Multi equal channel angular pressing with rotational dies Kim, Y. H., Ma, Xiang, Hodgson, Peter and Barnett, Matthew 2003, Multi equal channel angular pressing with rotational dies, Materials science forum, vol. 426, no. 432, pp. 2777-2782. Attached Files Name Description MIMEType Size Downloads Title Multi equal channel angular pressing with rotational dies Author(s) Kim, Y. H. Ma, Xiang Hodgson, Peter Barnett, Matthew orcid.org/0000-0001-8287-9044 Journal name Materials science forum Volume number 426 Issue number 432 Start page 2777 End page 2782 Publisher Trans Tech Publications Place of publication Zurich, Switzerland Publication date 2003 ISSN 0255-5476 Keyword(s) rotational dies ultra-fine grain FEM ECAP upper bound method Summary The recent successful development of the equal channel angular pressing (ECAP) process in metals provides a feasible solution to produce ultra-fine or nano-grained bulk: materials with tailored material properties. However, ECAP is difficult to scale up commercially due to excessive load requirements. In this paper, a new Multi-ECAP process with die rotation is considered to obtain ultra-fine grain structured materials under a moderate deformation force. It is shown that an addition of torsion results in a reduction in the pressing force and an increase in severity of plastic deformation. An analysis using the upper bound method is found to be useful in predicting the pressing load and flow pattern of ECAP with and without rotational dies. Solutions are obtained for different inclined channel angles under different angular velocities of dies. Relative pressures are presented and some computed solutions are compared with those found by FEM simulation. The theoretical predictions of the pressing load are in good agreement with the simulation results. The amount of plastic deformation is determined by the inclined angle between the two intersecting channels, and the velocity ratio between the angular velocity of dies and the normal component of the punch velocity. Language eng Field of Research 091207 Metals and Alloy Materials Socio Economic Objective 970109 Expanding Knowledge in Engineering HERDC Research category C1 Refereed article in a scholarly journal Copyright notice ©2003, Trans Tech Publications Persistent URL http://hdl.handle.net/10536/DRO/DU:30008645 Document type: Journal Article Collections: Faculty of Science, Engineering and Built Environment School of Engineering and Technology Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 02 Jan 2009, 13:02:07 EST Mon, 18 Apr 2011, 16:56:49 EST Fri, 27 Sep 2013, 15:20:19 EST Wed, 21 Oct 2015, 16:41:24 EST Filtered Full Citation counts:   Cited 2 times in TR Web of Science Cited 2 times in Scopus Search Google Scholar Access Statistics: 1000 Abstract Views, 3 File Downloads  -  Detailed Statistics Created: Mon, 13 Oct 2008, 15:37:57 EST

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