Joseph F. Labuz
University of Minnesota
Ultimate tensile strengthDigital image correlationGeologyEngineeringBrittlenessComposite materialAcoustic emissionGeotechnical engineeringMaterials scienceStiffnessSofteningPlane stressLateral earth pressureFracture (geology)MechanicsFracture mechanicsPorosityStructural engineeringStress (mechanics)Shear (geology)Rock mechanics
190Publications
32H-index
3,135Citations
Publications 189
Newest
#1Qing Lin (China University of Petroleum)H-Index: 11
#2Hui-na Yuan (THU: Tsinghua University)H-Index: 3
Last. Joseph F. LabuzH-Index: 32
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Abstract Fracture tests were performed on sandstone specimens under three-point bending with a variety of notch positions to achieve KII/KI = 0–12%. At peak load, the maximum crack opening displacement measured by digital image correlation was 45 μm under mixed mode loading and 30 μm under mode I, and these values were used to determine the length of the cohesive zone: 10–12 mm for mixed mode and 5–7 mm for mode I. For mixed mode fracture, the displacement in the cohesive zone was identified to ...
50 CitationsSource
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
#2Joseph F. LabuzH-Index: 32
Last. A. Fakhimi (TMU: Tarbiat Modares University)H-Index: 1
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1 Citations
#1Jia Liang Le (UMN: University of Minnesota)H-Index: 18
#2Jonathan Manning (UMN: University of Minnesota)H-Index: 1
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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This study presents a comprehensive set of size eff ect experiments on both monotonic strength and fatigue crack kinetics for Berea sandstone. It is observed that for all specimens the Paris-Erdogan law is applicable for a wide range of the amplitudes of the stress intensity factor. The fatigue tests also indicate that there is a small-crack growth regime at the beginning stage of cyclic loading, where the growth rate decreases as the crack initiates from the notch tip. It is shown that the frac...
#1Roman Y. MakhnenkoH-Index: 12
#2Joseph F. LabuzH-Index: 32
Last. Lyesse LalouiH-Index: 52
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Geologic CO2 sequestration is considered to be the most promising technique to reduce the concentration of greenhouse gases in the atmosphere. Among all the storage options, deep saline aquifers have the greatest potential and due to their worldwide occurrence can play a major role in reduction of carbon dioxide emissions. In sedimentary basins at depths below 800 meters, CO2 usually exists in supercritical condition (scCO2), which means that its temperature and pressure are above 31.1o C and 7....
1 Citations
#1Joseph F. LabuzH-Index: 32
#1Roman Y. Makhnenko (UMN: University of Minnesota)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
A plane strain condition for testing rock is developed through passive restraint in the form of a thick-walled cylinder. The so-called biaxial frame generates the intermediate principal stress that imposes a triaxial state of stress on a prismatic specimen. Major and minor principal stresses and corresponding strains are accurately measured, providing data to calculate the elastic (Young’s modulus and Poisson’s ratio), inelastic (dilatancy angle), and strength (friction angle and cohesion) param...
24 CitationsSource
#1Jia Liang LeH-Index: 18
#2Jonathan Manning (UMN: University of Minnesota)H-Index: 1
Last. Joseph F. LabuzH-Index: 32
view all 3 authors...
#1Roman Y. Makhnenko (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 12
#2Joseph F. LabuzH-Index: 32
Last. Joseph F LabuzH-Index: 1
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Deep saline aquifers have a great potential for geologic carbon dioxide (CO2) sequestration and proper assessment of host and cap rock is needed to guarantee that the procedure is safe. Temperatures and pressures at which most of the possible host rocks exist dictate that CO2 is present in a supercritical condition, having both gas and liquid properties. Hence, rock-fluid interaction has to be studied and measurements of poroelastic parameters are necessary. Sandstone formations are mostly consi...
1 Citations
#1Roman Y. Makhnenko (UMN: University of Minnesota)H-Index: 12
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
6 Citations
#1Dmitry Nikolskiy (UMN: University of Minnesota)H-Index: 5
#2Sofia G. Mogilevskaya (UMN: University of Minnesota)H-Index: 23
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract This paper presents a new boundary element-based approach for solving three-dimensional problems of an elastic medium containing multiple cracks of arbitrary shapes. The medium could be loaded by far-field stress (for infinite domains), surface tractions (including those at the cracks surfaces), or point loads. Constant body forces are also allowed. The elastic fields outside of the cracks are represented by integral identities. Triangular elements are employed to discretize the boundar...
9 CitationsSource