Transverse Vibration Analysis of Composite Plates with Multiple Distributed Composite Patches

Table 2

Nondimensional frequencies of the cross-ply laminate ([0/90]s) with CCCC boundary condition, E1/E2 = 20, and a = b = 10 h and for different patch sizes and numbers.

Modes		1st	2nd	3rd	4th	5th	6th	7th	8th	9th
Present	0 × 0	5.711	8.350	13.622	14.602	16.094	19.709	21.263	25.955	28.241
CASE I	0.1 × 0.1	5.643	8.346	13.508	14.595	16.105	19.702	21.234	25.974	27.990
	0.2 × 0.2	5.471	8.292	13.327	14.502	16.114	19.633	20.932	25.944	27.581
	0.3 × 0.3	5.266	8.117	13.308	14.199	16.007	19.537	20.423	25.642	27.599
CASE II	0.1 × 0.1	5.593	8.343	13.426	14.590	16.113	19.697	21.212	25.988	27.781
	0.2 × 0.2	5.306	8.248	13.145	14.427	16.129	19.578	20.687	25.935	27.130
	0.3 × 0.3	4.989	7.950	13.142	13.905	15.942	19.431	19.886	25.415	27.258
CASE III	0.1 × 0.1	5.513	8.338	13.298	14.581	16.126	19.688	21.175	26.011	27.415
	0.2 × 0.2	5.059	8.176	12.898	14.300	16.153	19.491	20.289	25.921	26.515
	0.3 × 0.3	4.609	7.688	12.945	13.438	15.834	19.147	19.288	25.054	26.858