A Non-Destructive Test Crack Detection Method Using Vibration Acoustic On Aluminium Plate

Nur Ilmi , Mohamad Roslan (2013) A Non-Destructive Test Crack Detection Method Using Vibration Acoustic On Aluminium Plate. Project Report. UTeM, Melaka. (Submitted)

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Abstract

This study is carried out to investigate the crack that occurs on the aluminum plate by using non-linear vibro acoustic method. Non-linear Vibro-Acoustic is a method that can be used to detect and analyze any defect, even very small cracks. This method is very fast and sensitive to detect cracks. The main objectives are to perform nonlinear vibro-acoustic test for detecting fatigue crack in aluminum plate. Beside, to determine the relation between fatigue crack sizes with nonlinear wave modulation effect, (R-value) .Two test will be carried out that is modal test and vibro-acoustic test. Modal test is performed to select the low frequency values to excite the plate. While, Vibro-acoustic test is performed to investigate the present of crack on the plate. The cracked identification is measured by using the intensity of wave modulation called as R-value index. The result shows that, the intensity of vibro-acoustic modulation depends on crack length; larger cracks produce more modulation sidebands with larger amplitudes. The finding shows that for certain mode when crack length increase, R-Value also increases. However, not all frequency is suitable to be used to determine the relationship of R-value and crack length.

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