Experimental Study of Free Vibration Fibre Reinforced Laminated Fractured Composite Beams

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Experimental Study of Free Vibration Fibre Reinforced Laminated Fractured Composite Beams

Year : 2024

Publisher : Springer Science and Business Media Deutschland GmbH

Source Title : Lecture Notes in Mechanical Engineering

Document Type :

Abstract

In this paper, the free vibration analysis for the fundamental mode of vibration of fibre reinforced laminated fractured composite beams has been carried out. The beams are manufactured by hand lay-up method using glass as fibre material and epoxy resin as matrix material. The material properties are obtained from Universal Testing Machine. The analysis is carried out for different lamination schemes, boundary conditions, and number of cracks. The free vibration frequencies for the fundamental mode of vibration and Time-History are obtained from LabVIEW. The acceleration data for the dynamic response of the beam are obtained from an accelerometer fixed on the middle of the beam. The experimental stress and modal analysis of glass fibre reinforced laminated composite beam has been carried out for clamped-clamped and clamped-free end conditions. The experimental results obtained from LabVIEW are compared with the FE simulation results obtained from ANSYS using shell 8 node 281 elements. It is observed that in case of [0°]4 specimen, the free vibration of frequency of the beam is decreasing with increase in number of cracks, whereas in the case of [0°]8 the frequency of the beam has no significant change even if the number of cracks are varied. But the frequency is increased when the number of layers are increased irrespective of the crack. For [0°/90°]2 cross-ply laminate the free vibration frequencies decreases as number of crack increases. For [0°/90°]2 lamination scheme the maximum value of stress for zero crack beam is at the clamped end and for Single, Double, Triple crack beams the maximum stress value is found at the position of first crack and the value is higher than that of beam with zero crack, whereas for [0°/90°]4 the maximum stress values for Single, Double, Triple crack beams are lower when compared to the beam with Zero crack.