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Frontiers of Structural and Civil Engineering

Front Arch Civil Eng Chin    2009, Vol. 3 Issue (2) : 137-141
Experimental and numerical study on microcrack detection using contact nonlinear acoustics
Xiaojia CHEN(), Yuanlin WANG
School of Transportation, Wuhan University of Technology, Wuhan 430063, China
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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     
Corresponding Authors: CHEN Xiaojia,   
Issue Date: 05 June 2009
 Cite this article:   
Xiaojia CHEN,Yuanlin WANG. Experimental and numerical study on microcrack detection using contact nonlinear acoustics[J]. Front Arch Civil Eng Chin, 2009, 3(2): 137-141.
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Xiaojia CHEN
Yuanlin WANG
Fig.1  Nonlinear ultrasonic testing system configuration
samples with damagesamples without damage
extension /%0.1010.2010.3200.0040.0050.005
Tab.1  Extension of testing samples caused by alkali-silica reaction
Fig.2  Ratio of the second harmonic amplitude to square amplitude of the first harmonic
Fig.3  Relationship between line slope and extension caused by ASR
Fig.4  Numerical model for nonlinear acoustic detection of crack
modelcrack length/mmcenter crack width/mmcrack number
Tab.2  Models for numerical analysis
Fig.5  Frequency-domain signal of restraint counterforce for model DL80mmNP
Fig.6  Relationship between ratio and total crack length
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