Free Vibration of Functionally Graded Sandwich Shallow Shells on Winkler and Pasternak Foundations with General Boundary Restraints

Figure 8

The difference of frequency parameters Ω obtained by CSST and FSDSST for simply supported FGSSS with different thickness ratios h/a and curvature types: (a) plate; (b) circular cylindrical shallow shell; (c) spherical shallow shell; (d) hyperbolic paraboloidal shallow shell. (m and n represent the modal number in the direction of x and y, respectively).

(a)

(b)

(c)

(d)