Fatigue Crack Detection In Aluminium Pipe By Using Non-Linear Vibro Acoustic Method

Hooi, Man Poh (2020) Fatigue Crack Detection In Aluminium Pipe By Using Non-Linear Vibro Acoustic Method. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (24 Pages) Fatigue Crack Detection In Aluminium Pipe By Using Non-Linear Vibro Acoustic Method.pdf - Submitted Version Download (505kB)

Abstract

Fatigue crack presence is the most common structural failure and there are several factors to cause fatigue crack. In this research non-linear vibro acoustic method has been introduced for the crack detection on aluminium pipe. Non-linear vibro acoustic approach is the most appropriate method for detecting the existence of fatigue crack as it is very sensitive even to a very tiny damage severity. The nonlinear vibro-acoustic modulation is a technique which combined the intensive low frequency (modal) excitation and high frequency ultrasonic wave. Several procedures have been taken for this project including the preparation of the test specimen, the modal analysis test and the vibro-acoustic test. The test specimen used in this experiment is a 102.3mm x 114.3mm x 1000mm aluminium pipe (Al-6061). A slot size with dimension 10mm x 2mm was created by using milling machine on test specimen. The test specimen undergoes modal test analysis to determine the resonant frequencies and followed by the vibro-acoustic method. Data from modal analysis is applied in vibro-acoustic test as low frequency excitation with 60kHz high ultrasonic wave. The vibro-acoustic test used is to accomplish the goal of performing the non-linear vibro acoustic test at aluminium pipe with different slot size in detecting the fatigue crack. Modulation intensity (R-value) is obtained by calculation and related to effect of the size dimension

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