Cross bend, round and ring plates, разносопротивляющиеся limit state, plastic materials, the plasticity condition, law of the plastic current bending moments, curvature speeds.

Limit condition of round and ring plates from разносопротивляющихся materials is considered on the basis of a condition P. Balandin’s plasticity. Are used entered and described piecewise and linear approximations of an ellipse of tension of Balangding and on them to basis for the generalized characteristics (the moments and speeds кривизн) laws of axisymmetric deformation round and ring are received plates at an axisymmetric cross bend.

Nemirovsky Yuri Vladimirovich e-mail: nemirov@itam.nsc.ru, Dr. Sci. Phys. & Math., Professor, Institute of Theoretical and Applied Mechanics S.A.Christianovich Siberian Branch of the Russian Academy of Sciences, Novosibirsk State Technical University, Novosibirsk, Russia.