Ultrasonic Characterization of Surface and Sub-Surface Defects in Ceramic Materials

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1990
Authors
Stockman, A.
Lam, M.
Nicholson, P.
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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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Abstract

The ultrasonic testing of ceramic materials is a two headed problem. First, the defect must be detected and second it must be characterized. Interior defects as small as 5 pm can be catastrophic as can surface cracks of less than a micrometer opening. There are a number of problems to be overcome in the detection of defects ultrasonically such as the amplitude of the ultrasonic signals and the maximum useful frequency of the ultrasound. These problems are being addressed by the development of high power, 100 to 200 MHz transducers and the improvement of electronics technology. This paper is concerned with the second problem, ie the characterization of defects and is divided into two parts, one concerned with interior defects and the second with surface defects. The common thread is the spectral analysis of the signals received from the defects.

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Mon Jan 01 00:00:00 UTC 1990