Analysis of the Nonlinear Large Deformation Behavior of Composite Cylindrical Shells.

摘要

The governing equations for the nonlinear analysis of imperfect, stiffened, laminated, circular, cylindrical, thin shells, subjected to uniform axial compression and torsion, and supported in various ways, are derived and presented. Two types of formulations have been developed; one (w,F-Formulation) is based Donnell-type nonlinear kinematic relations; and the other (u, v, w - formulation) is based on Sanders' -type of nonlinear kinematic relations (small strains, moderate rotations about in-plane axes). A solution methodology is developed and presented. Numerical results are generated for certain special geometries, and these serve as bench marks for the solution scheme. Parametric studies are performed for composite cylinders. The scope of these studies is to assess the effect of geometric imperfections lamina stacking, and length of radius ratio. The solution scheme is also tested by comparing theoretical predictions (critical loads based on the developed methodology) to experimentally obtained results.