Wei Yao

TL;DR: In this paper, a detailed review of the detailed procedures and principles of techniques for dynamic rock tests using split Hopkinson bars is presented, followed by the key loading techniques that are useful for dynamic tests with SHPB (i.e., pulse shaping, momentum-trap and multi-axial loading techniques).

TL;DR: In this paper, a modified split Hopkinson pressure bar system was used to load Brazilian disc (BD) samples hydrostatically, and then exerted dynamic load to the sample by impacting the striker on the incident bar.

TL;DR: In this paper, a two-dimensional ANSYS finite element simulation model is developed to calculate the dimensionless stress intensity factor of a given pre-load. And the results show that the fracture initiation toughness of rock increases with the loading rate, resembling the typical rate dependence of materials.

TL;DR: In this paper, the dynamic tensile strength of Longyou sandstone (LS) samples under different dynamic loading rates (ranging from 24 to 540 GPa/s) were obtained using the split Hopkinson pressure bar (SHPB) system.

TL;DR: In this paper, a split Hopkinson pressure bar (SHPB) system is used to exert the dynamic load to the rock specimen, which is placed in a specially designed holder, allowing the punch head to load the sample directly and in combination with momentum-trap technique in SHPB, it also enables soft recovery of the rock short rod and rock hollow cylinder produced by punching.