Investigation The Relation Of Crack Modes With Resonances Excitation In Beam Structure

Noor Fariza, Saari (2011) Investigation The Relation Of Crack Modes With Resonances Excitation In Beam Structure. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In order to obtain the most useful damage detection, the crack related to resonance in beam structure need to be enhanced. It is required that the structure must safely work during its service life. But damage initiates a breakdown period on the structure. Cracks in a structure may be hazardous due to static or dynamic loadings, so that crack or damage detection plays an important role for structural health monitoring application. Beam type structures are being commonly used in construction and machinery industries. Studies based on structural health monitoring for crack detection deal with change in natural frequencies and mode shapes of beam. By this study, its aims are to determine the most effective vibration mode excitation produce the most effective crack edge and to apply the finite element modeling to analyze vibration response from cracked and uncracked beam. The study focuses to simulation approach by developing model of cracked and uncracked beam for modal analysis by using finite element method. The material property of beam is aluminum caused by its homogeneous mechanical properties. By this approach, it presents that the behavior of crack mode is due to three different crack modes with low frequency vibration. When, the beam is excited, the contact surface of crack will move away from the origin position. Thus, we can investigate the movement that interacts with the crack surface corresponding to the crack modes which are opening/closing, sliding and shearing.

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