The effect of fibre orientation on the frequencies of thin, rhombic, orthotropic plates has been studied using a parallelogrammic, orthotropic plate finite element for various boundary conditions and skew angles. The results indicate that, for a given skew angle and boundary conditions, the fibre orientation of such plates can be chosen to achieve the desired natural frequency. © 1988.

Natrajan Ganesan

M. A. Veluswami

PLATES - VIBRATIONS

Fiber orientation

SKEW ANGLE

VIBRATION ORTHOTROPIC PLATES

Composite materials

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Effect of fibre orientation and boundary conditions on the vibration behaviour of orthotropic rhombic plates

Composites

A general high precision triangular plate bending finite element has been extended to the free vibration analysis of laminated skew plates by deriving the consistent mass matrix in explicit form. The boundary conditions on the skew edges are imposed through the transformed element matrices. The accuracy of the present formulation has been verified against literature values. The fundamental frequencies are obtained for simply supported and clamped antisymmetric angle-ply skew laminates. In this analysis, the effects of skew angle, fibre orientation angle, number of layers and stacking sequence on the fundamental frequency have been studied. The frequencies are found to increase with skew angle. Also, the skew angle is seen to have considerable influence on the variations of the frequencies with fibre orientation angle and number of layers in the laminate.

Computers and Structures

Free vibration of skew laminates

Journal of Sound and Vibration

Vibration of skew laminates

Journal	Composites
ISSN	00104361
Open Access	No