Analysis of hot strip rolling using exponent velocity field and MY criterion

Liu, Yuanming; Ma, Guojun; Zhao, Dewen; Zhang, Dianhua

doi:10.1016/j.ijmecsci.2015.04.017

Cited by 15 publications

(10 citation statements)

References 22 publications

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“…To facilitate the calculation, the authors pan the ordinate origin o along y-axis to o ′ where y = b 2 and suppose the dog-bone extending velocity v z along y-axis by exponential function [19] as follows:…”

Section: Velocity Fieldmentioning

confidence: 99%

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A novel approach for the edge rolling force and dog-bone shape by combination of slip-line and exponent velocity field

Zhang

Ling

et al. 2020

SN Appl. Sci.

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This study presents a new mathematical model for edge rolling force and dog-bone shape using the combination of slip-line and exponent velocity field. The slip-line field of the dog-bone area is drawn out based on the deformation characteristics of edge rolling and the maximal depth of dog-bone zone is determined. Then a new exponent velocity field and corresponding strain rate field which satisfy kinematically admissible condition are proposed to analyze the edge rolling force based on upper bound approach. The upper bound solutions of dog-bone shape and rolling force are obtained by minimizing the total power which contains the internal plastic power, frictional and shear powers. The effects of reduction rate, initial thickness and roll radius on dog-bone shape size and edge rolling force are discussed. The results obtained by the combined solution in this paper are compared with measured data in strip hot rolling field and finite element method (FEM) simulation results, and a good agreement is found. Keywords Combined solution of edge rolling force • Slip-line field • Dog-bone shape • Exponent velocity field • Upper bound approach • FEM

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Section: Velocity Fieldmentioning

confidence: 99%

“…Then the minimum of total power functional J * min is obtained by substituting the optimal value of c into Eq. (19).…”

Section: Total Power and Its Minimizationmentioning

confidence: 99%

A novel approach for the edge rolling force and dog-bone shape by combination of slip-line and exponent velocity field

Zhang

Ling

et al. 2020

SN Appl. Sci.

Self Cite

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“…e results show that the model has good prediction accuracy and can be used to predict the rolling force and rolling torque of hot strip rolling. By using the mean yield criterion, Liu et al [27] established a rolling model with high accuracy, and the influence of other factors such as friction factor, reduction, and shape factor on the prediction of rolling force and rolling torque also be discussed. Using the equal area yield criterion, Wen et al [28] established a rolling model based on a parabolic velocity field.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Rolling Force for Extra-Thick Plate with CA Criterion

Zhang

Deng

2020

Mathematical Problems in Engineering

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In order to solve the nonlinear integral difficulty of the Mises yield criterion, a linear yield criterion, called the collaborative approximation (CA) yield criterion, is proposed by the collaborative control method. According to the approximation method, the mathematical expression of the CA yield criterion is derived as a linear function of the three principal stresses. The theoretical results based on the yield criterion in the form of the Lode parameter are verified with the classical test data, and a good agreement is found. Meanwhile, for the purpose of proving the effectiveness of the yield criterion, its specific plastic power is derived and applied to establish the rolling force model of an extra-thick plate. In the modeling, the internal power of plastic deformation is obtained by using the derived specific plastic power, while the shear power dissipation and the frictional power dissipation are obtained by using the methods of strain vector inner product and average velocity integration. Then, the analytical solution of the rolling force is obtained and then extended to the one accounting for the temperature rise. The maximum errors of the predicted rolling torque and rolling force without considering the temperature rise are 12.72% and 11.78%, respectively, while those considering the temperature rise decrease to 3.54% and 5.23%, respectively. Moreover, the influence of relative reduction, friction factor, surface temperature, and the temperature rise of the workpiece on the theoretical results is discussed.

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“…Thus, a better understanding and prediction of viscoplastic deformation, in particular during recrystallisation, is a key issue for an accurate control of product dimensions in a number of hot forming-related processes. Typical loading conditions, especially between the first two stands of a hot strip finishing mill, can be considered as (e.g., [8][9][10][11][12][13]):…”

Section: Introductionmentioning

confidence: 99%

Recrystallisation-assisted creep of an austenitic Fe-Ni alloy under low stresses after hot deformation

et al. 2018

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Static and meta-dynamic recrystallisation are known to take place in some steels under low tensile stresses during thermo-mechanical processes, e.g. between rolling stands in a hot strip finishing mill. The main objective of the present work is to understand the mechanisms responsible for the recrystallisation-assisted visco-plastic deformation in a hot worked iron-nickel austenitic alloy subjected to low stress levels at high temperatures. To that purpose, the recrystallisation kinetics of the alloy was first quantified from stress relaxation, interrupted creep and double-hit compression tests, followed by a microstructural study. The evolutions of strain both in the recrystallising and in the fully recrystallised microstructures were quantified. One of the most original aspects of this work is the experimental verification that the acceleration of the viscoplastic deformation of a recrystallising material is unequivocally and intrinsically associated with the ongoing recrystallisation phenomenon itself. For the austenitic alloy of interest, the most important contribution to this deformation enhancement was found to arise from the deformation of newly recrystallised grains in the primary creep regime. Finally, it is also shown that this recrystallisation-assisted deformation can be qualitatively predicted with acceptable accuracy using a relatively simple, physics-inspired constitutive model.

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Analysis of hot strip rolling using exponent velocity field and MY criterion

Cited by 15 publications

References 22 publications

A novel approach for the edge rolling force and dog-bone shape by combination of slip-line and exponent velocity field

A novel approach for the edge rolling force and dog-bone shape by combination of slip-line and exponent velocity field

Analysis of Rolling Force for Extra-Thick Plate with CA Criterion

Recrystallisation-assisted creep of an austenitic Fe-Ni alloy under low stresses after hot deformation

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