Vibration Analysis of Multilayered Beam of Graphite Epoxy, Epoxy E-Glass Composites
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Abstract
A Beam is a basic structural element that primarily resists loads applied laterally to its axis. Beams have a wide range of engineering applications such as airplane wings, Helicopter blades, robot arm, medical instruments, turbine blades, automotive industries, sports equipment etc. When these beams are made up of laminated composites their strength to weight ratio increases and these can be used in different applications by varying the stacking sequence in the laminate with same weight and dimensions. So, this requires a complete analysis of laminated composite beams. It is important to study modal analysis of composite structures as they operate in complex environmental conditions and are frequently exposed to a variety of dynamic excitations. So, this work aims to study the natural frequencies and mode shapes of four layered composite beam under various stacking sequences, materials and boundary conditions. In this research work classical beam theory is used for vibration analysis and non-dimensional natural frequencies are calculated by FEM modal prepared by using 281 shell element which is having 8 nodes with six Degrees of Freedom (DOF) at each node in ANSYS APDL. Finally, a MATLAB code is developed to validate the results obtained in ANSYS. It is observed that as the angle of orientation increases the natural frequency decreases, as the stiffness increases the natural frequency increases.
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