Modelling of real area of contact between tool and workpiece in metal forming processes including the influence of subsurface deformation

Chris Valentin Nielsen; Paulo A. F. Martins; Niels Oluf Bay

doi:10.1016/j.cirp.2016.04.126

Modelling of real area of contact between tool and workpiece in metal forming processes including the influence of subsurface deformation

Chris Valentin Nielsen, Paulo A. F. Martins, Niels Oluf Bay

University of Lisbon

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Abstract

New equipment for testing asperity deformation at various normal loads and subsurface elongations is presented. Resulting real contact area ratios increase heavily with increasing subsurface expansion due to lowered yield pressure on the asperities when imposing subsurface normal stress parallel to the surface. Finite element modelling supports the presentation and contributes by extrapolation of results to complete the mapping of contact area as function of normal pressure and one-directional subsurface strain parallel to the surface. Improved modelling of the real contact area is the basis for estimating friction in the numerical modelling of metal forming processes.

Original language	English
Journal	CIRP Annals : Manufacturing Technology
Volume	65
Pages (from-to)	261-264
ISSN	0007-8506
DOIs	https://doi.org/10.1016/j.cirp.2016.04.126
Publication status	Published - 2016

Keywords

Friction
Metal forming
Real contact area

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title = "Modelling of real area of contact between tool and workpiece in metal forming processes including the influence of subsurface deformation",

abstract = "New equipment for testing asperity deformation at various normal loads and subsurface elongations is presented. Resulting real contact area ratios increase heavily with increasing subsurface expansion due to lowered yield pressure on the asperities when imposing subsurface normal stress parallel to the surface. Finite element modelling supports the presentation and contributes by extrapolation of results to complete the mapping of contact area as function of normal pressure and one-directional subsurface strain parallel to the surface. Improved modelling of the real contact area is the basis for estimating friction in the numerical modelling of metal forming processes.",

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AU - Nielsen, Chris Valentin

AU - Martins, Paulo A. F.

AU - Bay, Niels Oluf

PY - 2016

Y1 - 2016

N2 - New equipment for testing asperity deformation at various normal loads and subsurface elongations is presented. Resulting real contact area ratios increase heavily with increasing subsurface expansion due to lowered yield pressure on the asperities when imposing subsurface normal stress parallel to the surface. Finite element modelling supports the presentation and contributes by extrapolation of results to complete the mapping of contact area as function of normal pressure and one-directional subsurface strain parallel to the surface. Improved modelling of the real contact area is the basis for estimating friction in the numerical modelling of metal forming processes.

AB - New equipment for testing asperity deformation at various normal loads and subsurface elongations is presented. Resulting real contact area ratios increase heavily with increasing subsurface expansion due to lowered yield pressure on the asperities when imposing subsurface normal stress parallel to the surface. Finite element modelling supports the presentation and contributes by extrapolation of results to complete the mapping of contact area as function of normal pressure and one-directional subsurface strain parallel to the surface. Improved modelling of the real contact area is the basis for estimating friction in the numerical modelling of metal forming processes.

KW - Friction

KW - Metal forming

KW - Real contact area

U2 - 10.1016/j.cirp.2016.04.126

DO - 10.1016/j.cirp.2016.04.126

M3 - Journal article

SN - 0007-8506

VL - 65

SP - 261

EP - 264

JO - CIRP Annals : Manufacturing Technology

JF - CIRP Annals : Manufacturing Technology

ER -

Modelling of real area of contact between tool and workpiece in metal forming processes including the influence of subsurface deformation

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Keywords

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