Abstract
Double torsion (DT) tests were carried out for Inada granite and Shirahama sandstone in water of between 1°C and 80°C. It was confirmed that the stress corrosion index decreased and crack velocity under the same stress intensity factor increased in the higher water temperatures. Activation energy from DT tests was compared with that from uniaxial compression tests, indirect tensile tests and CB (Chevron Bend) tests. Effect of water as well as thermal activation of stress corrosion was regarded as subcritical crack growth factors. Discussions on experimental results were made considering thermal stress analyses with FEM, fractal dimension of crack geometries and the DT tests results for glass specimens.
