[Retracted] Free Vibration Analysis of Thick Rectangular and Elliptical Plates with Concentric Cut-Out

Table 12

Various thickness ratios of plate.

Aspect ratio		Cut-out size at which lowest is obtained	% of reduced, when compared with a plate without cut-out
2	0.2	0.3	11.18
2	0.4	0.6	13.37
2	0.6	0.6	27.57