Scattering of ultrasound in damaged concrete

Liyong Yang; Joseph A. Turner

doi:10.1117/12.469881

11 June 2002 Scattering of ultrasound in damaged concrete

Liyong Yang, Joseph A. Turner

Proceedings Volume 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems; (2002) https://doi.org/10.1117/12.469881
Event: NDE For Health Monitoring and Diagnostics, 2002, San Diego, California, United States

Abstract

The scattering of elastic waves in a medium with damage from microcracking is discussed. A generalized tensor-based approach is used such that the results are coordinate free. The influence of damage from penny-shaped microcracks within a homogeneous medium is considered. The microcracks are assumed to be randomly oriented and uniformly distributed. Explicit expressions are derived for the attenuation of longitudinal and shear elastic waves in terms of the statistics damage parameter and the effective elastic moduli of the medium. The derivation is based upon diagrammatic methods. The problem is formulated in terms of the Dyson equation, which is solved for the mean field response within the limits of the first-order smoothing approximation. The attenuations are given here in a direct way. The longitudinal and shear attenuations are discussed in terms of their frequency dependence and damage dependence. In particular, the effective elastic stiffness of statistical distribution of microcracks and the example results are discussed. The attenuations are shown to scale with the square of the damage parameter for low frequency.

Citation Download Citation

Liyong Yang and Joseph A. Turner "Scattering of ultrasound in damaged concrete", Proc. SPIE 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, (11 June 2002); https://doi.org/10.1117/12.469881

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