An upper bound analysis for reshaping thick tubes to polygonal cross-section tubes through multistage roll forming process

Farahmand, Hamid; Abrinia, Karen

doi:10.1016/j.ijmecsci.2015.06.012

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…(6) and (8). Let n be the unit normal vector to the velocity discontinuity line and φ be the angle between the tangent to this line and the r-axis, measured from the axis anti-clockwise (Fig.…”

Section: Kinematically Admissible Velocity Fieldmentioning

confidence: 99%

“…The kinematically admissible velocity field is obtained by putting f(ζ) = − 1/(2h) in Eq. (8). Then, g(ζ) = 0.…”

Section: Illustrative Examplementioning

confidence: 99%

“…Until now, the upper bound theorem has been considered as a powerful tool for finding appropriate velocity fields and evaluating the force required to deform workpieces for this model (see, for example, very recent publications [1][2][3][4][5][6][7][8]). In utilizing the upper bound method, the velocity fields are typically approximated by a class of assumed functions.…”

Section: Introductionmentioning

confidence: 99%

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A general kinematically admissible velocity field for axisymmetric forging and its application to hollow disk forging

Alexandrov

Lyamina

Jeng

2016

Int J Adv Manuf Technol

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An approach for selecting general kinematically admissible velocity fields for axisymmetric forging problems is outlined. The approach accounts for the existence of a rigid zone at frictional interfaces and for the singular behavior of real velocity fields in the vicinity of maximum friction surfaces. The plastic work rate for a material obeying the von Mises yield criterion and its associated flow rule is expressed in terms of one arbitrary function of a single argument, its derivative, and anti-derivative. An upper bound solution for constrained forging is given. Comparison with an available upper bound solution is made and it is shown that the new kinematically admissible velocity field results in a more accurate solution at high friction. Other problems that can be treated are briefly discussed.

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Section: Kinematically Admissible Velocity Fieldmentioning

confidence: 99%

“…The kinematically admissible velocity field is obtained by putting f(ζ) = − 1/(2h) in Eq. (8). Then, g(ζ) = 0.…”

Section: Illustrative Examplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A general kinematically admissible velocity field for axisymmetric forging and its application to hollow disk forging

Alexandrov

Lyamina

Jeng

2016

Int J Adv Manuf Technol

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“…The influence of several effective parameters such as roll radius and speed, roll gap reduction value and initial pipe size; on the rolled square tube were investigated. In another study, 18 they generalized this method for the multistage forming process to produce polygonal cross-sectional thick single-layer tubes by means of a roll forming rig with flat rolls. Bayoumi and Attia 19 analyzed the plastic forming of a circular tube into a square one through four idle flat rolls to determine drawing force and the tool load using experimental observations, analytical expressions and the ﬁnite element simulation.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of bonding strength in shape rolling of Al–Cu bimetallic circular pipes into square tubes

Tajyar

Masoumi

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present research, the intermetallic layer situation and bond strength of square tubes produced by shape rolling of Al–Cu bimetallic pipes has been investigated. The explosive welding process was used for the production of bimetallic circular pipes. The macro- and microscopic features of explosive-welded pipes and shape-rolled specimens at various stages were experimentally measured by using shear and hardness testing and optical metallography. Moreover, scanning electron microscopy was used for fractography of the fracture surfaces after the last stage of forming. The experimental results showed that the shear strength variation is dependent on the intermetallic layer thickness and its continuity. Also, continuity in Al–Cu interfaces that have a thick intermetallic layer intensifies the microcrack propagation, while due to discontinuity in the thin intermetallic layer, the retardation of catastrophic crack propagation was observed in the early passes of the shape-rolling process. However, the results of the present study showed that as the passes proceed in the rolling process, the crack propagation phenomenon, which is the cause of a decrease in shear strength, is expected.

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Effect of cold process drawing parameters on the formability and microstructure of ribbed cladding tubes

Liu,

Yang,

et al. 2024

Int J Adv Manuf Technol

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An upper bound analysis for reshaping thick tubes to polygonal cross-section tubes through multistage roll forming process

Cited by 9 publications

References 6 publications

A general kinematically admissible velocity field for axisymmetric forging and its application to hollow disk forging

A general kinematically admissible velocity field for axisymmetric forging and its application to hollow disk forging

Experimental analysis of bonding strength in shape rolling of Al–Cu bimetallic circular pipes into square tubes

Effect of cold process drawing parameters on the formability and microstructure of ribbed cladding tubes

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