Nonlinear Equivalent Plate Modeling of Wing-Box Structures

摘要

A geometrically nonlinear moderate-deformation equivalent plate modeling capability for wing structures is developed. It is a generalization of the simple-polynomial-based equivalent plate modeling techniques for linear wing structures. The formulation allows first-order shear deformation plate theory or classical plate theory to the used for modeling and solid thin plates as well as typical wing-box structures made of cover skins and an array of spars and ribs. Mass and stiffness matrix contributions of different wing-box elements are presented. Stiff springs are included to enforce a variety of boundary conditions.