Analysis Of Wave Amplitude Modulation Effect For Variable Crack Orientations In Vibro Acoustic Inspection Method : Simulation Approach

Nursakinah , Mahmud (2013) Analysis Of Wave Amplitude Modulation Effect For Variable Crack Orientations In Vibro Acoustic Inspection Method : Simulation Approach. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Nonlinear vibro-acoustic is a highly reliable and sensitive method for damage detection. It is a method based on propagation of high frequency acoustic waves in solid structures with low-frequency excitation. The interaction between acoustic waves with material changes will cause wave distortion effects. Nonlinear acoustic modulations are investigated for fatigue crack detection. The focus in this project is used for crack detection in aluminium plate. Finite Element (FE) modelling is used to establish frequencies of modal and ultrasonic excitation. The plate is divided into two types which is uncracked plate and cracked plate. The crack plate will be design at difference orientation between them. The models of plat will be simulating by using Abaqus software to get the natural frequency and mode shape. The node displacement point also will be creating at below and above cracked line. The average of R-value for crack orientations will be shown after running a transfer function by using Matlab software. The relationship between average of R-value and crack orientations will be plotted.

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