VIBRATION AND VISCOELASTIC CHARACTERISTICS OF SISAL FIBER REINFORCED POLYESTER COMPOSITE

This study aims to evaluate the result of experimental investigation carried out on free vibration characteristics
and dynamic mechanical analysis over a range of temperature and five different frequencies of short sisal fiber polyester
composite. The effect of temperature on the storage modulus (E’), loss modulus (E”), and loss factor or damping
efficiency (tanδ) is determined. Composites specimen is fabricated in random fiber orientation using to hand lay-up
method by Influence of fiber length (10mm) and weight percentage (5, 10, 15, 20wt. %). Studies revealed that increase in
the fiber content will increase the natural frequency (Hz) and storage modulus (E’) and the maximum is given by the
composites having a fiber loading of 20 wt. % at all temperature ranges. The peak height of loss modulus (E”) and
damping curves (tan δ) were lowered with respect to the fiber content. The properties were compared with neat polyester.
In this work increasing fiber content increases the natural frequency (Hz) and storage modulus (E’) of the composite.