Polymeric Foam Behaviour Under Impact Tests:
Deformation Study By Micro Tomography
Author(s)
P. Viot & D. Bernard
Abstract
The mechanical behaviour of polymeric foams depends on several parameters
such as temperature, material density and strain rate. This last point implies that
compression tests on conventional testing machines are not sufficient. The
behaviour characterisation requires special apparatus such as the fly wheel, drop
tower or Hopkinson bar, allowing high speeds of compression.
The studied polypropylene foams are multi-scale materials; agglomerated
grains (diameter from 2–3 mm) are visible to the naked eye and, at the
microscopic scale, each grain is composed of smallest closed cells (diameter of a
few tens of microns). The response of a sample to a shock presents three
regimes; an elastic phase followed by a plastic phase and finally the
densification. The plastic phase is of prime interest since a great part of the shock
energy is dissipated there.
Micro tomography was used in order to better understand the damage
mechanisms during the plastic plateau. The final objective of this work is to
determine the 3D-strain field of porous materials at several levels of shock. As
tomography is not fast enough to directly follow the impact deformation,
interrupted impact tests were carried out by controlling the levels of the sample
deformation. Between each impact step, a micro tomographic analysis will
enable the analysing of the progressive deformation of the sample. The results of
these impact tests completed by the micro tomographic visualisation are
presented and commented in this paper.
Keywords: foam, cellular material, dynamic loading, impact, micro
tomography.
Keywords
foam, cellular material, dynamic loading, impact, micro
tomography.
Related Book
Other papers in this volume
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