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Numerical prediction of the effects of material properties onstrain behavior during equal channel angular pressing

Published online by Cambridge University Press:  22 November 2013

M. Ebrahimi ,
F. Djavanroodi ,
C. Gode  and
K.M. Nikbin
M. Ebrahimi
Affiliation:
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran. e-mail: [email protected]
F. Djavanroodi
Affiliation:
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran. e-mail: [email protected] Department of Mechanical Engineering, Imperial College, London, SW7, UK
C. Gode
Affiliation:
School of Denizli Vocational Technology, Program of Machine, Pamukkale University, 20100 Denizli, Turkey
K.M. Nikbin
Affiliation:
Department of Mechanical Engineering, Imperial College, London, SW7, UK
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Abstract

Equal channel angular pressing is both a novel and an industrialized process among severeplastic deformation methods to fabricate ultra-fine-grained metals and alloys.Verification of a three-dimensional finite element model which compares various strengthcoefficients and strain-hardening exponents (virtual materials) defined for the plasticdeformation behavior of materials was performed with experimental tests. The virtualprocess numerically analyzed the effects of the strain behavior and pressing force. Theresults show that strength coefficient enhancement leads to decreased effective strainvalue, heterogeneous strain distribution and higher pressing force, and an increment inthe strain-hardening exponent results in lower pressing force. However, this parameterdoes not have an obvious effect on the effective strain magnitude and strain dispersaluniformity. Furthermore, the highest imposed effective strain, the best straindistribution homogeneity and the lowest required punch load were achieved for the deformedmaterial with the lowest strength coefficient and highest strain-hardening exponent.

Keywords

Equal channel angular pressingfinite element modelingmaterial propertiesstrain behavior
Type
Research Article
Information
Metallurgical Research & Technology , Volume 110 , Issue 5 , 2013 , pp. 341 - 348
Copyright
© EDP Sciences 2013

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