International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 04 | Apr -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
Crack detection in composite cantilever beam by Vibration analysis and Numerical method Soham S. Vader1, V. A. Raikar2 1Research
Scholar, Dept. of Mechanical Engg., SGI Atigre,416118,India. Professor, Dept. of Mechanical Engg., SGI Atigre,416118,India. -----------------------------------------------------------------------------------------------------------------------------------------------------------2
Abstract- The structural members are important part of buildings or mechanical system. It is required that the structure must work safely during its service life; most of the failures encountered are due to the material fatigue. This results in structural defects such as cracks, which as time progresses leads to the failure or breakdown of structure. Therefore researchers are paying attention to identify the crack and its severity prior to failure without aborting the system. The presence of crack in structure causes changes in the stiffness of that structure which results in change in frequencies and amplitudes of free vibration of structure. The objective of this work is to evaluate the changes in natural frequencies of cantilever composite beam made of Glass Epoxy. The effect of location and depth of crack on the natural frequency of beam with transverse open crack is explored. The numerical results were found in good agreement with the experimental results. The result of the study concludes that, presence of crack drops the natural frequencies and changes the mode shape of vibration. Keywords: crack, composite beam, natural frequency, experimental, numerical.
Nomenclature: w -Width of beam h -Thickness of beam a -Depth of crack L -Length of beam -Distance of crack from left and support E-Young’s modulus I -Moment of inertia of beam cross section -Mass density of beam A-Cross-sectional area of beam -Natural frequency (Hz)
1. INTRODUCTION Beams are the basic structural components; they can be used for different application such as in high speed machinery, aircraft and light weight structures. Composite materials are being used more frequently in many different engineering fields because of high strength, low weight, resistance to corrosion, impact resistance, and high fatigue strength. Cracks in a structure may be hazardous due to static or dynamic loadings; hence crack detection plays an important role for structural health monitoring applications.
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