Prediction of central bursting during axisymmetric cold extrusion of a metal alloy containing particles

McVeigh, Cahal; Liu, Wing Kam

doi:10.1016/j.ijsolstr.2005.05.019

Cited by 24 publications

(21 citation statements)

References 21 publications

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“…The results show that the damage zone significantly increases as the friction coefficient increases resulting in a more inhomogeneous deformation across the wire. Note that, in the problem of extrusion, a similar effect was observed by McVeigh and Liu (2006). Throughout the Fig.…”

Section: Friction-temperature Rise and Damage Relationshipsupporting

confidence: 67%

“…It was found that the internal or chevron cracks may occur when the inclusion size is larger than the critical inclusion size. McVeigh and Liu (2006) applied micromechanical cell modeling technique to predict the formation of central bursts during extrusion and edge cracking during rolling. They examined material hardening effects, surface friction and die geometry on the occurrence of central bursting.…”

Section: Introductionmentioning

confidence: 99%

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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: Friction-temperature Rise and Damage Relationshipsupporting

confidence: 67%

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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“…Saanouni et al [10] applied continuum damage mechanics to thermo-elastoplastic finite element (FE) program and predicted crack formation in cold extrusion. McVeigh and Liu [11] used micro mechanical cell modeling technique and predicted the occurrence and position of chevron crack in extrusion and edge crack in rolling.…”

Section: Introductionmentioning

confidence: 99%

A study on chevron crack formation and evolution in a cold extrusion

2010

J Mech Sci Technol

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A numerical algorithm based on the element deletion method and rigid-viscoplastic finite element approach depending on CockcroftLatham and specific plastic work fracture criteria was applied to predict formation and evolution of possible cracking in a cold extrusion of aluminum and steel alloys. The Cockcroft-Latham fracture criterion induced an internal crack while an external crack occurred owing to the specific plastic work criterion in simulations. As a result, the Cockcroft-Latham criterion was found to be valid for predicting chevron cracking in comparison with the experimental observation available in the literature. Using the Cockcroft-Latham criterion, cracking was carefully investigated in terms of the size of the crack and gap distance between cracks depending on the number of elements and boundary condition at the punch interface. The critical damage values for the Cockcroft-Latham fracture criterion were also calculated based on the tensile instability and fracture conditions to investigate their effect on possible cracking. Finally, a processing map based on the Cockcroft-Latham fracture criterion for preventing chevron cracking in the cold extrusion of commercially available steel alloy was developed by considering processing parameters such as reduction in area and semicone angle. According to this investigation, the developed element deletion method with the Cockcroft-Latham fracture criterion was reasonably accurate for carrying out chevron cracking analyses in the cold extrusion with proper selection of a critical damage value.

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“…• The multiscale theory proposed and developed by Liu et al (see references mentioned above and also in [13][14][15][16][17]) is summarized in Section 3. The theory describes the multiscale character of damage and failure in random heterogeneous materials and gives rise to a set of equations that govern the physics of materials failure at each scale of interest.…”

Section: Introductionmentioning

confidence: 99%

Complexity science of multiscale materials via stochastic computations

Liu

Siad

Tian

et al. 2009

Numerical Meth Engineering

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SUMMARYNew technological advances today allow for a range of advanced composite materials, including multilayer materials and nanofiber-matrix composites. In this context, the key to developing advanced materials is the understanding of the interplay between the various physical scales present, from the atomic level interactions to the microstructural composition and the macroscale behavior. Using the developing 'multiresolution data sets mechanics', the 'predictive science-based governing laws of the materials microstructure evolutions' are derived and melted into a 'stochastic multiresolution design framework.' Under such a framework, the governing laws of the materials microstructure evolution will be essential to assess, across multiple scales, the impact of multiscale material design, geometry design of a structure, and the manufacturing process conditions, by following the cause-effect relationships from structure to property and then to performance.The future integrated multiscale analysis system will be constructed based on a probabilistic complexity science-based mathematical framework. Its verification, validation and uncertainty quantification are done through carefully designed experiments, and the life-cycled materials design for products design and manufacturing is performed through the use of petascale computing. The various techniques of microstructure reconstruction result in the generation of model microstructures that, at some level, has the same statistical properties as the real heterogeneous media. Having reconstructed the heterogeneous medium, one can then evaluate its effective properties via direct numerical simulation and compare these values with experimentally measured properties of the actual medium. The proposed analysis will be dynamic in nature to capture the multi-stage historical evolvement of material/structure performance over the life span of a product. In addition to providing more accurate assessment of structure performance with stochastic multiscale analysis, our development will provide the capability of predicting structure failures and system reliability to enable more reliable design and manufacturing decisions in product development.

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Prediction of central bursting during axisymmetric cold extrusion of a metal alloy containing particles

Cited by 24 publications

References 21 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

A study on chevron crack formation and evolution in a cold extrusion

Complexity science of multiscale materials via stochastic computations

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