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Search Publications by: Edward Garboczi (Assoc)

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Displaying 51 - 75 of 259

Microstructure Homogenization of Concrete Used in Nuclear Power Plants

December 31, 2020
Author(s)
Edward Garboczi, Christa Torrence, Zachary Grasley, Aishwarya Baranikumar, William Lawrimore
Nearly all nuclear power plants in the United States are operating past their intended lifetimes or are requesting lifetime extensions. Therefore, understanding changes to the concrete containment structure over time is crucial to evaluate the structure's

Designing 3D printable cementitious materials with gel-forming polymers

December 11, 2020
Author(s)
Edward Garboczi, Hajar Taheri Afarani, William carroll, Joseph J. Biernacki
Cement based pastes for 3D printing applications were prepared using hydrogel-forming polymers. Preliminary results suggest that such gel-forming polymers can reduce the need for more complex admixture packages as printing aids. The influence of polymer

AMB2018-03: Benchmark Physical Property Measurements for Material Extrusion Additive Manufacturing of Polycarbonate

October 29, 2020
Author(s)
Daniel P. Cole, Frank Gardea, Todd C. Henry, Jonathan Seppala, Edward Garboczi, Kalman D. Migler, Christopher M. Shumeyko, Jeffery R. Westrich, Sara Orski, Jeffery L. Gair
Material extrusion (MatEx) is finding increasing applications in additive manufacturing of thermoplastics due to the ease of use and the ability to process disparate polymers. Since part strength is anisotropic and frequently deviates negatively with

Characterization of 3-Dimensional Printing and Casting Materials for use in Computed Tomography and X-ray Imaging Phantoms

September 15, 2020
Author(s)
Bryan E. Yunker, Andrew Holmgren, Karl Stupic, J. L. Wagner, S Huddle, R Shandas, R. F. Weir, Katy Keenan, Edward Garboczi, Stephen E. Russek
Imaging phantoms are used to calibrate and validate the performance of medical computed tomography (CT) systems. Many new materials developed for three-dimensional (3D) printing processes may be useful in the direct printing or casting of biomimetic and

Temperature-induced heteroaggregation in polydisperse portlandite suspensions

August 17, 2020
Author(s)
Edward Garboczi, Gaurav Sant, Iman Mehdipour, Narayanan Neithalath, Mathieu Bauchy, Samanvaya Srivastava, Sharu Bhagavathi Kandy
Temperature is well-known to affect the aggregation behavior of colloidal suspensions. This paper elucidates the temperature dependence of the rheology of portlandite (calcium hydroxide: Ca(OH)2) suspensions that feature a high ionic strength and a pH

Modeling the Electromagnetic Scattering Characteristics of Carbon Nanotube Composites Characterized by 3D Tomographic Transmission Electron Microscopy

May 7, 2020
Author(s)
Ahmed M. Hassan, Md Khadimul Islam, Spencer On, Bharath Natarajan, Itai Stein, Noa Lachman, Estelle Cohen, Brian L. Wardle, Renu Sharma, James Liddle, Edward Garboczi
In nearly all prior modeling studies of the electromagnetic properties of carbon nanotube (CNT) composites, the three-dimensional (3D) shape and spatial distribution of the CNTs in the composite were unknown. Therefore, simplifying assumptions had to be

In situ fatigue monitoring investigation of additively manufactured maraging steel

April 17, 2020
Author(s)
Edward Garboczi, Todd Henry, Francis Phillips, Daniel Cole, Robert Haynes, Terrence Johnson
This work describes an experimental validation set for assessing the real-time fatigue behavior ofmetallic additive manufacturing (AM) maraging steel structures. Maraging steel AM beams were fabricated with laser powder bed fusion (LPBF) and characterized

Dispersing nanosized portlandite particulates via electrosteric exclusion at short screening lengths

March 16, 2020
Author(s)
Jason Timmons, Iman Mehdipour, Shang Gao, Hakan Atahan, Narayanan Neithalath, Mathieu Bauchy, Edward Garboczi, Samanvaya Srivastava, Gaurav Sant
In spite of their high surface charge (ζ = + 34 mV), aqueous suspensions of portlandite (calcium hydroxide: Ca(OH)2) exhibit a strong tendency to aggregate, and thereby present unstable suspensions. While a variety of commercial dispersants seek to modify

Outcomes and Conclusions from the 2018 AM-Bench Measurements, Challenge Problems, Modeling Submissions, and Conference

February 13, 2020
Author(s)
Lyle E. Levine, Brandon M. Lane, Jarred C. Heigel, Kalman D. Migler, Mark R. Stoudt, Thien Q. Phan, Richard E. Ricker, Maria Strantza, Michael R. Hill, Fan Zhang, Jonathan E. Seppala, Edward J. Garboczi, Erich D. Bain, Daniel Cole, Andrew J. Allen, Jason C. Fox, Carelyn E. Campbell
The Additive Manufacturing Benchmark Test Series (AM-Bench) was established to provide rigorous measurement test data for validating additive manufacturing (AM) simulations for a broad range of AM technologies and material systems. AM-Bench includes

Materials Characterization With Multiple Offset Reflects at Frequencies to 110 GHz

January 8, 2020
Author(s)
Nina P. Basta, Aaron Hagerstrom, Jasper A. Drisko, James Booth, Edward Garboczi, Christian Long, Nathan Orloff
Understanding the electrical properties of materials is a necessary part of any microwave circuit design. In this article, we explore the possibility of employing multiple-offset-reflect devices for on-wafer materials characterization at frequencies up to

Plasmonic Nano-antenna Optimization Using Characteristic Mode Analysis

January 3, 2020
Author(s)
Edward Garboczi, Sumitra Dey, Deb Chatterjee, Ahmed M. Hassan
Plasmonic nano-antennas are typically designed using RF-inspired parametric optimization process and/or using trial and error search algorithms which lack proper physical insight. In this study, we demonstrate how the Characteristic Mode Analysis (CMA)
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