A new rigid‐viscoplastic model for simulating thermal strain effects in metal‐forming processes

Dvorkin, Eduardo N.; Toscano, Rita G.

doi:10.1002/nme.833

Cited by 6 publications

(5 citation statements)

References 17 publications

(14 reference statements)

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“…In fact, several authors (Matsumiya et al, 1986;Miyazaki et al, 1981;Nagata et al, 1990;Won et al, 2000;Yamanaka et al, 1995) relate the risk of hot-tearing to the magnitude of these variables. Then, strains (Figure 4) and strain rates ( Figure 5) are calculated for the cases (a), (b), (c) and (d) for a circular cross-section with a diameter of 300 mm and a casting speed of 1 m min -1 , using an in-house finite-elements 3D Eulerian model (Dvorkin and Toscano, 2003) with constant viscosity. The boundary conditions fix the bar location at the straightening points but allow it to take any position between them.…”

Section: Traditional Vs Continuous Straighteningmentioning

confidence: 99%

A continuous straightening formulation based on minimum curvature variation

Poltarak

Ferro

2019

IJMPT

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A continuous straightening formulation is proposed in order to smooth the transition between the curved and straight sectors in a continuous caster of metals. This is accomplished by minimising the curvature variation in the straightening sector, taking into account boundary conditions usually found when designing or modifying continuous casting machines. A differential equation is obtained for the bar trajectory which is numerically solved after discretisation. The obtained algorithm is used to compare different casting configurations whose smoothness is quantified in terms of the strain and strain rate along the bar. The continuous straightening configurations developed by this formulation were found to be smoother than typical setups with 1 or 2 straightening points. It was also found that the longer the straightening length, the smoother the transition.

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Section: Traditional Vs Continuous Straighteningmentioning

confidence: 99%

A continuous straightening formulation based on minimum curvature variation

Poltarak

Ferro

2019

IJMPT

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“…In previous publications we reported the algorithms that we developed for implementing this technique in our computer code METFOR and we also reported several METFOR applications for the analyses of industrial steel forming processes [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The flow formulation [2], implemented via the pseudo-concentrations technique [3,4], has proved to be a very powerful tool for modelling bulk metal forming processes. In previous publications we reported the algorithms that we developed for implementing this technique in our computer code METFOR and we also reported several METFOR applications for the analyses of industrial steel forming processes [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

On the modelling of complex 3D bulk metal forming processes via the pseudo‐concentrations technique. Application to the simulation of the Mannesmann piercing process

Berazategui

Cavaliere

Montelatici³

et al. 2005

Numerical Meth Engineering

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SUMMARYThe modelling of complex 3D metal forming processes using the flow formulation, implemented via the pseudo-concentrations technique, requires the development of robust computational strategies for dealing with the velocity and pseudo-concentration boundary conditions in the zone where the blanktools contact is developed. A new algorithm, designed to fulfil those requirements, is presented in this paper.The Mannesmann piercing process is a metal forming operation used in industry for manufacturing metal seamless pipes. The results of the Mannesmann process finite element simulation are particularly dependent on the accuracy and stability of the algorithm used to describe the contact boundary conditions between the forming tools and the blank. The validation of the finite element model is performed by comparing the numerical predictions obtained using the new algorithm with the results of industrial tests.

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“…Plohr and Sharp presented conservative Eulerian formulations for elastic flow and plasticity in . Dvorkin and colleagues implemented flow formulations using an Eulerian description of motion for analyzing transient and stationary metal forming processes in , while Trangenstein and Colella and Miller and Colella developed shock‐capturing Eulerian numerical methods for general hyperelasticity. In addition to solving the momentum equations, Eulerian formulations require solving additional equations for the transport of either the stress or the deformation gradient.…”

Section: Introductionmentioning

confidence: 99%

A finite strain Eulerian formulation for compressible and nearly incompressible hyperelasticity using high‐order B‐spline finite elements

Duddu

Lavier

Hughes

et al. 2011

Numerical Meth Engineering

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SUMMARYWe present a numerical formulation aimed at modeling the nonlinear response of elastic materials using large deformation continuum mechanics in three dimensions. This finite element formulation is based on the Eulerian description of motion and the transport of the deformation gradient. When modeling a nearly incompressible solid, the transport of the deformation gradient is decomposed into its isochoric part and the Jacobian determinant as independent fields. A homogeneous isotropic hyperelastic solid is assumed and B-splines-based finite elements are used for the spatial discretization. A variational multiscale residual-based approach is employed to stabilize the transport equations. The performance of the scheme is explored for both compressible and nearly incompressible applications. The numerical results are in good agreement with theory illustrating the viability of the computational scheme.

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A new rigid‐viscoplastic model for simulating thermal strain effects in metal‐forming processes

Cited by 6 publications

References 17 publications

A continuous straightening formulation based on minimum curvature variation

A continuous straightening formulation based on minimum curvature variation

On the modelling of complex 3D bulk metal forming processes via the pseudo‐concentrations technique. Application to the simulation of the Mannesmann piercing process

A finite strain Eulerian formulation for compressible and nearly incompressible hyperelasticity using high‐order B‐spline finite elements

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