Abstract: | We propose a direct proof of the identity of the concepts of slippage and the Koiter version of the theory of plasticity based on parallel translation of planes enveloping the Tresk viscosity surface. One figure. Bibliography: 5 titles.Translated fromMatematicheskie Metody i Fiziko-Mekhanicheskie Polya, Issue 30, 1989, pp. 55–57. |