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| dc.description.abstract | This resarch is to study the effect of the fiber
orientation on the dynamic characteristic of the carbon-glass
fiber hybrid composite. The dynamic charactristics studied was
damping ratio and natural frequency. The hybrid composite was
made by hand lay up medtod using volume fraction of 0.4 and
dimension of 250 x 40 x 3 mm. Fiber orientations used in this
experiment were 0
o
/90
o
, 30
o
/60
o
, and 45
o
/45
o
. The vibration
experiment was done by giving excitation to the composite
specimen using impact hammer and the vibration response was
obtained from the accelerometer attached on the specimens.
Three type of the supported beam configurations used in this
experiment, i.e: cantilever beam, simple supported beam, and
fixed supported beam. The experiment results showed that the
fiber orientation affects to the dynamic characteristics of the
carbon-glass fiber hybrid composite. This is due to the flexular
rigidity of the composites. Fiber orientation of 0
o
/90
have the
highest flexular rigidity, so it have high natural frequencies at all
beam configuration in compare to the other fiber orientation. Its
natural frequencies at at the configuration cantilever beam,
simple supported beam, and fixed beam are 39 Hz, 105 Hz, and
261 Hz respectively. Damping ratio behave in opposite way to the
natural frequency, carbon-glass fiber hybrid composite which
low rigidity i.e. fiber orientation of 45/45 gives high damping
ratio in all beam configuration, and the highest is 0.0038 found in
cantilever beam configuration. | en_US |
