Experimental and numerical study on microcrack detection using contact nonlinear acoustics

Xiaojia CHEN; Yuanlin WANG

doi:10.1007/s11709-009-0028-z

Front. Struct. Civ. Eng. ›› 2009, Vol. 3 ›› Issue (2) : 137 -141. DOI: 10.1007/s11709-009-0028-z

RESEARCH ARTICLE

Experimental and numerical study on microcrack detection using contact nonlinear acoustics

Xiaojia CHEN ^*
, Yuanlin WANG

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Abstract

This paper introduces a non-classical nonlinear acoustic theory for microcrack detection in materials, comparing contact nonlinearity with material nonlinearity. The paper’s main work concentrates on the experimental and numerical verification of the effectivity of contact nonlinear acoustic detection by using the contact nonlinear parameter $β ′$ , which can be represented by the ratio of the second-harmonic amplitude to the square of the first-harmonic amplitude. Both experiments and numerical tests are performed. The results show that $β ′$ is sensitive to the initiation of microcracks and varies with the development of the microcracks. The numerical test illustrates the decline of $β ′$ when microcracks penetrate each other.

Keywords

microcrack detection / contact nonlinearity / numerical analysis

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Xiaojia CHEN, Yuanlin WANG. Experimental and numerical study on microcrack detection using contact nonlinear acoustics. Front. Struct. Civ. Eng., 2009, 3(2): 137-141 DOI:10.1007/s11709-009-0028-z

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