Free Vibration Analysis of the Unified Functionally Graded Shallow Shell with General Boundary Conditions

Table 1

Spring stiffness values for the various boundary conditions of FGM shallow shell.

Edges	BC	Spring stiffness values
			F	0	0	0	0	0
C	10^15		10^15	10^15	10^15	10^15
S	0		10^15	10^15	0	10^15
E^1	10^8		10^15	10^15	10^15	10^15
E^2	10^8		10^8	10^15	10^15	10^15
E^3	10^8		10^8	10^8	10^15	10^15
	F	0	0	0	0	0
	C	10^15	10^15	10^15	10^15	10^15
	S	10^15	0	10^15	10^15	0
	E^1	10^15	10^8	10^15	10^15	10^15
	E^2	10^8	10^8	10^15	10^15	10^15
	E^3	10^8	10^8	10^8	10^15	10^15