Flutter Characteristic Study of Composite Sandwich Panel with Functionally Graded Foam Core

Table 4

Optimum design variables and laminate configuration.

(mm)	(mm)	(kg/m^3)	(kg/m^3)				Sandwich
10	0.125	20	37.64	0	−1	−0.076

denotes a 45 degree ply with 0.05775 mm, denotes a −45 degree ply with 0.06725 mm, and denotes a core with thickness of 5 mm. means that the type of sandwich is symmetric.