Summary
An investigation of scattering from surface cracks has been conducted. In particular, the change in the reflection coefficient of a Rayleigh wave, incident on a surface indentation crack, has been measured as the sample is stressed to fracture. The acoustic measurements have been correlated with the stable crack extension that precedes final failure. The crack extension behavior of as-indented specimens was found to differ appreciably from that of annealed specimens. Cracks in the annealed samples exhibited partial crack tip closure, but little stable extension, whereas cracks in the as-indented samples displayed both crack closure and irreversible crack growth. This behavior has been rationalized by invoking concepts based upon the residual stresses created by indentation. Machining damage was also investigated. We observe that long slot-like cracks are generated due to machining damage. These cracks exhibit a behavior similar to isolated cracks in the presence of residual stress. Because machining generates a large number of cracks, and because scattering from slot-like cracks is more complicated than scattering from isolated cracks, statistical modeling has to be used for accurate failure prediction.
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References
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Tien, J. J. W., Khuri-Yakub, B. T., Kino, G. S., Marshall, D. B., and Evans, A. G., “Surface Acoustic Wave Measurements of Surface Cracks in Ceramics,” Accepted for Publication, J. of NDE.
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© 1983 Springer-Verlag Berlin Heidelberg
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Tien, J.J., Liang, K., Khuri-Yakub, B.T., Kino, G.S., Marshall, D.B., Evans, A.G. (1983). Surface Cracks: Size and Failure Prediction Using Long Wavelength Measurements. In: Höller, P. (eds) New Procedures in Nondestructive Testing. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-02363-1_17
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DOI: https://doi.org/10.1007/978-3-662-02363-1_17
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