Loading behaviour of 900 'UREAD' energy channels
Citation:
R.Lupoi and F.Osman, Loading behaviour of 900 'UREAD' energy channels, International Journal of Crashworthiness, 13, 2, 2008, 195 - 203Download Item:
Abstract:
Most engineering products are designed to either deliver or withstand a specific maximum force or level of
energy. It is important however that the design of a structure or a machine incorporates an external or internal
mecha
nism to overcome excessive loading, so as to reduce human discomfort and unsafe operations. Material elastic
properties are exploited in most energy absorption devices but they have the disadvantage of generating rebound
forces, in some cases comparable t
o those being absorbed.
This paper examines the validity of a new concept which has been implemented into a Universal Re
-
usable Energy
Absorption Device
–
‘UREAD’. A passageway made out of intersecting channels of a constant cross
-
sectional area
is con
structed inside the device where, upon the application of force, a piece of deformable material is allowed to flow
through it. Energy is dissipated through intense shearing at each intersecting channels
. Experiments were applied to
devices characteri
zed by two intersecting channels at 90
̊
. Passageways of square and circular cross sectional areas in
the range of 60
-
100mm
2
were tested using Silicon gum and lead.
The results showed a typical pattern of deformation
where the load remains almost consta
nt after the initiation of plastic deformation through the channels. Material
yield strength, billet length, and passage way cross
-
sectional area appear to be major contributors to the level of
absorbed energy. The pattern of deformation under plane s
train conditions was investigated by the Finite Element
Analysis (FEA), and the predictions showed a yielding process that is dominated by internal shearing zones.
Author's Homepage:
http://people.tcd.ie/lupoirDescription:
PUBLISHED
Author: LUPOI, ROCCO
Type of material:
Journal ArticleSeries/Report no:
International Journal of Crashworthiness;13;
2;
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Full text availableDOI:
http://dx.doi.org/10.1080/13588260701788526Metadata
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