Fig. 6
From: Friction of granular systems: the role of solid–liquid interaction
Shear stress, \(\:\tau\:\), after sufficient shearing against the applied normal stress, \(\:\sigma\:\), obtained from grains-to-surface shear tests for the different grain minerals: (a) S1 and S5, (b) S2, and (c) S3, each saturated with different liquids.
