Micromechanics and Constitutive Modeling of Granular Materials in Stress Reversaland Cyclic Loading Locaized Deformation: Experimental Observation and Modeling

摘要

The work focused on the process of initiation and growth of shear bands infrictional granules. A technique has been developed to study the deformation of lead doped lines of granules within the sample of a granular material, using the UCSD 5 large hollow cylindrical cell, together with flash X ray photography. acilities are modified and employed to develop in depth fundamental understanding of the microstructure of a shearband zone, and the spatial variation of the accompanying deformation. With this technique, we have captured the deformation that leads to shearband formation in several preliminary experiments. We have successfully solidified the sample containing shearbands, in situ. using a polymeric resin. We have then prepared sections for complete microstructural analysis, and have performed some preliminary analysis of the results. These and related issues are discussed in this report.