Linear and Nonlinear Dynamic Analyses of Sandwich Panels with Face Sheet-to-Core Debonding

Table 3

Comparison of natural frequencies (Hz) of intact and debonded foam cored sandwich beams.

Mode	Intact			Debonded
	[53]	[55]	Present	[53]	[55]	Present
(1)	289.3	293.52	293.46	288.98	293.52	293.07
(2)	683.3	722.96	707.09	388.32	360.81	433.67
(3)	1096.9	1139.51	1106.7	1093.2	1139.31	1093.2
(4)	1151.6	1545.91	1495.8	1146.9	1146.32	1132.0
(5)	1778.2	-	1818.7	1771.3	1769.9	1769.9
(6)	1895.3	1863.62	1918.1	1842.2	1948.35	2080.2