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

Table 11

Various aspect ratios of plate.

Aspect ratio		Cut-out size at which lowest is obtained	% of reduced, when compared with a plate without cut-out
0.4	0.2	0.6	20.6
0.8	0.2	0.2	3.16
1	0.2	0.2	2.82
1.5	0.2	0.2	4.67
2	0.2	0.3	8.61