A Study of Short Cylindrical Shells with and without Cutouts under Pure Bending

摘要

In this report, short cylindrical shells are studied under pure bending. An edge kinematic constraint loading method is adapted for use with the STAGSC computer code. With it, short unstiffened cylindrical shells are studied for prebuckling displacements and compared with axially stressed cylinders. End rings are added to note their influence. The bending is applied to short internally stiffened (smeared stringer theory) cylinders with the resulting buckling values and patterns contrasted against axial loading. The L/R range of interest is from .698 to 1.361. Symmetrical and unsymmetrical 12 inch cuts are added to the stiffened cylinder to study the resulting affects from this imperfection. The results indicate. (a) For short length (L/R < or = 10) cylinders, end loading by bending rotation causes structural deformation patterns different than long cylinder bending deflections. (b) The imposed boundary effect for unstiffened cylinders diminishes with L/R increase until L/R = 20 where there is no noticable deformation influence. (c) End ring stiffeners studied did not alter the basic short cylinder deformation patterns. (d) Compressive zone buckling failure under bending can be modeled through axial compression analysis. (Author)