Analysis of Sandwich Plates by Generalized Differential Quadrature Method

Table 5

The normalized fundamental frequency of the simply supported cross-ply laminated square plate [0^∘/90^∘/90^∘/0^∘] (𝑤=(𝑤𝑎²/ℎ)𝜌/𝐸₂,ℎ/𝑎=0.2).

Method	Grid	𝐸1/𝐸2
		10	20	30	40
Liew et al. [50]		8.2924	9.5613	10.320	10.849
Exact (Khdeir and Librescu) [49]		8.2982	9.5671	10.326	10.854
Present	11×11	8.5846	9.8384	10.5695	11.0649
	15×15	8.5846	9.8384	10.5696	10.0649
	19×19	8.5846	9.8384	10.5695	10.0649