8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 109-116
DOI: 10.1051/jp4:2006134018
Phenomenological study of a cellular material behaviour under dynamic loadings
R. Bouix, Ph. Viot and J.-L. LatailladeLAMEFIP-ENSAM, Esplanade des Arts et Métiers, 33405 Talence Cedex, France
(Published online 26 July 2006)
Abstract
Polypropylene foams are cellular materials, which are
often use to fill structures subjected to crash or violent impacts.
Therefore, it is necessary to know and to characterise in experiments their
mechanical behaviour in compression at high strain rates. So, several
apparatus have been used in order to highlight the influence of strain rate,
material density and also temperature. A split Hopkinson Pressure Bar has
been used for impact tests, a fly wheel to test theses materials at medium
strain rate and an electro-mechanical testing machine associated to a
climatic chamber for temperature tests. Then, a rheological model has been
used in order to describe the material behaviour. The mechanical response to
compression of these foams presents three typical domains: a linear elastic
step, a wide collapse plateau stress, which leads to a densification, which
are related to a standard rheological model.
© EDP Sciences 2006