Abstract
Shear fracture energy has been measured for a granite and a limestone using a torsional method. We monitor failure with periodic stiffness determinations and measure strain energy released by integrating the load‐displacement record. Values of strain energy release rate (G3C) obtained for zero normal stress lie in the range 10²–10³ Jm−2. These fall between the values of G1C from tensile experiments and of shear fracture energy measured under high normal stress in triaxial tests.
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