Experimental Vibration Analysis on E-Glass/Epoxy and Jute/Epoxy Composite Plates

The present work focus on the determination of experimental modal frequency of fabricated laminate composite plates under cantilever boundary condition. For the fabrication of composite, E-glass and Jute fiber are chosen as a reinforcement material and epoxy as a matrix. Using the hand lay-up method, E-glass/Epoxy (G/E plate) and Jute/Epoxy (J/E plate) composite plates are fabricated. Two different dimensions of the rectangle and trapezoidal geometry were chosen for vibration analysis. A sinusoidal wave was used as input to an electromagnetic shaker to vibrate the specimen subjected to a cantilever boundary condition. The vibration signals of the excited plate were absorbed by a single axis accelerometer and stored in the digital signal oscilloscope. A MATLAB program using Fast Fourier Transformation (FFT), natural frequencies corresponding to first three modes on G/E and J/E plates were obtained and compared. J/E plates give high frequency than G/E plates. Trapezoidal geometry performs well than rectangular geometry irrespective of the composites. This finding provides better insight about the geometries, dimensions and experimental procedure on composite materials to the beginners.