Analysis of the Effect of Strain Hardening on Central Bursting Defects in Drawing and Extrusion

Zimerman, Z.; Avitzur, B.

doi:10.1115/1.3427698

Cited by 64 publications

(24 citation statements)

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“…Also, under die angle-reduction combinations, a large hydrostatic tension component exists along the wire central axis, which can cause local tensile failure. Zimerman and Avitzur (1970) studied the effect of strain hardening on central bursting defects in drawing and extrusion. Gurney and DePierre (1974) have shown experimentally that the central bursting occurs when low frictional resistant interfaces are employed.…”

Section: Introductionmentioning

confidence: 99%

The influence of the drawing parameters and temperature rise on the prediction of chevron crack formation in wire drawing

2012

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The objective of the present work is to predict the formation of chevron crack in copper wire drawing process. The first part of this paper is to determine the chevron crack formation initiated by a central burst inside the wire material using experimental tests. These results are compared with results from a series of numerical simulations using the CockcroftLatham fracture criterion. The second part of this work concerns the determination of a curve that divides the chevron and safe zones for a better wire drawing process. The conditions of central burst defects formation along the wire axis depend on drawing parameters and friction coefficient between the die and the wire. The friction coefficient is defined as a linear function of temperature rise which is measured close to the wiredie interface. The obtained results show that the friction A. Haddi (B) Laboratoire Génie Civil et géo-Environnement (LGCgE), coefficient depending on temperature rise during wire drawing has an impact on the damage of copper wire.

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Section: Introductionmentioning

confidence: 99%

The influence of the drawing parameters and temperature rise on the prediction of chevron crack formation in wire drawing

2012

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“…Amongst the most basic of these is the well-known shape parameter (Orbegozo, 1968;Wright, 1976Wright, , 1979, which characterises the likelihood of central bursting based on the values of reduction ratio and die angle. Analytical attempts (Avitzur, 1968a,b;Zimmerman and Avitzur, 1970a, b), based on admissible velocity fields, have included the additional influence of friction and strain hardening effects on the likelihood of central bursting formation. Despite giving reasonable predictions, these criteria are quite adventitious, in that they are not concerned with the stress and strain distribution, but only with the energy required.…”

Section: Introductionmentioning

confidence: 99%

Ductile Fracture by Central Bursts in Drawn 2011 Aluminium Wire

McAllen

Phelan

2005

Int J Fract

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This paper reports on the application of numerical techniques to predict the initiation and propagation of central burst defects in the wire drawing process. The development and implementation of a suitable failure model into a commercial finite element code, via a user written subroutine, has enabled the occurrence of ductile fracture by central bursting in 2011 Aluminium alloy wire to be successfully analysed. In validating the numerical model, the drawing force, die pressure and occurrence of central burst defects has been compared with previously published experimental data. Results from the numerical model suggest that a 'nose shape' curve divides the safe and unsafe zones for the successful drawing of the wire. It follows that no central bursts are expected to occur, regardless of the die angle used, when the reduction ratio is less than a critical value. When central bursts did occur, the effective strain was found to vary periodically along the surface of the wire. These oscillations corresponded with the occurrence of central burst defects and resulted in variations in the final diameter of the wire. These variations in the final diameter of the wire are thought to be representative of an external defect known as 'bamboo markings', which are often an external indication of central burst defects within the wire.

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“…Finally, this study confirms the following advice of Rogers (13). The working ranges for the new materials of the body-centered cubic crystal structure must be determined experimentally, even though the principles and general understanding exist, since the brittle transition temperature may not be known for such materials, especially under the some complex stress systems which arise in some deformation processes.…”

Section: Discussionmentioning

confidence: 60%

Penny-shaped Central Bursting Defect in the Cold Drawing of High Chromium Ferritic Stainless Steel

Shimura

1978

Trans. JIM

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The phenomenon of central bursting during cold drawing of a high-purity high-chromium ferritic stainless steel has been investigated, and it is well established that the defect forms periodically in the drawing direction and does not have the usual chevron or arrow shape but a penny shape. The defect is generated by cleavage fracture at the centerline of the billet, depending on the stress state when plastically deformed during drawing. In drawing the hydrostatic stresses are most tensile in the slipline field analysis, and the damage at a critical tensile stress is most severe at the centerline despite the small amounts of deformation and strain-hardening. The growth of defects takes places in a direction perpendicular to the highest tensile stress by discontinuous cleavage propagation to form the penny shape. Blunting of the crack tip occurs in the region directly under the die and then the crack propagation rate is retarded to stop. Mechanical properties of the high-purity highchromium stainless steel play a very important role in the damage formation process.

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Analysis of the Effect of Strain Hardening on Central Bursting Defects in Drawing and Extrusion

Cited by 64 publications

References 0 publications

The influence of the drawing parameters and temperature rise on the prediction of chevron crack formation in wire drawing

The influence of the drawing parameters and temperature rise on the prediction of chevron crack formation in wire drawing

Ductile Fracture by Central Bursts in Drawn 2011 Aluminium Wire

Penny-shaped Central Bursting Defect in the Cold Drawing of High Chromium Ferritic Stainless Steel

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