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Using finite element modeling to examine the flow processes in quasi-constrained high-pressure torsion

Using finite element modeling to examine the flow processes in quasi-constrained high-pressure torsion
Using finite element modeling to examine the flow processes in quasi-constrained high-pressure torsion
Finite element modeling was used to examine the flow processes in high-pressure torsion (HPT) when using quasi-constrained conditions where disks are contained within depressions on the inner surfaces of the upper and lower anvils. Separate simulations were performed using applied pressures from 0.5 to 2.0 GPa, rotations up to 1.5 turns and friction coefficients from 0 to 1.0 outside of the depressions. The simulations demonstrate the distribution of effective strain within the depressions is comparable to the prediction by ideal torsion, and the applied pressure and the friction coefficient outside the depressions play only a minor role in the distribution of effective strain. The mean stresses during processing vary linearly with the distance from the center of the disk such that there are higher compressive stresses in the disk centers and lower stresses at the edges. The torque required for rotation of the anvil is strongly dependent upon the friction coefficient between the sample and the anvil outside the depressions
effective strain, finite element modeling, high-pressure torsion, quasi-constrained conditions, severe plastic deformation
0921-5093
8198-8204
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Cetlin, Paulo R.
6fe5efb8-7976-4d56-8aae-08cbf76b9628
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Figueiredo, Roberto B.
2e0060b8-6368-4d87-825a-c3cb90e92145
Cetlin, Paulo R.
6fe5efb8-7976-4d56-8aae-08cbf76b9628
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Figueiredo, Roberto B., Cetlin, Paulo R. and Langdon, Terence G. (2011) Using finite element modeling to examine the flow processes in quasi-constrained high-pressure torsion. Materials Science and Engineering: A, 528 (28), 8198-8204. (doi:10.1016/j.msea.2011.07.040).

Record type: Article

Abstract

Finite element modeling was used to examine the flow processes in high-pressure torsion (HPT) when using quasi-constrained conditions where disks are contained within depressions on the inner surfaces of the upper and lower anvils. Separate simulations were performed using applied pressures from 0.5 to 2.0 GPa, rotations up to 1.5 turns and friction coefficients from 0 to 1.0 outside of the depressions. The simulations demonstrate the distribution of effective strain within the depressions is comparable to the prediction by ideal torsion, and the applied pressure and the friction coefficient outside the depressions play only a minor role in the distribution of effective strain. The mean stresses during processing vary linearly with the distance from the center of the disk such that there are higher compressive stresses in the disk centers and lower stresses at the edges. The torque required for rotation of the anvil is strongly dependent upon the friction coefficient between the sample and the anvil outside the depressions

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More information

e-pub ahead of print date: 29 July 2011
Published date: 25 October 2011
Keywords: effective strain, finite element modeling, high-pressure torsion, quasi-constrained conditions, severe plastic deformation
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 335428
URI: http://eprints.soton.ac.uk/id/eprint/335428
ISSN: 0921-5093
PURE UUID: 42e4081b-7f52-42bb-9590-0df92db3ff7c
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 14 Mar 2012 12:13
Last modified: 10 Dec 2019 01:47

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