Digitale Medien
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
60 (1992), S. 1815-1817
ISSN:
1077-3118
Quelle:
AIP Digital Archive
Thema:
Physik
Notizen:
Ceramic materials, such as silicon nitride and silicon carbide, are important because of their high mechanical strength at high temperature and in nonlubricative environments. The weakness of these materials lies in their brittleness. Stress concentration caused by the existence of surface or subsurface cracks can lead to the total mechanical failure of parts. In this letter, we describe the application of the resonant-sphere technique to perform nondestructive evaluation of ceramic bearing balls. The technique had been shown to be capable of measuring various material properties, such as Vs (shear wave velocity) and ν (Poisson's ratio). We use phase and amplitude measurements to simplify the evaluation of various resonance quality factors (Q), and we present, for the first time, the use of a resonance technique to propagate and detect surface waves on a sphere. We also show a decrease in Q for surface-wave modes due to the existence of surface cracks.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.107173
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