Free and Forced Vibration Characteristics of a Flax Fibre Reinforced Composite Beam with Viscoelastic Core

TitleFree and Forced Vibration Characteristics of a Flax Fibre Reinforced Composite Beam with Viscoelastic Core
Publication TypeConference Proceedings
Year of Conference2019
AuthorsPrasad, K. S. Srinivas, M. K. N, and N. Singh
Conference NameSixth International Conference on Recent Advances in Composite Materials
Conference LocationIIT BHU Varanasi
KeywordsDepartment of Mechanical Engineering
Abstract

In this study, free and forced vibration characteristics of a flax fibre reinforced composite beam with a viscoelastic core have beeninvestigated using theoretical and experimental approaches. The theoretical approach involves finite element method incorporatinglayerwise modelling considering classical laminate theory for top and bottom composite face sheets. The transverse displacementfield is assumed to be same for all the layers, whereas the axial displacement field for the viscoelastic core is linearly interpolatedin terms of the displacements of the two face sheets. Natural Frequencies of the beam in cantilever configuration and transientresponse of the tip of the beam subjected to base harmonic excitation have been determined under the theoretical approach. Theexperimental approach involves sine sweep testing and base excitation testing for determination of natural frequencies and transientresponse of the tip respectively and the tests have been done using an electrodynamic shaker. The results obtained from both theapproaches agree closely with each other and illustrate the effect of introduction of viscoelastic core in the composite beam.