The results of shcar strength on rough fracture indicalc that elevated temperatures effect to granile behavior.
The effect fo temperatures insignificant below 373 kelvin suqqesting thas tlhis temperatures ranges is in the brittle regimc.
Above 373 kelvin the temperatures effect is greater (Ohnaka 1995.) The increasing temperatures and the cause of shcar displacement increasing and shear strength decreasing This may bc related to
Development fo localized plastic deformation in shear failure zone