Thermal analysis of hot strip rolling using finite element and upper bound methods

Sadrnia, Hassan

doi:10.1016/j.apm.2008.05.022

Cited by 25 publications

(9 citation statements)

References 13 publications

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“…Knowledge of the texture and anisotropy is important since it influences the macroscopic deformation behavior such as formability. A more sophisticated material law could be used as an input in various numerical and analytical approaches such as the finite element (FE) based simulations, [2] the slab method, [3] the slip-line method [4] and the upper bound method, [5][6][7] to calculate various technological outputs of the rolling process.…”

Section: Introductionmentioning

confidence: 99%

A New Analytical Approach for the Velocity Field in Rolling Processes and Its Application in Through-Thickness Texture Prediction

Decroos

Sidor

Seefeldt

2013

Metall Mater Trans A

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A new analytical model is presented that expresses kinematically admissible velocity fields in rolling processes. Opposed to conventional streamline approaches, the current model does not force the material to flow along the prescribed lines, but introduces a new coordinate that is constant over these lines, to prescribe a fixed component of the velocity in the rolling direction as a function of that coordinate and the coordinate along the rolling direction. The interaction between the rolls and the surface is incorporated in the model via two scalar parameters which depend on the friction conditions between the roll and the sheet, and the properties of rolled material. The scalar parameters can be tuned with experimental observations of deformation flow across the thickness. The modelled material flow does not reveal significant deviation from the one calculated by streamlines. The obtained analytical expressions for the velocity gradient tensor components combined with polycrystal plasticity models enables the prediction of the through-thickness texture evolution for various friction conditions.

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Section: Introductionmentioning

confidence: 99%

A New Analytical Approach for the Velocity Field in Rolling Processes and Its Application in Through-Thickness Texture Prediction

Decroos

Sidor

Seefeldt

2013

Metall Mater Trans A

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“…27 Such conditions usually exist in high-speed metal forming operations such as high-speed rolling. 28 To ensure that a stable solution is achieved, the SUPG approach was considered in the present work. Accordingly, to solve equation (10), weak form statement of equation (10) was developed using the weighted residual technique 22 as…”

Section: Model Explanationmentioning

confidence: 99%

Finite element modeling of thermal and mechanical stresses in work-rolls of warm strip rolling process

Koohbor

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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An integrated mathematical model was developed to study the thermo-mechanical behavior of strips and work-rolls during warm rolling process of steels. A two-dimensional finite element analysis was first employed to solve for the thermomechanical response of the rolled strip under steady-state conditions. The calculated roll pressure and temperature fields were then used to apply proper boundary conditions for solving the governing thermo-mechanical problem for the work-roll. The obtained results indicate that in warm strip rolling of steels, the thermal and mechanical stresses developed within the work-roll are comparable; however, the more significant influence is due to heating and cooling of the work-roll during the process, particularly in case of warm rolling operations of the strips with higher initial temperature. Besides, the utilized model was shown to be capable of determining the effects of various rolling parameters on the thermo-mechanical behavior of strips and work-rolls during warm rolling process.

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“…Contact with hot surfaces and often water coolant applied from the side on the dies expose the die to harsh environments [3]. In addition, metallurgical transformations contribute to temperature changes [4]. There are plenty of controversial models presented in the literature.…”

Section: Introductionmentioning

confidence: 99%

Modeling Thermomechanical Stress with H13 Tool Steel Material Response for Rolling Die under Hot Milling

Tolcha

Lemu

2019

Metals

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For the extreme pressure and temperature arising in the hot rolling process, thermomechanical (TM) models are used to predict the residual stresses on the surface of the die because a quantification of the TM stresses allows a prediction of the life span of the rolling die. As the accuracy and consistency of models developed in this area show a large variation due to the considered parameters, conditions, and assumptions, the capability of the developed models needs to be verified for a particular set of circumstances. In this study, new constitutive equations are proposed and a model consisting of five sub-models that computes temperature distribution, thermal stresses, mechanical stresses, and thermomechanical stress for the rolling die under continuous casting application has been developed and presented in this paper. The first sub-model describes the temperature distribution on the rolling die surface by accounting for the effects of different process parameters such as the initial temperature of the slab, reduction ratio, and the rolling speed, while the second and the third sub-models describe the thermal cyclic stress and the elasticity deformation of mechanical stress, respectively. Furthermore, the fourth sub-model describes the TM stress generation through inheriting numerical approaches, and the last sub-model is developed for the H13 tool material response at a high temperature. To verify the developed analytical models, a finite element simulation and the experimental data are considered. The analytical models are computed using Python, and the ABAQUS software has been used for the finite element simulations. The results show a good agreement with the finite element simulation and experimental data.

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Thermal analysis of hot strip rolling using finite element and upper bound methods

Cited by 25 publications

References 13 publications

A New Analytical Approach for the Velocity Field in Rolling Processes and Its Application in Through-Thickness Texture Prediction

A New Analytical Approach for the Velocity Field in Rolling Processes and Its Application in Through-Thickness Texture Prediction

Finite element modeling of thermal and mechanical stresses in work-rolls of warm strip rolling process

Modeling Thermomechanical Stress with H13 Tool Steel Material Response for Rolling Die under Hot Milling

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