SEM in-situ study on the effect of offset-notch on basalt cracking behavior under three-point bending load

Three-point bending fracture tests of basalt with the different offset-notch locations were carried out by an in-situ observation with scanning electron microscope (SEM). These results indicated that the effects of offset-notch location on the crack initiation and propagation behaviors should be classified, the former is not obvious and the latter is sufficiently obvious. Most SEM images demonstrated that the micro-mechanical damage model can...