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Modeling and Simulation of a Cracked Beam with Different Location Using FEM

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Document pages: 14 pages

Abstract: Nowadays presence of crackin different engineering structures becomes a serious threat to theperformance. Since most of the civil and mechanical structures may be damageddue to material fatigue, mechanical vibration, environmental attack andlong-term service. Moreover, dynamical systems of a beam usually possess anon-linear character, which causes practical difficulties on the model-based damage detection techniques.This paper presents a novel approach to detect damage in a simply supportedbeam. In this study, a numerical simulation using the Finite Element Method(FEM) has been done to determine the frequencies to detect the crack in aconcrete beam of length 0.12 m and width 0.015 m. A vibration-based model isemployed to simulate the results by using COMSOL Multiphysics. At the tip, byperforming the computational analysis it is found that the presence of cracksaffects the natural frequencies of the concrete structure. It is observed that after applying load, the frequencies of the cracked beam have been changed with the variation of the location of the crack for all the modes of vibration. It also found thatmaximum frequency reserved at the cracked point so it will also help us todetect different hidden defects in any structure. A comparisonis also made with the experimental results. It is also found that the effect ofcrack is more near the fixed end than atthe free end.

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