Active Constrained Layer Damping of Smart Skew Laminated Composite Plates Using 1–3 Piezoelectric Composites

Table 2

Comparison of fundamental natural frequencies (𝜔) of clamped-clamped skew laminated composite plates integrated with the patches of negligible thickness.

Skew angle	Source	Symmetric cross-ply			Antisymmetric cross-ply			Antisymmetric angle-ply
		(90°/0°/90°/0°/90°)			(0°/90°/0°/90°)			(45°/−45°/45°/−45°)
		Modes			Modes			Modes
		1	2	3	1	2	3	1	2	3
0°	Reference [41]	2.3687	3.5399	4.1122	2.2990	3.7880	3.7880	2.2119	3.7339	3.7339
	Present FEM	2.3201	3.4769	4.4102	2.3315	3.6531	3.6545	2.2433	3.6000	3.6012
15°	Reference [41]	2.4663	3.6255	4.3418	2.3809	3.7516	4.0785	2.3099	3.6997	4.0438
	Present FEM	2.3699	3.4821	4.4049	2.3741	3.5856	3.8401	2.3049	3.5346	3.8092
30°	Reference [41]	2.7921	3.9557	5.0220	2.6666	3.9851	4.7227	2.6325	3.9549	5.2107
	Present FEM	2.5366	3.5696	4.4734	2.5240	4.1943	4.5373	2.4945	3.6113	5.0932
45°	Reference [41]	3.4739	4.7129	5.8789	3.3015	4.6290	5.8423	3.3015	4.6290	5.8423
	Present FEM	2.8665	4.7074	5.4562	2.8377	4.7614	5.6620	2.8377	4.7614	5.5162