Table 6.

Natural frequency ω (MHz) of 3D-GrF microshell with different radius-to-thickness ratios (3D-GrF-I).

R/h	SS–SS	C–SS	C–C	C–F	F–F	F–SS
20	4.237	4.818	5.309	3.097	5.442	4.478
30	2.174	2.553	2.835	1.427	2.884	2.289
40	1.419	1.707	1.906	0.840	1.928	1.490
50	1.048	1.281	1.436	0.567	1.447	1.097
60	0.830	1.027	1.154	0.417	1.160	0.869
70	0.689	0.859	0.967	0.326	0.970	0.720
80	0.589	0.739	0.833	0.265	0.835	0.615
90	0.516	0.649	0.732	0.223	0.733	0.538
100	0.459	0.579	0.654	0.192	0.654	0.478