Alumina ceramic is being used extensively for external pressure vessels in naval applications. The material is also used in valves and other components, where reliability, immunity from corrosion, and high temperatures are required. This report presents a technique for the nondestructive evaluation of alumina ceramic components. The cracks were produced by laser radiation. Since there is a need for the detection of very fine cracks, scanning acoustic microscopy was found to be superior to optical methods for imaging surface and subsurface cracks. We address the issue of crack initiation with the use of postirradiation analysis. This article reports our results on the evaluation of the surface and interior cracks with optical, scanning laser, scanning electron, and scanning acoustic microscopy. We present images of surface and subsurface microcracks generated at different power levels of a high power laser system. The spatial variation of the Rayleigh wave velocity is measured by the curve technique. These preliminary data suggest that, with some improvement, the technique may detect residual stress with high spatial resolution.
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August 2005
Research Papers
Acoustic Microscopy Applied to Ceramic Pressure Vessels and Associated Components
Chiaki Miyasaka,
Chiaki Miyasaka
The Pennsylvania State University at University Park
, 212 Earth and Engineering Science Building, University Park, PA 16801
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Bernhard R. Tittmann
Bernhard R. Tittmann
The Pennsylvania State University at University Park
, 212 Earth and Engineering Science Building, University Park, PA 16801
Search for other works by this author on:
Chiaki Miyasaka
The Pennsylvania State University at University Park
, 212 Earth and Engineering Science Building, University Park, PA 16801
Bernhard R. Tittmann
The Pennsylvania State University at University Park
, 212 Earth and Engineering Science Building, University Park, PA 16801J. Pressure Vessel Technol. Aug 2005, 127(3): 214-219 (6 pages)
Published Online: January 31, 2005
Article history
Received:
January 25, 2005
Revised:
January 31, 2005
Citation
Miyasaka, C., and Tittmann, B. R. (January 31, 2005). "Acoustic Microscopy Applied to Ceramic Pressure Vessels and Associated Components." ASME. J. Pressure Vessel Technol. August 2005; 127(3): 214–219. https://doi.org/10.1115/1.1990212
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