Nonlinear Free Vibration for Viscoelastic Moderately Thick Laminated Composite Plates with Damage Evolution

Table 3

Effect of viscoelasticity parameter on the nonlinear vibrating frequency ${\mathrm{\Omega }}^{*}$ of laminated plates $(a/h=15)$.

$\alpha$	Case	$w_{\max \hspace{0.17em}}/h$
		1	1.5	2	2.5	3
0	$T_d=0$	0.850871	1.07477	1.35062	1.61494	1.85181
	$T_d=1$	0.837562	1.04704	1.28289	1.46316	1.49701
0.5	$T_d=0$	0.846744	1.06551	1.31475	1.56880	1.84306
	$T_d=1$	0.838762	1.05061	1.25715	1.42693	1.49761
2	$T_d=0$	0.820509	1.04718	1.28120	1.53075	1.79590
	$T_d=1$	0.820229	1.04668	1.25565	1.42815	1.47021