Abstract
The behaviour of porous material under dynamic conditions is assessed
by a micromechanical approach. By averaging, a general form for the
dynamic macrostress is proposed which recovers the static definition
when inertia effects are neglected. In this work, a representative
volume element for the porous material is defined as a hollow sphere.
Using an approximation of the velocity field and the principle of
virtual work, an explicit relationship is found between the macroscopic
stress and strain rate. The macrostress tensor is proved to be symmetric,
in the present formulation proposed for porous materials. Illustrations
are shown for hydrostatic tension or compression and also for axisymmetric
loading. In the latter case, the effect of stress triaxiality is
captured.
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