynamic response of the structure when compared to the homogeneous system. A rubber shear modulus of approximately 6000 psi and greater ensured a favorable dynamic response for a coated aluminum structure enacted upon by a step pressure wave travelling in either air or water. The threshold value may vary depending upon the geometry and material properties of both the coating and the structure
Type
Technical Report
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
NPS-ME-94-006
Sponsors
Defense Nuclear Agency
Alexandria, VA
Funding
MIPR NO. 94-573
Format
viii, 41 p. : ill. ; 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.