Abstract
In this work, we develop a position-based finite element formulation for elasto-plastic solids under contact situation. The proposed positional formulation employs a total Lagrangian description and naturally considers geometric nonlinearities. The employed elasto-plastic model is derived from the dissipation inequality, using the thermodynamic conjugacy between the plastic strain rate and the so-called Mandel stress. The formulation is based on the Kröner–Lee decomposition, in which the deformation gradient is multiplicatively split into its elastic and plastic parts. We apply the backward Euler method to solve the plastic evolutions and von Mises yield criterion to define the elastic limit. The adopted kinematic hardening model is a finite strain generalization of the Armstrong–Frederick law, which uses the objective Jaumann derivative for the evolution equation and the concept of back stress tensor as an internal variable. For the elastic parcel of strains, we adopt a neo-Hookean constitutive law. With respect to the 2D application, plane strain and plane stress approximations are considered, where the latter is solved numerically by a local Newton–Raphson numerical procedure. Regarding the contact problem, a classical node-to-segment algorithm is applied, considering both frictionless and frictional cases, with the introduction of Lagrange multipliers in order to enforce contact constraints. Representative numerical examples are used to validate and show the possibilities of the proposed formulation in macroscale simulation of metal cold forming manufacturing processes.
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Acknowledgements
The authors would like to acknowledge the Brazilian agency National Council for Scientific and Technological Development (CNPq), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and the São Paulo Research Foundation (FAPESP) for the financial support given to this research.
Funding
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES)—finance code 001, by Brazilian National Council for Research and Technological Development (CNPq)—Grants 310482/2016-0 and by São Paulo Research Foundation (FAPESP)—Process Number 2018/23957-2.
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Carvalho, P.R.P., Coda, H.B. & Sanches, R.A.K. Positional finite element formulation for two-dimensional analysis of elasto-plastic solids with contact applied to cold forming processes simulation. J Braz. Soc. Mech. Sci. Eng. 42, 245 (2020). https://doi.org/10.1007/s40430-020-02344-z
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DOI: https://doi.org/10.1007/s40430-020-02344-z