Influence of strain hardening on bending moment-axial force interaction

This article derives bending moment-axial force (M-P) interaction curves for mild steel by considering elastic-plastic and strain hardening idealisations with linear and parabolic strain hardening characteristics. The interaction relations can predict strains, which is not possible in a rigid, perfectly plastic idealisation. The parameters required are obtained from a standard uniaxial tension test and the procedure can be used for many other materials.