Pure bending of a beam with rectangular cross section is considered. Deformation is realized under the control of bending moment or curvature. The diagram with the descending branch characterizes material properties. The criteria of deformation stability loss are formulated. An opportunity of strain localization is discussed.

V.V. Struzhanov  Deformation stability of plastic beam under pure bending // Физ. мезомех. - 2004. - Т. 7. - № Спец1. - С. 169-172