Application of converted mode for defect defection in plate

Abd Razak, Mohamad Izreen (2017) Application of converted mode for defect defection in plate. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Non-Destructive Testing (NDT) is mainly use to testing, inspecting, and evaluating materials or components without destroying the any part of the structures. This study investigate the propagation of guided wave through experimental on Lamb wave propagation on plates. It was aimed study the behavior of wave interaction around defects by studying the behavior of mode conversion from defects. A composite PZT transducer was used to generate S0 mode whereas an angle beam transducer was used to measure the reflected wave from defect in plates. Two types of transducer shoes used to form the angle transducers that made of acrylic and aqualane materials. The acrylic and aqualene shoes were designed to be predominantly sensitive to S0 and A0 modes, respectively. Investigations on the mode conversion were carried out on plate with groove defects at different depths. Effect of the frequency shift from the central frequency of the PZT transducer which is designed at 100 kHz also been observed through the excitation at 80 kHz and 120 kHz, respectively. The mode conversion is predicted to be appeared after the reflected wave of S0 mode from defects which is not at the arrival time of the reflected wave of A0 mode from defects.

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