Table 7.

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

R/h	SS–SS	C–SS	C–C	C–F	F–F	F–SS
20	4.182	4.765	5.254	3.045	5.382	4.420
30	2.154	2.534	2.816	1.405	2.863	2.268
40	1.410	1.698	1.898	0.828	1.919	1.480
50	1.043	1.277	1.432	0.560	1.443	1.092
60	0.828	1.025	1.153	0.412	1.158	0.866
70	0.687	0.858	0.966	0.322	0.969	0.718
80	0.589	0.739	0.833	0.263	0.834	0.615
90	0.515	0.649	0.732	0.221	0.733	0.538
100	0.458	0.579	0.654	0.191	0.654	0.478