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Shock and Vibration
/
2019
/
Article
/
Tab 1
/
Research Article
A Semianalytical Approach for Free Vibration Characteristics of Functionally Graded Spherical Shell Based on First-Order Shear Deformation Theory
Table 1
The spring stiffness values of the general boundary restraints.
BC
φ
F
0
0
0
0
0
SD
0
10
3
E
c
10
3
E
c
0
0
SS
10
3
E
c
10
3
E
c
10
3
E
c
0
10
3
E
c
C
10
3
E
c
10
3
E
c
10
3
E
c
10
3
E
c
10
3
E
c
E1
10
−3
E
c
10
3
E
c
10
3
E
c
10
3
E
c
10
3
E
c
E2
10
3
E
c
10
−3
E
c
10
3
E
c
10
3
E
c
10
3
E
c
E3
10
−3
E
c
10
−3
E
c
10
3
E
c
10
3
E
c
10
3
E
c
