Acoustic-Emission Wave Response to a Dislocation Source in Layered Media

Abstract:

This paper presents synthesis of acoustic-emission (AE) wave propagation in multi-layer materials and simulation of AE wave responses at free surface. In particular, the AE source is modelled as an arbitrary-orientation dislocation over an inclined-to-surface fault within one layer or at the layer-to-layer interface, while the materials are assumed as multi-layer media, each of which is homogeneous, isotropic and linearly elastic. With the use of the integral transformation approach, the three-dimensional wave propagation in the materials is solved in transformed or frequency-wavenumber domain. Subsequently, a closed-form solution for wave responses at free surface is found, which can then be converted in time-space domain. Numerical examples are finally provided for illustration.

• Periodical: Applied Mechanics and Materials (Volume 598)
• Pages: 135-140
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.598.135
• Online since: July 2014
• Authors: Rui Chong Zhang*
• Keywords: Acoustic Emission (AE), Dislocation Source, Wave Propagation, Wave Scattering

References

[1] M. A. Hamstad, A Review: Acoustic Emission, a Tool for Composite-Materials Studies. Experimental Mechanics, 26 pp.7-13 (1986).

DOI: 10.1007/bf02319949

[2] W. Yoshinori, I. Ken-Ichi, S. Kazuhiko, F. Yoshiaki, B. Rao, G. Hua and L. Xun, A Modeling Method on Fractal Distribution of Cracks in Rocks Using AE Monitoring. J. Acoustic Emission 23 (2005).

[3] F. F. Barsoum, J. Suleman, A. Korcak and E. V. K. Hill, Acoustic Emission Monitoring and Fatigue Life Prediction in Axially Loaded Notched Steel Specimens. Journal of Acoustic Emission. Vol. 27, 40-63 (2009).

DOI: 10.1061/41171(401)203

[4] M. Kalicka, Acoustic Emission as a Monitoring Method in Prestressed Concrete Bridges Health Condition Evaluation. Journal of Acoustic Emission, 27, 18-26 (2009).

[5] L. M. Spasova, M. I. Ojovan and C. R. Scales, Acoustic emission technique applied for monitoring and inspection of cementitious structures encapsulating aluminium. Acoustic Emission, 25, 51-68 (2007).

[6] L.B. Freund, Dynamic Fracture Mechanics. Cambridge University Press (1998).

[7] C. U. Grosse, and M. Ohtsu, Acoustic Emission Testing - Basics for Research-Applications in Civil Engineering. Springer Verlag, Berlin & Heidelberg, Germany (2008).

[8] R. Burridge and L. Knopoff , Body force equivalents for seismic dislocations. Bull. Seismol. Soc. Am., 54, 1875-1888 (1964).

DOI: 10.1785/bssa05406a1875

[9] G.E. Backus and M. Mulcahy, Moment tensors and other phenomenological descriptions of seismic sources. – I. Continuous displacements, Geophys. J. Roy. Astron., Soc., 46, 341-361 (1976a).

DOI: 10.1111/j.1365-246x.1976.tb04162.x

[10] G.E. Backus and M. Mulcahy, Moment tensors and other phenomenological descriptions of seismic sources – II. Discontinuous displacements, Geophys. J. Roy. Astron., Soc., 47, 301-329 (1976b).

DOI: 10.1111/j.1365-246x.1976.tb01275.x

[11] B. L. N. Kennett, Seismic wave propagation in stratified elastic media. Cambridge University Press (1983).

[12] M.A. Hamstad, A.O. Gallagher and J. Gary, Effects of lateral plate dimensions on acoustic Emission signals from dipole sources. Journal of Acoustic Emission 19, 258–274 (2001).