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.
.
Keywords— GFRP,
Nylon, Aluminium, Natural Frequency, Mode Shapes.
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