Friction and Localization Associated with Non-spherical Particles
Effect of rotations of particles of non-spherical shape is considered. Under combined action of shear and compressive forces, the moment balance produces apparent negative stiffness. In the case when friction is controlled by rotating particles non-sphericity leads to oscillating friction force. In the case of particulate materials in compression this may lead, under certain magnitudes of compression, to the initiation of global negative stiffness and, subsequently, strain localization.
KeywordsParticle rotation Negative stiffness Effective characteristics Self-consistent method Instability
This research is supported by ARC Discovery Grants DP0988449, DP0773839 and WA Geothermal Centre of Excellence.
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