Elastic-Plastic Problems of Compressible Straight Bar under Combined Loading Condition

Abstract

Incremental elastic-plastic problems are analysed numerically with respect to a straight bar under combined bending and twisting, and a thin-walled tube under tension or torsion combined with internal pressure. In both problems, the secondary effects are discussed; in the former, the solutions taking into account the secondary stresses which arise from the material compressibility in elastic region are compared with those corresponding to the incompressible material; and in the latter, the influences of the stress and strain distributions along the thickness of a specimen are examined to verify the apparent effects on the experimental yield surface.