Fig. 4
From: The influence of cyclic loading-unloading rates on the uniaxial mechanical anisotropy of coal
The stress-strain curves of specimens with different anisotropy angles under various loading-unloading rates: (a) 0º, (b) 22.5º, (c) 45º, (d) 67.5º, and (e) 90º, (f) schematic diagram of loading-unloading stress-strain curves.
