Abstract
The objective of this paper is to investigate the complete process of dynamic crack propagation in brittle materials under different loading rates. By using Improved Single Cleavage Semi-Circle (ISCSC) specimens and Split Hopkinson Pressure Bar equipment, experiments were conducted, with the fracture phenomenon and crack propagation of tight sandstone investigated. Meanwhile, the process of crack propagation behaviour was simulated. Moreover, with the experimental–numerical method, the crack propagation dynamic stress intensity factor (DSIF) was also calculated. Then, the crack propagation toughness of tight sandstone under different loading rates was investigated and illustrated elaborately. Investigation results demonstrate that ISCSC specimens can achieve the crack arrest position unchanged, and the numerical simulation could effectively deduce the actual crack propagation, as their results were well matched. During crack propagation, the crack propagation DSIF in the whole process increases with the rising loading rate, and so does the crack propagation velocity. Several significant dynamic material parameters of tight sandstone are also given, for engineering reference.
Highlights
Rock mass contains plentiful joints, fractures, and crevices with different sizes and shapes, presenting complex heterogeneous formations
As8.three rates are applied in the simulation, crackpropagation propagation path performs universality rates are applied in numerical the numerical simulation,the the crack path performs some some universality appearances as well as some difference in detail
The crack arrest position is predictable in Improved Single Cleavage Semi-Circle (ISCSC) specimens, which can be applied in investigating dynamic crack propagation behavior and measuring crack propagation dynamic stress intensity factor (DSIF) in a complete process
Summary
Rock mass contains plentiful joints, fractures, and crevices with different sizes and shapes, presenting complex heterogeneous formations. Under impact loads, these defects will initiate, propagate and evolve [1,2,3,4,5]. A complete study on rock dynamic crack propagation under different loading rates is of profound importance. The whole process of failure characteristics in pre-existing crack rock mass under impact loading has been discussed in many research works. Studies have already demonstrated the importance of selecting a specimen with a suitable configuration during studies on rock fracture mechanics.
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