Comparative analysis of fracture characteristics between rock and rock-like materials

In order to investigate the characteristics of rock and rock-like materials during fracture process, notched semi-circular bending (SCB) experiments 3 rocks 2 were conducted in this paper. The process crack mouth opening was measured with a clip gauge. Acoustic emission used analyze damage failure mode specimens. Meanwhile, zone (FPZ) analyzed digital image correlation (DIC). Finally, differences between observed polarized microscope, formation mechanism FPZ discussed. results indicate that sequence from brittleness plasticity is gypsum, marble, granite, concrete fine sandstone. velocity granite reaches 0.02–0.025 mm/s, far exceeding sandstone at 0.003 mm/s 0.005 mm/s. stronger geomaterials, less significant their acoustic effect. Only few emissions occur gypsum 8 hits. Its occurs instantaneously rather than through tensile failure. Sandstone has strongest plasticity, large count before after fracture, hit number 5062, which 630 times pure gypsum. accumulation 94% sandstone, 89% concrete, 80% 60% marble showing shear except addition, smaller size. only about mm, can be considered as lacking, while other are 6–11 mm. depends on whether an interlocking structure formed inside material, related base material crystalline or aggregate particle