Ultrasonic Determination of Elastic Constants from Oblique Angles of Incidence in Non-Symmetry Planes

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1990
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Mignogna, R.
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.

This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.

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The most common technique to determine the elastic constants of anisotropic materials from ultrasonic wave speed measurements requires that the material be cut into samples such that particular symmetry directions can be accessed for normal incidence wave speed measurements.[1,2] This is a destructive technique and is not feasible for thin or inhomogeneous materials. A truly nondestructive technique is needed. Recent work along these lines has addressed composite materials using ultrasonic immersion techniques.[3–7] However these methods have been limited to measurements in symmetry planes. Due to this limitation, all of the elastic constants can not be obtained by this technique alone. Two of the limiting factors are: the lack of a general analytic closed form solution for elastic wave propagation in anisotropic materials and that the energy vector does not, in general, lie in the plane formed by the incident wave and the refracted phase velocity. However, general analytic closed form solutions have been recently reported, removing the first of the limitations.[8,9] The second limitation greatly complicates the analysis of the problem.

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Mon Jan 01 00:00:00 UTC 1990