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
#1Qing Lin (UMN: University of Minnesota)H-Index: 11
#2Joseph F. LabuzH-Index: 32
Last. Sara Cattaneo (Polytechnic University of Milan)H-Index: 15
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4 Citations
#1Nuri F. Ince (UMN: University of Minnesota)H-Index: 18
#2C. S. Kao (UMN: University of Minnesota)H-Index: 6
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
view all 5 authors...
This paper reports on the feasibility of locating microcracks using multiple-sensor measurements of the acoustic emissions (AEs) generated by crack inception and propagation. Microcrack localization has obvious application in non-destructive structural health monitoring. Experimental data was obtained by inducing the cracks in rock specimens during a surface instability test, which simulates failure near a free surface such as a tunnel wall. Results are presented on the pair-wise event correlati...
20 CitationsSource
#1Andrey V. Pyatigorets (UMN: University of Minnesota)H-Index: 5
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
Last. Henryk K. Stolarski (UMN: University of Minnesota)H-Index: 27
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A new approach is proposed for the experimental study of the effective shear modulus of porous elastic materials using the uniaxial tension test. The idea is to measure strains at a few points surrounding a cluster of holes that represents the structure of the material. The representative cluster is placed in the material with the same elastic properties as those of the matrix. The measured strains lead to the properties of the equivalent circular inhomogeneity, which would produce the same elas...
6 CitationsSource
#1Haiyan Li (UMN: University of Minnesota)H-Index: 12
#2Xiaofei Yun (Sichuan University)H-Index: 3
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract Objective This study aims to validate a cavity shape optimization approach for improving the debonding resistance of dental restorations by carrying out fracture tests on restored model teeth with standard and optimized cavity designs. Method The bio-mimetic stress-induced material transformation (SMT) optimization method was incorporated into the finite element (FE) program ABAQUS as a user material (UMAT) subroutine. The method uses stress minimization to optimize the cavity shape of ...
7 CitationsSource
#1G. S. Wachman (Polytechnic University of Milan)H-Index: 3
#2Luigi Biolzi (Polytechnic University of Milan)H-Index: 26
Last. Joseph F. LabuzH-Index: 32
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The stress field in a pile-supported 3.9-m-high embankment was interpreted through three-dimensional finite-element modeling, and evaluated by field measurements involving strain gauges on the piles and earth pressure cells at the top and bottom of a 0.9-m-thick geogrid-reinforced platform. Analyses of the numerical results and the experimental data suggest that a vaultlike arch developed within the embankment, such that the vertical stress at the top of the platform was concentrated above the p...
27 CitationsSource
#1Raul Velasquez (UMN: University of Minnesota)H-Index: 18
#2Mihai Marasteanu (UMN: University of Minnesota)H-Index: 33
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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ABSTRACT The majority of micromechanics models available in the literature to estimate effective properties of asphalt mixtures are based only on the mechanical properties and the volumetric fraction information of its constituents. However, significant improvements in the prediction of these models can be obtained if higher-order microstructural information provided by n-point correlation functions is included. This paper proposes a simplified algorithm to estimate the 2- and 3-point correlatio...
7 CitationsSource
#1Raul VelasquezH-Index: 18
#2Joseph F. LabuzH-Index: 32
Last. Adam Zofka (UConn: University of Connecticut)H-Index: 18
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Two methods are proposed to correct stresses measured with the thermal stress restrained specimen test (TSRST) due to specimen bending. The first method estimates the bending stress from the angle of rotation of the specimen by assuming the location of the axis of rotation in the center of the specimen and perpendicular to the line that connects the two displacement transducers of the TSRST system. Maximum stresses as function of temperature are calculated by superimposing the uniform axial stre...
11 CitationsSource
Apr 19, 2009 in ICASSP (International Conference on Acoustics, Speech, and Signal Processing)
#1Nuri F. Ince (UMN: University of Minnesota)H-Index: 18
#2C. S. Kao (UMN: University of Minnesota)H-Index: 6
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
view all 5 authors...
Localizing micro cracks in critical components is crucial in the field of continuous structural health monitoring. In this paper, we utilize several signal processing and machine learning techniques such as hierarchical clustering and support vector machines (SVM) to process multisensor acoustic emission (AE) data generated by the inception and propagation of cracks. We present preliminary laboratory results that explore the pairwise event correlation of AE waveforms generated in the process of ...
10 CitationsSource
#1Qing Lin (UMN: University of Minnesota)H-Index: 11
#2Ali Fakhimi (New Mexico Institute of Mining and Technology)H-Index: 18
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Initiation of failure under three-point bending was observed in sandstone specimens with and without a stress concentrator. Acoustic emission (AE) and electronic speckle pattern interferometry (ESPI) were used to quantify the fracture phenomena through AE locations and ESPI images of an intrinsic damage zone. To investigate mixed mode fracture, beam tests with off-center notches were studied as well. Before about 95% of peak load, the locations of AE were somewhat random for beams with a smooth ...
51 CitationsSource
#1Nuri F. InceH-Index: 18
#2C. S. KaoH-Index: 6
Last. Joseph F. LabuzH-Index: 32
view all 5 authors...
This paper presents a sequence of signal processing and hierarchical clustering techniques utilized to process signals with low signal-to-noise ratio (SNR) measured by multiple AE sensors. Noise and other extraneous events present major challenges for the detection and monitoring of AE signals generated by the inception of microcracks and their growth. Characteristics of AE waveforms released during controlled mode-I fracture are explored, and these characteristics are used for clustering AE and...
2 Citations