Dynamic Fracture Evolution and Mechanical Behavior of Sandstone Containing Noncoplanar Elliptical Flaws under Impact Loading

Figure 15

SEM images of typical crack coalescence between two flaws: (a, b) specimen S-45-0; (c, d) specimen S-90-0. The opposite arrows and the reverse arrows represent slipping and tensile area, respectively, and S and T represent shear and tensile cracks, respectively.