Elasto-plastic response of orthotropic pipes under bending, pressure and axial force

An elasto-plastic analysis of circular thin-walled pipes in the non-buckled configuration subjected to bending moment, pressure and axial loads is presented. Plastic stress-strain relationships based on Drucker's postulates, Hill's yield criterion and the deformation theory are utilized. The analysis includes orthotropic behaviour with the assumption of a linear strain-hardening material. Results are presented for both isotropic and orthotropic materials.