A coupled analysis of viscoplastic deformation and heat transfer—II

Rebelo, Nuno; Kobayashi, Shirô

doi:10.1016/0020-7403(80)90073-9

Cited by 92 publications

(34 citation statements)

References 7 publications

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“…Details regarding the solution of the system of equations can be found in several references, e.g. in the pioneering work of Rebelo and Kobayashi [14,15], which requires the utilization of the following time-stepping scheme, where θ is a parameter varying between 0 and 1. A value of θ = 0.…”

Section: Thermal Modelmentioning

confidence: 99%

“…Direct coupled thermo-mechanical finite element algorithms were further developed by Rebelo and Kobayashi [14,15] to allow the numerical simulation of non-steady-state metal forming processes. The technique was applied to solid cylinder and ring compression testing.…”

Section: State-of-the-artmentioning

confidence: 99%

“…The transient heat diffusion equation (3.2.2.4), was firstly implemented by Rebelo and Kobayashi [14,15] in a finite element computer program for modeling thermo-mechanical metal forming processes, and subsequently implemented by Zhang et al [22] for modeling the heat developed by Joule heating in resistance welding.…”

Section: Heat Transfermentioning

confidence: 99%

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Coupled Finite Element Flow Formulation

Nielsen

Zhang²,

Alves

et al. 2012

SpringerBriefs in Applied Sciences and Technology

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Section: Thermal Modelmentioning

confidence: 99%

Section: State-of-the-artmentioning

confidence: 99%

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Coupled Finite Element Flow Formulation

Nielsen

Zhang²,

Alves

et al. 2012

SpringerBriefs in Applied Sciences and Technology

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“…Some models are defined from the thermodynamics of deformation using internal state variables [22][23][24] and others are establish from the concepts of irreversible thermodynamics [25][26][27][28].…”

Section: Thermal Effect Of Plastic Deformationmentioning

confidence: 99%

Modelling the effect of strain rate on the thermomechanical behaviour of AISI 304 stainless steel

Andrade‐Campos

Teixeira-Dias

Grácio

2005

Mat.-wiss. u. Werkstofftech.

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The present work deals with the interdependences between the strain rate and the strain hardening on stainless austenitic steels. Uniaxial tension tests were conducted on a 304 stainless steel at different strain rates in order to analyse the influence of this parameter on the strain hardening and on the material formability. For the strain rates levels analysed (10 -4 to 10 -1 s -1 ) it was also observed that increasing the strain rate from 10 -4 up to 10 -1 s -1 leads to a 25 % difference in uniform tension elongation revealing the curve-crossing phenomenon. Namely, strain rates equal or higher than 10 -2 lead to a stagnation of strain hardening after a tensile strain of about 0.2. In order to investigate the results obtained, microstructural and thermal analyses were conducted and numerical simulations were performed. It was observed that the decreasing of formability of the material is essentially due to thermal aspects. In the discussion, the experimental and numerical results are analysed in terms of thermal softening, phase transformation and strain rate sensibility.

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“…The analysis of the velocity field is treated by the same constitutive equations as used for the rigid-viscoplastic materials, and the analysis of the temperature field is obtained by solving the heat balance equation at the corresponding state of deformation. The coupling procedure between the two fields is done by the idea -"The Coupled Analysis of Rigid-Thermoviscoplasticity" -developed in 1979 [74,75] An actual application of the finite element technique to metal-forming problems started in the early 70's with several simple examples such as axisymmetric upsetting of a cylinder, and plane-strain side-pressing [45,49]. Also it was applied to stretching sheet metal [41].…”

Section: Concept Of the Finite Element Methodsmentioning

confidence: 99%

Investigations Into Continuous Extrusion

Lengyel

Gerginov

1990

Proceedings of the Twenty-Eighth International

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Continuous extrusion is an important recent development in the production of long lengths of rod and wire. In the process the normally round or rectangular feedstock is forced by friction towards the die by the feed channel, where three distinct regions, the primary, transitional and tertiary zones must develop before extrusion can commence.Stresses and strains in the deforming material along the feed channel, together with the characteristic dimensions of these regions must be known before continuous extrusion machines and tooling can be designed with confidence and product properties predicted.A finite element computer program with quadrilateral two dimensional elements was used to calculate the various parameters in this non-steady state problem, when the development and spread of the transitional region in the billet must be predicted. The program is based on the assumption of rigid-plastic material behaviour and penalty function flow formulation was chosen. This is presented in the thesis in detail, together with other possible formulations and the advantages of the selected method are outlined.For the experiments an existing rig was redesigned and rebuilt to suit the particular task. Two subsequent operations were carried out: first the billet was laterally compressed to provide an initial grip on the material when the primary zone developed, followed by axial compression leading to the development of the transitional and tertiary zones, which are of main interest in the present work. The various parameters were recorded by an IBM microcomputer and Labmaster analogue to digital convertor.Experimental results were compared with theoretical findings obtained under the same conditions as in the experiments and suitability of the developed computer code assessed. Further, various parameters influencing the continuous extrusion processes Context, Linex and Conform were numerically assessed and conclusions drawn. The thesis concludes with suggestions for extending the theoretical model to predict the temperature distribution developed during the deformation process, together with possible implementation of a three dimensional model of the processes under consideration. ACKNOWLEDGEMENTS

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A coupled analysis of viscoplastic deformation and heat transfer—II

Cited by 92 publications

References 7 publications

Coupled Finite Element Flow Formulation

Coupled Finite Element Flow Formulation

Modelling the effect of strain rate on the thermomechanical behaviour of AISI 304 stainless steel

Investigations Into Continuous Extrusion

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