Search

The present study deals with the free vibration analysis of laminated compo-site plates containing a circular hole or cut-out. The Finite Element (FE) analysis is used to study the influence of the type of material, size of the hole, aspect ratio of the plate and position of the circular hole on the natural frequency of the system. Three materials namely Glass-Epoxy, Boron-Epoxy and Graphite-Epoxy are considered for the simulation of plates containing a circular hole at the center for different boundary conditions. Influence of dimensions of rectangular plates on natural frequencies is presented by considering different aspect ratios under various boundary conditions. Distinct aspect ratios are achieved by varying length of the plate keeping width dimension constant. The study is also extended to understand the effect of position of the circular hole in the plate on modal behavior of the composite plate under different boundary conditions. [ABSTRACT FROM AUTHOR]

The paper presents free vibration of shape memory alloy hybrid composite beams by experimentally. The hybrid composite beams are fabricated using glass fiber with epoxy resin matrix implanted with the Ni-Ti SMA wires with diameter 0.47mm. The rectangular cross-section of beams with sizes, thickness, 3mm, width, 20mm and length 250mm are considered in the investigation. Free vibration test has been performed for the cantilever beams to investigate the effect on the fundamental natural frequency shift by changing the current as well as increasing the number of SMA wires. The fundamental natural frequency of the beam has shifted on higher side, 12.82% for single wire and 35.48% for two wires implant under the influence of current in comparison with no current state. Further, as supplied current increases in the SMA wire the natural frequency of beam increases helps in improving the stiffness and encourages to avoid resonance state. [ABSTRACT FROM AUTHOR]

This article presents the investigation of skew multiphase magneto-electro-elastic (MMEE) plate to assess its free vibration characteristics. A finite element (FE) model is formulated considering the different couplings involved via coupled constitutive equations. The transformation matrices are derived to transform local degrees of freedom into the global degrees of freedom for the nodes lying on the skew edges. Effect of different volume fraction (Vf) on the free vibration behavior is explicitly studied. In addition, influence of width to thickness ratio, the aspect ratio, and the stacking arrangement on natural frequencies of skew multiphase MEE plate investigated. Particular attention has been paid to investigate the effect of skew angle on the non-dimensional Eigen frequencies of multiphase MEE plate with simply supported edges. [ABSTRACT FROM AUTHOR]