... ABSTRACT: Combined effect of specimen size and loading rate on the rock tensile strength was investigated in this work. The dynamic rock fracture and disintegration was simulated numerically using the 3D hybrid finite-discrete element computer code CA3. The rock under the impact loading...

... failure in the underground mines. Brazilian test was carried out to obtain indirect tensile strength of coal samples under seven different loading rates. It was confirmed that indirect tensile strength of the coals decreased with increase in loading rate. The sensitivity of indirect tensile strength...

... geothermal reservoir hdr specimen Loading Rate hydraulic fracturing heat-treated hdr specimen ae number AE event frequency fracture toughness Wang Upstream Oil & Gas SCB specimen fracture mechanics characteristic room temperature heat-treated specimen different loading rate...

... Characterization Upstream Oil & Gas dynamic equilibrium equilibrium incident bar reservoir geomechanics strength Loading Rate physical test strain rate numerical simulation coefficient stress-strain curve particle rock strength compressive strength specimen contact point numerical result 1...

... test results. The results of this study illustrate the usefulness of the LS-SRM approach in modeling mechanical properties of hard rocks. reservoir geomechanics relation Loading Rate model parameter Modeling & Simulation Itasca particle fjr Reservoir Characterization resolution...

... are carried out under dynamic loading condition. Because rocks show strong loading rate/strain rate dependency [e.g., 4,7], understanding the Mode II dynamic fracture toughness is also of significant importance. Several studies for both the fracture toughness testing and specimen shape were carried out...

... to study the conditions for which the induced hydraulic fractures become effective and propagate in rock. Our results show that as the loading rate decreases, only a few of these fractures will propagate. As the loading rate increases, more perforations become active, until ultimately all result in crack...

... Abstract: This paper presents experiments showing that the nominal tensile strength of granite specimens measured in three-point bending tests increases with the logarithm of the loading rate. Based on these experiments, we propose a criterion for macroscopic breakage wherein failure occurs...

... increases with the loading rate, revealing the rate dependency that is common for engineering materials. The modeling of the failure process matches well with the experimental results, demonstrating the applicability of the DCA model in predicting the dynamic tensile failure of rock materials...

... at stress levels beyond those possible in-situ. The explanation for the inconsistency was found to be the strong impact of loading rate on the pore-collapse stress level. The applicability of an existing rate type compaction model for the Harlingen chalk was confirmed by new variable loading rate laboratory...

... through new degrees of freedom in overlapping elements. Some specific aspects related to the fracturing of a rock mass subjected to a general bench blast are discussed, such as the influence of mesh refinement, the effects of the stress-loading rate and the number and distribution of preexisting cracks...

... pretension static pretension upstream oil & gas dynamic tensile failure strain gauge total tensile strength loading rate tensile failure dynamic tensile strength strength reservoir characterization mpa incident bar specimen stress wave failure pattern tensile strength...

... surface energy increases with the loading rate. Above results indicate a trade-off should be established between the fragment size and energy consumption . 1. INTRODUCTION Crushers are widely used in the mining industry all over the world, which break rocks to extract specific minerals or specific...

... friction fluid dynamics creep compaction model compaction behaviour equation laboratory experiment upstream oil & gas loading rate consolidated sandstone reservoir characterization compaction experiment effective stress compressibility isotach explanation subsidence...

... in evolution of load between stress-strain curves when applying different loading rates. The material investigated is outcrop chalk from Stevns, Southern part of Denmark, with a porosity of 43 to 44% and subjected to varying loading rates. The Biot critical frequency is a function of the fluid properties...

... crack growth loading rate dependency rock sang-ho cho toughness granite sample fracture toughness test specimen granite hydraulic fracturing sndb sample dynamic test limestone plane yeongju granite notch dynamic fracture toughness loading rate fracture toughness upstream oil...

... is reviewed and discussed in detail. Dynamic fracture parameters are obtained by quantitative assessments of testing methods, and controlling factors and failure patterns are also discussed to validate these properties. Fracture toughness and fracture behaviour change with loading rate, in particular...

.... The transmission coefficient for the non-filled contact fracture increases with higher loading rate. The filled fracture displays lower strength and larger deformation than the non-filled contact fracture, which likely induces the instability of rock masses. The transmission coefficient for the filled fracture...

... is more sensible and extent and direction of fractures depend on theses stresses. On the other hand, the blast loading rate (i.e. applied pressure waveform) which depends on explosive properties and also blasthole dimensions are controllable and affect the pattern of different fracture zones around...

... theory, like in the direct-tensile test, but instead is propagation of a fracture or crack until the cylinder splits. Hence, the Brazilian test results are subjected to the fracture-mechanics size effect [1]. In addition, experimental studies pointed out that loading rate, width of and friction between...