SEDL / STP / STP1045-EB / STP24613S

Measurement of the Modulus of Dynamic Elasticity of Extremely Thin (Sub-Wavelength) Specimens

Kinra, VK
Associate Professor, Texas A&M University, College Station, Texas

Dayal, V
Associate Professor, Texas A&M University, College Station, Texas

Pages: 29    Published: Jan 1990

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Abstract

The current methods of ultrasonic modulus measurement make, implicitly or explicitly, the following key assumption: The front-surface and the back-surface reflections of an incident pulse are separable in the time-domain, i.e., the plate is several wavelengths thick. By combining standard ultrasonic methods with the theory of Fourier Transforms, a new technique has been developed which removes the preceding restriction. The theoretical and the experimental procedures are described in detail. The efficacy of the method is demonstrated for three disparate materials: (1) non-attenuative, non-dispersive; (2) weakly attenuative, non-dispersive; and (3) highly attenuative, highly dispersive.