Transverse Vibration Analysis of Composite Plates with Multiple Distributed Composite Patches

Table 6

Nondimensional frequencies of the cross-ply laminate ([0/90]s) with SSSS boundary condition, E1/E2 = 10, a = 2b, and b = 10 h and for different patch sizes and numbers.

Modes		1st	2nd	3rd	4th	5th	6th	7th	8th	9th
Present	0 × 0	1.246	2.519	4.175	4.978	4.986	6.905	8.515	9.159	9.783
CASE I	0.1 × 0.1	1.242	2.519	4.175	4.959	4.989	6.904	8.514	9.126	9.783
	0.2 × 0.2	1.228	2.518	4.167	4.910	4.996	6.893	8.500	9.055	9.780
	0.3 × 0.3	1.208	2.514	4.140	4.851	5.004	6.855	8.448	9.012	9.772
CASE II	0.1 × 0.1	1.238	2.519	4.174	4.945	4.991	6.903	8.513	9.101	9.783
	0.2 × 0.2	1.215	2.517	4.162	4.862	5.003	6.884	8.488	8.979	9.777
	0.3 × 0.3	1.182	2.509	4.115	4.768	5.016	6.820	8.397	8.916	9.764
CASE III	0.1 × 0.1	1.232	2.519	4.174	4.922	4.994	6.902	8.512	9.059	9.782
	0.2 × 0.2	1.194	2.516	4.152	4.788	5.015	6.869	8.469	8.859	9.773
	0.3 × 0.3	1.141	2.502	4.071	4.650	5.036	6.762	8.312	8.780	9.752