Joseph F. Labuz
University of Minnesota
Ultimate tensile strengthDigital image correlationGeologyEngineeringBrittlenessComposite materialAcoustic emissionGeotechnical engineeringMaterials scienceStiffnessSofteningPlane stressLateral earth pressureFracture (geology)MechanicsFracture mechanicsStructural engineeringStress (mechanics)Shear (geology)Rock mechanics
190Publications
32H-index
3,135Citations
Publications 189
Newest
Pressure decline caused by the extraction of oil from deep sedimentary layers depends on the pore modulus Kpp, a poroelastic parameter that characterizes the effect of pressure change on pore volum...
11 CitationsSource
#1Ali Fakhimi (TMU: Tarbiat Modares University)H-Index: 18
#2Qing Lin (China University of Petroleum)H-Index: 11
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract Rock fracture and the induced displacement field are investigated through physical and numerical experiments. A Berea sandstone specimen with a central notch was tested in three-point bending. Digital image correlation (DIC) was used to obtain the displacement patterns as the fracture initiated and propagated. The DIC results clearly show the development of a damage zone and displacement discontinuity along the center line of the beam at peak load. It is suggested that a traction-free o...
21 CitationsSource
#1Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
#2Feitao Zeng (DUT: Dalian University of Technology)H-Index: 4
Last. Yuan Li (USTB: University of Science and Technology Beijing)H-Index: 3
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Abstract A failure criterion typically is phenomenological since few models exist to theoretically derive the mathematical function. Indeed, a successful failure criterion is a generalization of experimental data obtained from strength tests on specimens subjected to known stress states. For isotropic rock that exhibits a pressure dependence on strength, a popular failure criterion is a linear equation in major and minor principal stresses, independent of the intermediate principal stress. A gen...
32 CitationsSource
#2Jacob SharpeH-Index: 1
Last. Joseph F. LabuzH-Index: 32
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#1Brian L. FoltaH-Index: 1
#2Jacob SharpeH-Index: 1
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#1Ali TarokhH-Index: 8
#2Joseph F. LabuzH-Index: 32
Deposited here are Excel spreadsheets containing all figure data except for figures 1 and 2. Descriptions of each file can be found in "Tarokh-Labuz-Readme.txt".
Source
#1Feitao Zeng (UMN: University of Minnesota)H-Index: 4
#2Yuan Li (USTB: University of Science and Technology Beijing)H-Index: 3
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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AbstractPaul-Mohr-Coulomb (PMC) failure criterion provides enhanced representations of pyramidal failure surfaces, with recognizable material parameters, by considering all three principal stresses...
6 CitationsSource
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
#2Yuan Li (USTB: University of Science and Technology Beijing)H-Index: 3
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Knowledge of compactant behavior and the associated subsidence for high porosity carbonate formations is crucial in applications such as enhanced oil recovery. To gain insights into inelastic compaction and failure modes of a porous chalk under different loading histories, triaxial compression experiments were conducted on a high porosity (45 %) chalk, tested using three stress paths: no precompaction (virgin rock), precompacted to 30 MPa, and precompacted to 60 MPa. For the virgin chalk with no...
7 CitationsSource
#1Ali Fakhimi (New Mexico Institute of Mining and Technology)H-Index: 18
#2Ali Tarokh (UMN: University of Minnesota)H-Index: 8
Last. Joseph F. LabuzH-Index: 32
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Abstract A three point bending fracture test was performed on a typical quasi-brittle material (Berea sandstone). The loading was continued into the post-peak region where crack growth was visible along the center line of the beam. Subsequent inspection of a portion of the specimen showed that part of the fracture offered no resistance to loading – a cohesionless crack existed. Digital image correlation was used to study the nature of the displacement discontinuity associated with the cohesionle...
14 CitationsSource
#1Ali Tarokh (UMN: University of Minnesota)H-Index: 8
#2Roman Y. Makhnenko (UIUC: University of Illinois at Urbana–Champaign)H-Index: 12
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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The zone of microcracks surrounding a notch tip—the process zone—is a phenomenon observed in fracture of quasi-brittle materials, and the characterization of the process zone is the topic of the paper. Specimens of different sizes with a center notch fabricated from a granite of large grain (Rockville granite, average grain size of 10 mm), were tested in three-point bending. Acoustic emissions were recorded and locations of microcracks were determined up to peak load. The results show that both ...
24 CitationsSource