Thursday, 9 July 2015

Numerical Analysis of Crack Effect on Natural Frequency of Cantilever Composite Beam



Numerical Analysis of Crack Effect on Natural Frequency of Cantilever Composite Beam

Arpit Kumar1, Vipin Kumar2

1, 2 M.Tech Student, Department of Mechanical Engineering, NITTTR Chandigarh, INDIA


Abstract The presence of cracks on a beam causes changes in the physical properties which introduces flexibility, and reduce the natural frequency of the beam. The crack in a structural member always remains open during vibration. However, this assumption may not be valid when dynamic loadings are dominant.
This study is an investigation of the effects of cracks on a cantilever composite beam, made of Aluminium- reinforced GFRP and Aluminium reinforced Nylon. . The mechanical properties of aluminum and fibers (Nylon and Glass fiber reinforcement polymer) are measured with universal testing machine. The beams are made of Aluminium and synthetic fibers of dimensions 500x30x6 mm. The Cracks are provided on the cantilever beam which is varying from 10 to 90% of beam length, and we investigate the natural frequency of all five mode shapes with zero cracks to ninth cracks on the beam. The finite element model agrees well with the analytical values.
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Keywords GFRP, Nylon, Aluminium, Natural Frequency, Mode Shapes.

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