Journal ArticleDOI
Dynamic Fracture Test of Laurentian Granite Subjected to Hydrostatic Pressure
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TLDR
In this article, a triaxial split Hopkinson pressure bar (SHPB) system is used to measure the dynamic fracture toughness of rocks under five hydrostatic pressures, and an empirical formula is proposed to describe the influences of the loading rate and the hydrostatic pressure on the rock dynamic fracture strength.Abstract:
Dynamic fracture failure of rocks subjected to static hydrostatic pressure is commonly encountered in deep underground rock engineering. The static fracture behavior of rocks under hydrostatic stress has been well studied in the literature. However, it is desirable to investigate the dynamic fracture failure of rocks under various hydrostatic pressures. In this study, a triaxial split Hopkinson pressure bar (SHPB) system is used to measure the dynamic fracture toughness of rocks under five hydrostatic pressures. The results show that dynamic fracture toughness under a certain hydrostatic pressure enhances with the increase of the loading rate, and the dynamic fracture toughness at the similar loading rate increases with the hydrostatic pressure due to the closure of microcracks in rocks. An empirical formula is proposed to describe the influences of the loading rate and the hydrostatic pressure on the rock dynamic fracture toughness.read more
Citations
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Journal ArticleDOI
Dynamic response and failure mechanism of hydrostatically pressurized rocks subjected to high loading rate impacting
TL;DR: In this article, a modified split Hopkinson pressure bar (SHPB) system was used to study the dynamic Young's modulus of hydrostatically pressurized sandstone specimens.
Journal ArticleDOI
Dynamic notched semi-circle bend (NSCB) method for measuring fracture properties of rocks: Fundamentals and applications
Wei Yao,Kaiwen Xia +1 more
TL;DR: In this article, the authors describe the detailed principles and state-of-the-art applications of dynamic semi-circle bend (NSCB) and advanced split Hopkinson pressure bar (SHPB) tests for dynamic fracture properties.
Journal ArticleDOI
Effects of axial pre-force and loading rate on Mode I fracture behavior of granite
Zhenyu Han,Diyuan Li,Xibing Li +2 more
TL;DR: In this article , the effects of axial pre-force and loading rate on dynamic fracture behavior of rocks were investigated using a modified split Hopkinson pressure bar (SHPB) device.
Journal ArticleDOI
Dynamic Mode II fracture behavior of rocks under hydrostatic pressure using the short core in compression (SCC) method
TL;DR: In this article, the short core in compression (SCC) method was designed and verified to measure the dynamic fracture energy of Fangshan marble (FM) subjected to different hydrostatic pressures through a triaxial dynamic testing system.
References
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Journal ArticleDOI
Suggested Methods for Determining the Dynamic Strength Parameters and Mode-I Fracture Toughness of Rock Materials
TL;DR: The properties of rocks under dynamic loading are important for the study of a whole range of rock mechanics and rock engineering problems, including blasting, protective design, explosives storage, rock bursts and seismic events as discussed by the authors.
Journal ArticleDOI
Some Fundamental Issues in Dynamic Compression and Tension Tests of Rocks Using Split Hopkinson Pressure Bar
TL;DR: The split Hopkinson pressure bar (SHPB) system has been used to quantify the dynamic compressive strength of rocks using the short cylindrical specimen and the dynamic tensile strength using the Brazilian disc (BD) specimen as discussed by the authors.
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Dynamic rock tests using split Hopkinson (Kolsky) bar system – A review
Kaiwen Xia,Wei Yao +1 more
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).
Journal ArticleDOI
Determination of dynamic fracture parameters using a semi-circular bend technique in split Hopkinson pressure bar testing
TL;DR: In this article, a method to simultaneously measure fracture initiation toughness, fracture energy, fracture propagation toughness, and fracture velocity was proposed for mode-I fractures in split Hopkinson pressure bar (SHPB) testing with a notched semi-circular bend (SCB) specimen.
Journal ArticleDOI
Effects of confining pressure and temperature on mixed-mode (I–II) fracture toughness of a limestone rock
TL;DR: In this paper, the authors studied fracture toughness under simulated reservoir conditions of high temperature and confining pressure using straight notched Brazilian disk (SNBD) specimens under diametrical compression, and showed that fracture toughness increased by a factor of about 3.7 under a σ3 of 28 MPa compared to that under ambient conditions.