Abstract
Composite materials (fiber reinforced plastics: FRP) present the excellent possibility of design for changing in structural stiffness with tailoring the fiber-direction or ply-orientation. In this study, the Ritz method has been employed for different length to width ratio and fiber orientation angles within code-wise plate bending deformation. In applying the Ritz method, the frequency and its mode pattern is calculated and studied as the cantilevered (CFFF boundary condition) unbalanced laminated FRP plates with bend/twist cross-coupling parameter. Obtained result is follows. The first, the nodal lines are skewed with respect to the plate axis. The second, bend/twist mode is controlled with coupling parameter Ψ.
