Table 1: Non-dimensional fundamental frequencies ( ) for hypar shells (lamination (0/90)4) with concentric cutouts.

Chakravorty et al. [1]Present finite element model
Simply supportedClampedSimply supportedClamped

0.050.829111.60050.57350.82150.825111.445111.592111.612
0.150.769110.16650.67950.75850.779109.987110.057110.233
0.250.434105.46450.32350.42150.400105.265105.444105.443
0.349.165101.35049.04549.15749.178101.110101.340101.490
0.447.24497.98747.13247.24247.14197.67097.98597.991

, , , ; , , , .