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Effect of crack angle and concrete strength on the dynamic fracture behavior of rock-based layered material containing a pre-existing crack

Guo Tengfei, Liu Kewei, Li Xiang, Jin Peng, Yang Jiacai, Zhang Aimin, Zou Liansong

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e198, 2023

Dynamic fracture behavior of rock-based layered material containing a pre-existing crack was investigated, which is crucial to evaluate the stability of rock-based systems. Dynamic tests on semi-circular bend (SCB) samples were conducted with a split-Hopkinson Pressure Bar (SHPB) system and the cracking process was collected using digital image correlation (DIC). An MTS Insight 30 electromechanical test equipment was adopted to perform static fracture experiment for comparison. Different typical fracture modes were classified: interfacial fracture, combined mode of tensile–shear fracture, and combined mode of compression–shear fracture. Regardless of static load or dynamic load, the fracture mode is controlled by crack dip angle, and the peak load is proportional to crack dip angle. The increase in concrete strength makes a strengthening impact on the bearing capacity of SCB sample, which can prevent the propagation of secondary cracks in the concrete. Both static and dynamic fracture toughness are significantly affected by dip angle. The difference between static and dynamic fracture toughness of mixed-mode reduces initially and subsequently increases with an increase in dip angle. Furthermore, comparing with static fracture toughness, dynamic fracture toughness substantially depends stronger on dip angle. The dip angle and concrete strength have an obvious effect on the fracture resistance.