Stability of the von Mises truss after the loss of material ellipticity

The process of buckling of the von Mises truss in the case of material instability, i.e., with allowance for the loss of ellipticity, is considered. Strain diagrams are constructed. Results that allow one to study buckling of thin-walled structures (arcs or shells) made of materials for which the loss of ellipticity of equilibrium equations is possible are obtained.