Effect of surface coating on one-dimensional system subjected to unit step pressure wave
By: by T.P. Brasek, Y.W. Kwon, Y.S. Shin
Contributors: Kwon, Young W.; Shin, Y. S.; Naval Postgraduate School (U.S.). Dept. of Mechanical Engineering
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1994
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 41
Subjects: Viscoelasticity; Stress analysis
Other titles: NPS-ME-94-006.
Description: 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.
Notes: Cover title.

"NPS-ME-94-006."

"October 1, 1993 - September 30, 1994."

AD-A288-237.

Includes bibliographical references (p. 39-40)

aq/  /aq cc:9116 03/27/97.