Search Results - "Popovics, J. S."

Direct imaging of moisture effects during slow dynamic nonlinearity by Bittner, J. A., Popovics, J. S.

“…Transient hysteretic dynamic behaviors, commonly known as slow dynamics, have been observed to exist in many materials, but a physical cause for the phenomena…”
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Improved ultrasonic wave reflection technique to monitor the setting of cement-based materials by Öztürk, T., Kroggel, O., Grübl, P., Popovics, J.S.

“…A test setup using the ultrasonic wave reflection technique is used to monitor the hydration process of early-age cement-based materials throughout their…”
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Crack Propagation in Flexural Fatigue of Concrete by Kolluru, Subramaniam V, O'Neil, Edward F, Popovics, John S, Shah, Surendra P

“…In this paper the behavior of concrete subjected to flexural fatigue loading is studied. Notched concrete beams were tested in a three-point bending…”
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Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors by ZHU, J, POPOVICS, J. S

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Mechanistic diffusion model for slow dynamic behavior in materials by Bittner, J.A., Popovics, J.S.

“…•The Mechanistic Diffusion Model provides deeper understanding of transient slow dynamic nonlinear behaviors.•Conditioning and recovery periods of slow…”
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Non-classical nonlinear feature extraction from standard resonance vibration data for damage detection by Eiras, J N, Monzó, J, Payá, J, Kundu, T, Popovics, J S

“…Dynamic non-classical nonlinear analyses show promise for improved damage diagnostics in materials that exhibit such structure at the mesoscale, such as…”
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One-Sided Stress Wave Velocity Measurement in Concrete by Popovics, J. S, Song, W, Achenbach, J. D, Lee, J. H, Andre, R. F

“…Measurement of the velocity of stress waves in concrete provides valuable information on the state of the material. Recently, a number of papers have been…”
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Extent of Healing of Cracked Normal Strength Concrete by Aldea, Corina-Maria, Song, Won-Joon, Popovics, John S, Shah, Surendra P

“…The goal of the research presented here is to investigate the extent of healing of cracked concrete. A feedback-controlled test was used to generate a crack…”
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Effects of Poisson's Ratio on Impact-Echo Test Analysis by Popovics, John S

“…Although the Poisson's ratio of concrete is known to vary within a significant range of values, the resulting effects on impact-echo test results have not been…”
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Nondestructive Evaluation of Crack Depth in Concrete Using PCA-compressed Wave Transmission Function and Neural Networks by Shin, S. W., Yun, C. B., Futura, H., Popovics, J. S.

“…Cracks in concrete are common defects that may enable rapid deterioration and failure of structures. Determination of a crack’s depth using surface wave…”
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A survey of developments in ultrasonic NDE of concrete by Popovics, J.S., Rose, J.L.

“…The goal of this paper is to develop an understanding of the current state of ultrasonic nondestructive evaluation in the concrete community. Methods…”
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Testing Concrete in Torsion: Instability Analysis and Experiments by Subramaniam, Kolluru V, Popovics, John S, Shah, Surendra P

“…Torsion tests have been used to evaluate the shear response of concrete. The complete load-deformation response of unnotched concrete specimens subjected to…”
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Non-contact imaging for surface-opening cracks in concrete with air-coupled sensors by Zhu, J, Popovics, J S

“…Rapid and accurate non-destructive evaluation (NDE) techniques are needed to assess the in-place condition of concrete structures. However the time and effort…”
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An approach for wave velocity measurement in solid cylindrical rods subjected to elastic impact by Popovics, J.S., Rose, J.L.

“…Certain cross-sectional resonances of a long, solid, cylindrical rod, excited by transverse, elastic impact loading, may be measured by an experimental…”
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Special issue on Nondestructive Testing in Civil Engineering by Popovics, J. S.

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Ultrasonic pulse velocity test of concrete properties as specified in various standards by Komlos̆, K., Popovics, S., Nürnbergerová, T., Babál, B., Popovics, J.S.

“…This is a review paper comparing critically eight standards. Methods for the determination of longitudinal pulse velocity and assessment of concrete properties…”
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Approaches for the generation of stress waves in concrete by POPOVICS, J. S, ROSE, J. L, POPOVICS, S, NEWHOUSE, V. L, LEWIN, P, BILGUTAY, N

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Nondestructive Evaluation: Past, Present, and Future by Popovics, John S

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Fatigue Fracture of Concrete Subjected to Biaxial Stresses in the Tensile C-T Region by Subramaniam, Kolluru V, Popovics, John S, Shah, Surendra P

“…In this paper cyclic quasi-static and constant amplitude fatigue responses of concrete subjected tensile compression-tension (C-T) biaxial stress are…”
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Imaging Concrete Structures Using Air-Coupled Impact-Echo by Zhu, Jinying, Popovics, John S

“…In this paper, air-coupled impact-echo is successfully applied for nondestructive evaluation of concrete. The air-coupled sensor is a small ( 6.3 mm diameter)…”
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