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Title: Experimental study on fatigue crack identification of 7075 aluminium alloy plate using combination NEWMS and TRA
Authors: Gao, G L
Shi, D Q
Li, D Y
Dong, J W
Shi, X D
Keywords: Fatigue crack
Nonlinear elastic wave modulation spectroscopy
Time reversal acoustic
7075 Alumnium alloy plate
Issue Date: Oct-2011
Publisher: NISCAIR-CSIR, India
Abstract: According to nonlinear elastic wave modulation spectroscopy (NEWMS) and time reversal acoustic (TRA), a system is constructed to study the fatigue crack in 7075 aluminium alloy plate. Using different frequency excitation source (<i style="mso-bidi-font-style:normal">f</i><sub>1</sub>=270 kHz and <i style="mso-bidi-font-style:normal">f</i><sub>2</sub>=70 kHz), two types of samples, one is with the crack and the other is without the crack, are comparatively experimented. Intermodulation components (<i style="mso-bidi-font-style: normal">f<sub>+</sub></i>=<i style="mso-bidi-font-style:normal">f</i><sub>1</sub><i style="mso-bidi-font-style:normal">+f</i><sub>2</sub>, <i style="mso-bidi-font-style: normal">f<sub>-</sub></i>= <i style="mso-bidi-font-style:normal">f</i><sub>1</sub><i style="mso-bidi-font-style:normal">-f</i><sub>2<i style="mso-bidi-font-style: normal"> </i></sub>) around the fatigue crack are analyzed. The experimental results show <i style="mso-bidi-font-style:normal">f<sub>±</sub></i> can be used to indicate the presence of the crack. The two-dimensional contour plot of the energy from the sample surface amplitude can be used to locate the crack position.
Description: 377-380
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.18(5) [October 2011]

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