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Observation of stable crack growth in Al2O3 ceramics using a scanning acoustic microscope

✍ Scribed by A. Quinten; W. Arnold

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
800 KB
Volume
122
Category
Article
ISSN
0921-5093

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✦ Synopsis

We employed ultrasonic techniques in order to gain information on the R-curve behavior of Al_,O~ ceramics. A reduction in the sound velocity has been observed at the crack tip of subcritically grown cracks. The measurements were carried out by time-of-flight measurements, and by evaluating the V(z) curves obtained from a scanning acoustic microscope. Furthermore, we could also observe effects related to the interaction of serrated crack walls by in situ experiments in the scanning acoustic microscope.

*Our samples were manufactured by Feldmtihle AG, Plochingen, F.R.G., (B40) and at the University of Dortmund (Dr. R. Steinbrech, N28). They have been characterized by K. B~ir, G. Kleist and T. Lexen, Kernforschungsanlage Jiilich (unpublished).

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