Investigation into channel angular extrusion and the UREAD energy absorption technique
Citation:
R.Lupoi and F.Osman, Investigation into channel angular extrusion and the UREAD energy absorption technique, International Journal of Mechanical Sciences, 50, 5, 2008, 966 - 973Download Item:
IJMS_ Lupoi and Osman.pdf (Main article (peer-reviewed)) 1.199Mb
Abstract:
Channel Angular Extrusion(CAE) processes are characterised by imposing high
level of strain into deformable materials using simple tools where the material is contained
within a specific path. Tool stresses could be critica
l. The process is capable of reducing
the thickness of flat sheets or slabs, and using Equal Channels, it could be used for material
refinement where internal grain size changes to nano
-
scale structure by intense shearing. In
this paper, the applicati
ons of CAE have been extended to include the construction of
Universal Re
-
useable Energy Absorption Devices (UREAD) using equal channels. An
investigation is carried out into the distribution of contact stresses at the tool/material
interface. The m
odel employs the slab method of analysis and splits the material inside the
channels, which intersects at 90
̊
, into two zones; one causes the deformation while the other
remains rigid. Normal stresses that may develop at the contact surface between the
deformable material and the tools are analysed for various cases of CAE and are compared
with those obtained by the Finite Element Analysis. Experimental investigation on UREAD
devices using lead are also presented where the energy absorbed reached a m
aximum of 160 J
for 100mm cross sectional area and 30mm stroke. An experimental set up for measuring
contact pressure in CAE/ECAE is introduced and measurements at different depth of the CAE
entry channel are presented. The sensing mechanism is based
upon the sensitive pressure
pin technique.
Author's Homepage:
http://people.tcd.ie/lupoirDescription:
PUBLISHED
Author: LUPOI, ROCCO
Type of material:
Journal ArticleSeries/Report no:
International Journal of Mechanical Sciences;50;
5;
Availability:
Full text availableKeywords:
pressure pin technique, contact stresses,, Stress analysis, UREAD, energy absorption, ECAE, CAEDOI:
http://dx.doi.org/10.1016/j.ijmecsci.2007.09.003Licences: