The decay of stresses induced by flat rolling of metal strip

Domanti, S.; McElwain, D. L. S.; Middleton, Richard H.; Edwards, W.J.

doi:10.1016/0020-7403(93)90028-s

Cited by 10 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alternative approaches [4][5][6] attempted to consider this non-uniform velocity distribution and the corresponding stress distribution in the transient zone, for the prediction of final strip flatness. Shear stress components within the strip in the transient zone (roll bite exit) are sometimes neglected.…”

Section: Strip Flatness and Buckling Modelling In Cold Rollingmentioning

confidence: 99%

Strip flatness modelling including buckling phenomena during thin strip cold rolling

Abdelkhalek

Montmitonnet

Potier‐Ferry

et al. 2010

Ironmaking & Steelmaking

View full text Add to dashboard Cite

International audienceThis paper describes the application of a steady state elastic-viscoplastic finite element model to the prediction of strip flatness and out of bite buckling during cold rolling of thin strips. This model is applied here to the last stand of a tinplate tandem cold mill. Results show that strip buckling reshuffles the non-homogeneous strip velocity profile just at the roll bite exit; strip stresses inside the roll bite are little impacted, so that roll stack deformation and roll force profile are not modified. The paper focuses on 'latent strip flatness', i.e. the profile in the transverse direction of the stress in the rolling direction. The profile predicted by the model far downstream the roll bite is in good agreement with shapemeter measurements only if strip buckling (i.e. manifest flatness) just at the roll bite exit and its interaction with the roll bite are considered, using a strong coupling of bite model and post-bite buckling model

show abstract

Section: Strip Flatness and Buckling Modelling In Cold Rollingmentioning

confidence: 99%

Strip flatness modelling including buckling phenomena during thin strip cold rolling

Abdelkhalek

Montmitonnet

Potier‐Ferry

et al. 2010

Ironmaking & Steelmaking

View full text Add to dashboard Cite

show abstract

“…The coupling relationship between longitudinal stress, transverse stress, and longitudinal velocity can be derived from the elastic constitutive law. If the plastic flow terms in Equation ( 20) are neglected, andv x is approximated by v dn (the uniform velocity at the downstream boundary), this equation can be integrated along the rolling direction from the roll bite exit (subscript 'out') to the downstream interstand steady region (subscript 'dn'), as proposed by Domanti et al [19], giving…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the system of multi-stand rolling, which is too large to be solved as a whole, can be decoupled. The classic Saint Venant's principle suggests the decay length is of the order of the strip width, and Domanti et al [19] agreed based on their analytical solution.…”

mentioning

confidence: 94%

“…Nevertheless, only longitudinal stress may occur in these ribbon models, neglecting transverse stress and shear stress. Domanti et al [19] derived a purely elastic plane stress formulation for a moving strip in the interstand and found an analytical solution for the stress decay with assumed boundary conditions. If coupled with a roll bite model, this model has the potential to predict the residual stress evolution under elastic recovery.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Finite Difference Modeling of the Interstand Evolutions of Profile and Residual Stress during Hot Strip Rolling

Yao

Shao

et al. 2020

Metals

View full text Add to dashboard Cite

Elastic recovery and viscoplastic stress relaxation occur in the interstand of hot rolling, impacting the evolutions of strip profile and residual stress, which are major concerns for obtaining high-quality flat products. A better understanding of the evolutionary mechanisms would help develop shape control strategies. Therefore, a quasi-3D steady-state elasto-viscoplastic rolling model is developed based on the finite difference method. Predictions of spread, profile, and residual stress are validated through comparisons with a two-stand finite element model. The new model is also complemented with a roll stack model and with a viscoplastic constitutive model calibrated by hot compression tests to simulate a seven-stand hot rolling industrial experiment with low carbon steel. Comparisons between the predicted and measured profiles show a satisfactory accuracy. The simulation costs approximately a minute of CPU time, enabling the new model to run massive parametric campaigns for process optimization. It is found that during the interstand elastic recovery, the transverse compressive stress releases and the strip velocity tends to be uniform, revealing residual stress after a significant change of stress pattern. The stress relaxation mainly occurs at the edge near the roll bite and therefore increases the edge drop of the profile; it also decreases the center crown by changing the distribution of the rolling pressure in the roll bite.

show abstract

“…11, after leaving the plate from the roll gap, the longitudinal stress distribution changes so that gradually the amount of tensile stress is reduced at the edge of plate and is replaced with compressive stress, while at the middle of plate the compressive stress is changed to tensile. In research work by Domanti and McElwin,16) it is stated that stress changes after leaving from the roll gap is attributed to non-uniform exit velocity distribution along the width. However, the stress variations obtained in this analysis are higher than the results by Domanti and McElwin and cannot be considered as the main factor affecting the stress changes.…”

Section: Deformations After Leaving the Roll Gapmentioning

confidence: 99%

Investigations on Formation of Shape Defects in Square Rolling of Uniform Thin Flat Sheet Product

Moazeni

Salimi

2013

ISIJ Int.

View full text Add to dashboard Cite

In rolling of wide strip, longitudinal compressive stresses develop as a result of non-uniform deformation along the plate width, which enhance long-shape wave. Different reduction as a result of uneven geometrical factor along the plate width considered as a main cause of such non-uniform deformation in flat rolling. In order to investigate the non-uniformity of deformation that take place in width direction as a cause of non-geometrical factors, a 3D model of flat rolling process employing ABAQUS software, which includes the buckling features is created. It is realized that in addition to uneven geometrical factor which influence the plate quality, the variation of forming condition along the width as a result of different boundary condition also lead to heterogeneity of the material flow in the roll gap and cause to non-uniform distribution of longitudinal stress. In addition to non-uniform flow of material along the plate width, different transversal flow of material along the plate edge in the roll gap will change the distribution of longitudinal stress after rolling. Despite the fact that variation in residual stresses is calculated to be very low but it is shown that even low values of the residual stresses plays an important role in buckling of thin flat rolled products.

show abstract

The decay of stresses induced by flat rolling of metal strip

Cited by 10 publications

References 3 publications

Strip flatness modelling including buckling phenomena during thin strip cold rolling

Strip flatness modelling including buckling phenomena during thin strip cold rolling

Finite Difference Modeling of the Interstand Evolutions of Profile and Residual Stress during Hot Strip Rolling

Investigations on Formation of Shape Defects in Square Rolling of Uniform Thin Flat Sheet Product

Contact Info

Product

Resources

About