Modal Analysis of Thin FRP Skew Symmetric Cross-Ply Laminate with Elliptical Cutout

The present work deals with the free vibration analysis of a thin Fiber Reinforced Plastic (FRP) skew laminated composite plate with an elliptical cutout. The problem is modeled in ANSYS software based on the Classical Lamination Theory (CLT) which is suitable for the analysis of thin laminates. The first five natural frequencies of the skew plate are evaluated by changing the skew angle and the number of the layers of the laminate. The laminate considered for the present analysis is a symmetric cross-ply laminate. The length-to-thickness ratio is maintained as 50. The major axis of the elliptical cutout is selected from the a/l ratio which is taken as 0.2. The major axis to minor axis ratio of elliptical cutout is taken as 2. The variations of the first five natural frequencies with respect to the skew angle and number of layers are presented.