A steady state thermo-elastoviscoplastic finite element model of rolling with coupled thermo-elastic roll deformation

Hacquin, A.; Montmitonnet, Pierre; Guillerault, J.-P.

doi:10.1016/0924-0136(96)02315-1

Cited by 44 publications

(40 citation statements)

References 6 publications

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“…Thus, convergence issues of any transient behaviour are avoided, making the steadystate formulation more precise and less demanding in terms of calculation time (see also Hacquin et al (1996) for a similar approach). Moreover, the modeling approach directly accommodates elastic-plastic unloading, and can be adapted to a wide range of constitutive models.…”

Section: Steady-state Formulationmentioning

confidence: 99%

Rolling induced size effects in elastic–viscoplastic sheet metals

Nielsen

2015

European Journal of Mechanics - A/Solids

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Rolling processes for which the characteristic length scale reaches into the range where size effects become important are receiving increased interest. In particularly, this is owed to the roll-molding process under development for high-throughput of micronscale surface features. The study presented revolves around the rolling induced effect of visco-plasticity (ranging hot and cold rolling) in combination with strain gradient hardening -including both dissipative and energetic contributions. To bring out first order effects on rolling at small scale, the modeling efforts are limited to flat sheet rolling, where a non-homogeneous material deformation takes place between the rollers.Large strain gradients develop where the rollers first come in contact with the sheet, and a higher order plasticity model is employed to illustrate their influence at small scales. The study reveals that the energetic length parameter has negligible effect on the rolling quantities of interest, while the contribution coming from the dissipative length parameter can be dominant. Considering a slow and a fast moving sheet, respectively, convergence towards the rate independent limit is demonstrated, and a characteristic velocity is identified, for which the torque and punch force applied to the roller becomes independent of the material rate-sensitivity. *

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Section: Steady-state Formulationmentioning

confidence: 99%

Rolling induced size effects in elastic–viscoplastic sheet metals

Nielsen

2015

European Journal of Mechanics - A/Solids

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“…An in-situ instrumentation of the rolling mill is not suitable for obtaining the residual stress distribution of the strip directly, easily and accurately, as it depends on several coupled aspects of physics (e.g., elastic-viscoplasticity, tribology, and thermic) (Hacquin et al, 1996;Montmitonnet, 2006;Nakhoul et al, 2014). Indeed, local residual stress distribution along the width (for one abscissa in the rolling direction) may be measured by tensiometer rolls, but the resolution of the sensors in the transverse y-direction is insufficient for a high-stress gradient region (Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical modeling of flatness defects in strip cold rolling

Tran

Tardif

Limam

2015

International Journal of Solids and Structures

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a b s t r a c tThe manufacturing of sheets with high mechanical yield stress, low thickness and minimal flatness defects is a major challenge in the cold rolling of aluminum alloys or steels. Compressive residual stress may appear due to the manufacturing process and induce elastic wave buckling, leading to flatness defects. This study proposes an experimental setup to analyze the interaction between residual stress and buckling for wavy edge flatness defects. The residual stress is simulated by thermal stress. High-resolution full-field measurements are used to measure the wrinkling shape and thermal field. The influence of surface imperfections and global tension on the wrinkling characteristics is highlighted. Finite element tests are used for test validation.

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“…The model used is based on two items: -A 3D implicit FEM software called Lam3, fully described by Hacquin [19,20]. It is used here in its steady state option based on streamlines.…”

Section: Fem-based Modelmentioning

confidence: 99%

Numerical Treatments of Slipping/No-Slip Zones in Cold Rolling of Thin Sheets with Heavy Roll Deformation

2015

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Abstract:In the thin sheet cold rolling manufacturing process, a major issue is roll elastic deformation and its impact on roll load, torque and contact stresses. As in many systems implying mechanical contact under high loading, a central part is under "sticking friction" (no slip) while both extremities do slip to accommodate the material acceleration of the rolled metal sheet. This is a crucial point for modeling of such rolling processes and the numerical treatment of contact and friction ("regularized" or not), of the transition between these zones, does have an impact on the results. Two ways to deal with it are compared (regularization of the stick/slip transition, direct imposition of a no-slip condition) and recommendations are given.

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A steady state thermo-elastoviscoplastic finite element model of rolling with coupled thermo-elastic roll deformation

Cited by 44 publications

References 6 publications

Rolling induced size effects in elastic–viscoplastic sheet metals

Rolling induced size effects in elastic–viscoplastic sheet metals

Experimental and numerical modeling of flatness defects in strip cold rolling

Numerical Treatments of Slipping/No-Slip Zones in Cold Rolling of Thin Sheets with Heavy Roll Deformation

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