Degree Type

Thesis

Date of Award

2011

Degree Name

Master of Science

Department

Aerospace Engineering

First Advisor

Vinay Dayal

Abstract

Ceramic tiles are the main ingredient of a multi–material, multi–layered composite being considered for the modernization of tank armors. The high stiffness, low attenuation, and precise dimensions of these uniform tiles make them remarkable resonators when driven to vibrate. Defects in the tile, during manufacture or after usage, are expected to change the resonance frequencies and resonance images of the tile. The comparison of the resonance frequencies and resonance images of a pristine tile/lay–up to a defective tile/lay–up will thus be a quantitative damage metric. By examining the vibrational behavior of these tiles and the composite lay–up with Finite Element Modeling and analytical plate vibration equations, the development of a new Nondestructive Evaluation technique is possible. This study examines the development of the Air–Coupled Ultrasonic Resonance Imaging technique as applied to a hexagonal ceramic tile and a multi–material, multi–layered composite.

Copyright Owner

Richard Livings

Language

en

Date Available

2012-04-06

File Format

application/pdf

File Size

118 pages

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