Rheology of granular materials composed of crushable particles Duc-Hanh Nguyen, Émilien Azéma, Philippe Sornay and Farhang Radjaï Eur. Phys. J. E, 41 4 (2018) 50 Published online: 11 April 2018 DOI: 10.1140/epje/i2018-11656-1