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

Table 3

Type A: 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	113.1143	119.1696	125.1222	130.5536	134.4407	132.8545
	1	2	275.9721	290.6332	304.9596	317.8596	326.8175	323.2968
	2	1	288.9092	304.2515	319.2424	332.7445	342.1682	338.6695
	2	2	451.2983	475.0157	497.9900	518.2752	531.6414	525.1794
	1	3	546.5282	575.1648	602.8417	627.1444	642.9709	636.4158
1	1	1	148.2252	161.6798	176.7878	193.6571	212.2255	231.0084
	1	2	361.5727	394.2069	430.6859	470.9909	513.9364	550.1039
	2	1	378.5149	412.6644	450.8250	492.9580	537.7648	575.2849
	2	2	591.2158	644.2299	703.1958	767.6059	833.8414	878.1383
	1	3	715.8673	779.8603	850.8524	927.9117	1005.5225	1049.0553
2	1	1	177.6786	192.2506	207.2047	222.1366	236.3566	246.6403
	1	2	433.3435	468.6475	504.6524	540.0343	571.8150	583.0676
	2	1	453.6414	490.5800	528.2335	565.1887	598.2265	608.9659
	2	2	708.4573	765.7574	823.8039	879.8600	926.9166	923.8460
	1	3	857.7251	926.8319	996.5809	1063.2875	1117.1166	1100.4585
5	1	1	211.5154	217.4290	224.2472	232.1923	241.0141	247.6679
	1	2	515.5570	529.7031	545.8134	564.0796	582.5511	584.4944
	2	1	539.6793	554.4651	571.2873	590.3178	609.4069	610.3341
	2	2	842.3328	864.9783	890.4173	918.3691	943.4398	924.5607
	1	3	1019.4419	1046.5443	1076.7582	1109.3650	1136.4637	1100.5041