Post-Buckling Behavior of Laminated Composite Cylindrical Shells Subjected to Axial, Bending and Torsion Loads

Abstract

In present work, post-buckling behavior of imperfect (of eigen form) laminated composite cylindrical shells with different L/D and R/t ratios subjected to axial, bending and torsion loads has been investigated by using an equilibrium path approach in the finite element analysis. The Newton-Raphson approach as well as the arc-length approach is used to ensure the correctness of the equilibrium paths up to the limit point load. Post-buckling behavior of imperfect cylindrical shells with different L/D and R/t ratios of interest is obtained and the theoretical knock-down factors are reported for the considered cylindrical shells.

Experimental Research and Method for Calculation of 'Upsetting-with-Buckling' Load at the Impression-Free (Dieless) Preforming of Workpiece

“…The studies on the longitudinal compression of beam beyond the elastic limit indicate an increase in the value of the load to the point of the local transition of the rod to the plastic state [24][25][26]. Further upsetting can be characterized by a general unloading due to an increase in the bending moment arm, which is associated, for example, with the difficulty of obtaining an increasing characteristic of ring fuses with longitudinal slots.…”