Contact evolution in granular materials with inherently anisotropic fabric

This paper presents the results of two triaxial compression tests performed on approximately 9×10 3 oblate spheroids (lentils) with different initial orientations respect to loading axis (approximately 30° and 60°). Typical stress-strain information is complemented x-ray tomography scans every 1 % strain. Starting from an labelling particles, a new technique used obtain unprecedented detail tracking all particles through time. rich dataset analysed perspective inter-particle contacts (building previous metrological work this subject) revealing that mean contact orientation in both samples rotates towards direction σ at rate depending orientation. Different trends are observed for alignment orientation, significant evolution sample prepared which not as pronounced other sample.