Abstract
The current study focussed on analysing natural frequency and damping of laminated composite beams (LCBs) by varying fiber angle, aspect ratio, material property and boundary conditions. Ritz method with displacement field based on the shear and normal deformable theory is used and the modal damping is calculated using modal strain energy method. Effects of symmetric angle-ply and cross-ply, anti symmetric cross-ply, balanced and quasi-isotropic lay up schemes on modal damping are presented for the first time. Results revealed that influence of lay-up scheme on natural frequencies is significant for the thin beams while the modal damping of the thin beams are not sensitive to lay-up scheme. However, the lay-up scheme influences the damping significantly for the thick beams. Similarly, high strength fiber reinforced LCBs have higher natural frequency while low strength fiber reinforced LCBs have higher damping due to the better fiber-matrix interaction.
Highlights
Fibre reinforced laminated structures are always in demand because of high strength and very less weight
The study intended to predict the effect of boundary conditions, aspect ratio and various types of laminate schemes on natural frequency and damping of glass epoxy and carbon epoxy laminated composite beams (LCBs)
In order to analyse thick and thin beam cases, the LCB is investigated for two aspect ratios (L/h = 5 and 20)
Summary
Fibre reinforced laminated structures are always in demand because of high strength and very less weight. Chandra et al [12] presented a detailed study on damping of laminated composites and reported that modal strain energy method is used in general to estimate the damping theoretically. Literature study revealed that damping analysis of LCBs is very important for its design considering vibration and other dynamic effects. The effect of aspect ratio, structural boundary conditions and type of FRP material (carbon-epoxy and glass-epoxy) on the natural frequency and damping of LCBs investigated in this work.
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