Free Vibrations and Impact Resistance of a Functionally Graded Honeycomb Sandwich Plate

Table 4

Type B: the first five natural frequencies of the simply supported FGH sandwich plate.

Volume fraction index (N)	m	n	Core thickness (hc/m)
			0.004	0.005	0.006	0.007	0.008	0.009
0	1	1	93.8293	98.76310237	103.5649	107.8586	110.7274	108.5318
	1	2	226.9837	238.1190884	248.6973	257.9076	264.0070	260.1520
	2	1	237.2285	248.7270141	259.6171	269.0838	275.3979	271.6402
	2	2	355.8742	369.0205917	380.7708	390.4503	396.5941	392.4074
	1	3	414.6251	427.054062	438.0477	447.2150	453.5988	452.2424
1	1	1	93.9876	99.0091734	103.9421	108.4404	111.6602	110.3572
	1	2	227.3491	238.6789793	249.5414	259.1763	265.9495	264.0463
	2	1	237.6063	249.3051434	260.4864	270.3873	277.4007	275.7181
	2	2	356.4367	369.9074751	382.1595	392.6546	400.2923	400.5990
	1	3	415.2020	427.9615474	439.4731	449.5008	457.5133	461.1549
2	1	1	94.0404	99.0913374	104.0678	108.6324	111.9534	110.9047
	1	2	227.4669	238.8557671	249.7981	259.5354	266.3934	264.7569
	2	1	237.7276	249.4855364	260.7459	270.7446	277.8313	276.4339
	2	2	356.5854	370.1171245	382.4453	393.0287	400.7142	401.2751
	1	3	415.3283	428.1261526	439.6789	449.7417	457.7164	461.3341
5	1	1	94.0933	99.17355126	104.1936	108.8238	112.2351	111.3560
	1	2	227.5803	239.0210756	250.0285	259.8343	266.6629	264.7135
	2	1	237.8432	249.6518918	260.9730	271.0286	278.0539	276.3188
	2	2	356.7005	370.2522101	382.5782	393.0962	400.4581	399.8910
	1	3	415.3939	428.1643223	439.6385	449.5104	456.9349	458.6987