Impact of sample scaling on shear strength: coupled effects of grains size and shape Sandra Linero-Molina, Emilien Azéma, Nicolas Estrada, Stephen Fityus, John Simmons and Arcesio Lizcano EPJ Web Conf., 249 (2021) 06011 Published online: 07 June 2021 DOI: 10.1051/epjconf/202124906011