Abstract
Split Hopkinson Pressure Bar method is particularly efficient to approach materials behaviour at high strain rates. A special device called Three-Dimensional Split Hopkinson Pressure Bar (3D-SHPB), using a radial bar in contact with the specimen through a confining cylinder, allows measurement of radial stress with time. It is then possible to study the different loading paths in terms of mean stress and deviatoric stress. The comparison of the different experiments performed (confining cylinder, confining pressure...) shows a strong influence of the loading path on the dynamic response. At grain size scale, several investigations have been made to evaluate the evolution of grain size distribution after testing. Experimental results show that the 3D-Split Hopkinson Pressure Bar is a very promising tool for laboratory dynamic testing on soils.
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