Dynamic Resonance of Curved Panels in Adverse Hygrothermal Environment

Table 1

Convergence study of free vibration for c-c-c-c four-layered laminated composite plates for two different lamination sequences at 325°K temperatures.

Mess division	Nondimensional frequencies at 325°K temperature
	0/90/90/0	45/−45/−45/45
4 × 4	8.079	11.380
6 × 6	8.039	10.785
8 × 8	8.036	10.680
10 × 10	8.036	10.680

𝑎/𝑏=1; and 𝑎/𝑡=100 at 𝑇=300°K; 𝐸₁=130 Gpa; 𝐸₂=9.5 Gpa; 𝐺₁₂=6 Gpa; 𝐺₁₃=𝐺₁₂; 𝐺₂₃=0.5𝐺₁₂; 𝜈₁₂=0.3; 𝛼₁=−0.3×10⁻⁶/°K; 𝛼₂=28.1×10⁻⁶/°K.
Nondimensional frequency: 𝜆=𝜔_𝑛𝑎²𝜌/𝐸₂𝑡².