Thermal wave imaging of closed cracks in opaque solids
- 1 November 1983
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 54 (11) , 6245-6255
- https://doi.org/10.1063/1.331942
Abstract
Thermal wave scattering from closed, slanted cracks is investigated both theoretically and experimentally. A Born approximation calculation is carried out for the particular case of gas-cell detection for three crack angles. Good agreement is found with experimental images of both the magnitude and phase of the gas-cell signal variation for cracks fabricated in an aluminum alloy at these same angles. Good agreement is also found between theory and experiment for the frequency dependence of the thermal wave scattering from a 45° crack. It is shown theoretically and confirmed experimentally that a strictly vertical, closed crack is not observable by gas-cell detection, but is easily seen by mirage-effect (optical beam probe) detection. The results for model cracks are applied to the case of brittle fractures in solids.This publication has 18 references indexed in Scilit:
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