DYMAT 2009
Volume 1, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 213 - 218
Section Experimental Techniques
Published online 15 September 2009
DYMAT 2009 (2009) 213-218
DOI: 10.1051/dymat/2009029

Dynamic tests on a cohesive and frictional material. Influence of high pressure and high strain rate on compaction and shear

P. Bailly1, F. Delvare1, M. Biessy2 and D. Picart2

1  ENSI Bourges, Institut PRISME, 18020 Bourges, France
2  CEA, DAM, Le Ripault, 37260 Monts, France

Published online: 15 September 2009

Many of aggregate composites are made of small size particles mixed with a highly compliant rubbery polymer. When the loading leads to high pressures, the behaviour gets closer to this of cohesive, frictional, and compactable materials. When this kind of material is subjected to an impact, the loading domain is the case of high pressure (from 100 to 1000 MPa) and high strain rate (roughly 1000 s−1). An experimental study is led by using the technique of the SHPB. The specimens are small cylinders placed in a ring which creates a passive confinement by opposing to the radial displacements. The instrumentation of the ring allows to estimate the radial stress and the radial displacement. The main point is that it makes possible the follow-up of the spherical and deviatoric parts of the stress and strain tensors during the test, without restrictive hypothesis on the behaviour of the material. The results show a high sensitivity to the strain rate. The stresses evolutions show that the frictional phenomenon is sensitive even under high pressures.

© EDP Sciences 2009