On the reducibility of solutions for the generalized yield criterion to solutions for Tresca’s yield criterion under axial symmetry

Author details
  • Ishlinsky Institute for Problems in Mechanics RAS, Moscow, Russian Federation; Samara National Research University, Samara, Russian Federation
  • Moscow Aviation Institute, Moscow, Russian Federation
  • Russian Technological University – MIREA, Moscow, Russian Federation

Abstract

Many continuum mechanics models are reduced to simpler models at certain parameter values. However, solutions for the general model may not converge to the corresponding solu-tions for a simpler model. In the mathematical theory of plasticity, the yield criterion completely determines the material's behavior if the associated plastic flow rule is accepted. In this paper, the reducibility of axisymmetric solutions for the generalized yield criterion to the corresponding solutions for Tresca’s criterion is investigated when the generalized yield condition tends to Tresca’s criterion. It is shown that there is no convergence if the maximum friction law is one of the boundary conditions. In this case, the solutions for both yield criteria are singular. In particu-lar, the quadratic invariant of the strain rate tensor tends to infinity near the friction surface. The strain rate intensity factor controls the magnitude of this invariant in the vicinity of the friction surface. The strain rate intensity factor is involved in some constitutive equations for predicting the evolution of material properties near frictional interfaces in metal forming processes. In this paper, using the solution of a specific boundary value problem, the behavior of this factor is in-vestigated when the generalized yield criterion tends to Tresca’s criterion. It is shown that the strain rate intensity factor continuously changes when the generalized yield criterion deviates from Tresca’s yield criterion. This behavior of the strain rate intensity factor justifies its use in the constitutive equations for the evolution of material properties near friction surfaces.

Keywords

generalized yield criterionmaximum frictionsingularityreducibility.

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Article information

Published
23 June 2023
Issue date
23 June 2023
Issue
No. 2 (2023)
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