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A detailed model of high pressure torsion

Khoddam, S. 2017, A detailed model of high pressure torsion, Materials Science and Engineering A, vol. 683, pp. 256-263, doi: 10.1016/j.msea.2016.11.025.

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Title A detailed model of high pressure torsion
Author(s) Khoddam, S.ORCID iD for Khoddam, S. orcid.org/0000-0002-5205-2086
Journal name Materials Science and Engineering A
Volume number 683
Start page 256
End page 263
Total pages 8
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2017-01-23
ISSN 0921-5093
Keyword(s) severe plastic deformation
parametric representation
closed-form solution
Summary High Pressure Torsion (HTP) is a popular physical simulator to produce ultra-fine grained materials. Existingsolutions of HPT predict a zero deformation and grain refinement near its sample’s longitudinal axis. However,experimental observations confirm that this is not typically the case. For a more realistic study of material’s flowduring the test, a detailed model was presented here in which the sample was represented as a “CylindricalSegment (CS)” with a small run-out. A HPT-CS model was developed which included a parametricrepresentation of the 3D problem and a kinematically admissible velocity field. The model was solved andthe effective strain rate and strain for the problem were formulated. To verify the HPT-CS solution, a specialcase with zero run-out and two general case solutions (non-zero run-out) were compared with the existingsolution of HPT as the reference. The sample comparisons confirmed the accuracy of the proposed solution.Distributions of effective strain rate and strain along the sample’s longitudinal axis were presented for thegeneral case solutions. These increased linearly from zero at the sample’s mid-plane to their maximum at itstop-plane. The maximum values for the second case were 0.138 s−1 and 0.290, respectively. An explanation forthe grain refinement near the sample’s centre was suggested based on the presented HPT-CS’ solution.
Language eng
DOI 10.1016/j.msea.2016.11.025
Field of Research 099999 Engineering not elsewhere classified
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2016, Crown Copyright
Free to Read? No
Free to Read Start Date 2019-01-24
Persistent URL http://hdl.handle.net/10536/DRO/DU:30090333

Document type: Journal Article
Collection: Institute for Frontier Materials
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