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187 results on '"Hand, Russell J."'

9. Glass structure and crystallization in boro-alumino-silicate glasses containing rare earth and transition metal cations: a US-UK collaborative program

Author

McCloy, John S., Marcial, José, Patil, Deepak, Saleh, Muad, Ahmadzadeh, Mostafa, Chen, Hua, Crum, Jarrod V., Riley, Brian J., Kamat, Hrishikesh, Bréhault, Antoine, Goel, Ashutosh, Barnsley, Kristian E., Hanna, John V., Rajbhandari, Prashant, Corkhill, Claire L., Hand, Russell J., and Hyatt, Neil C.

Published
2019
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11. Vibration analysis of cracked beam based on Reddy beam theory by finite element method.

Author

Taima, Moustafa S, El-Sayed, Tamer A, Shehab, Mohamed B, Farghaly, Said H, and Hand, Russell J

Subjects
FINITE element method, TIMOSHENKO beam theory, MODE shapes, DEGREES of freedom, STEEL analysis
Abstract

The lateral vibration of cracked isotropic thick beams is investigated. Generally, the analysis of thick beam based on line elements can be undertaken using either Timoshenko beam theory or a third order beam theory (TSDT) such as Reddy beam theory. TSDT is superior to Timoshenko beam theory, as it eliminates the need for a shear correction coefficient. However, there is no available solution for a cracked beam based on Reddy beam theory which is the main focus of this paper. The investigated beam is divided into several elements where their stiffness and mass matrices are derived using Reddy beam theory. Each element has two nodes with 3 degrees of freedom (1 lateral and 2 rotational) at each node. The crack was modeled using two rotating springs with stiffnesses that varied with crack depth. These elements are used to connect the adjacent beam elements. The impact of boundary conditions, slenderness ratio, crack location, and crack depth are investigated. In addition, experimental and finite element analyses of cracked steel beams is undertaken to validate the results of the present model. The results show that the maximum deviation between the analytical and the experimental results is less than 3% up to the third mode shape. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Micro- and Nanoscale Surface Analysis of Late Iron Age Glass from Broborg, a Vitrified Swedish Hillfort

Author

Matthews, Bethany E, primary, Neeway, James J, additional, Farias, Lorena Nava, additional, Marcial, José, additional, Arey, Bruce W, additional, Soltis, Jennifer, additional, Kovarik, Libor, additional, Zhu, Zihua, additional, Schweiger, Michael J, additional, Canfield, Nathan, additional, Varga, Tamas, additional, Bowden, Mark E, additional, Weaver, Jamie L, additional, McCloy, John S, additional, Sjöblom, Rolf, additional, Hjärthner-Holdar, Eva, additional, Englund, Mia, additional, Ogenhall, Erik, additional, Vicenzi, Edward P, additional, Corkhill, Claire L, additional, Thorpe, Clare, additional, Hand, Russell J, additional, Peeler, David K, additional, Pearce, Carolyn I, additional, and Kruger, Albert A, additional

Published
2023
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15. Physical and optical properties of the International Simple Glass

Author

Kaspar, Tiffany C., Ryan, Joseph V., Pantano, Carlo G., Rice, Jarrett, Trivelpiece, Cory, Hyatt, Neil C., Corkhill, Claire L., Mann, Colleen, Hand, Russell J., Kirkham, Michael A., Crawford, Charles L., Jantzen, Carol M., Du, Jincheng, Lu, Xiaonan, Harrison, Michael T., Cushman, Cody, Linford, Matthew R., and Smith, Nicholas J.

Published
2019
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18. Effect of network connectivity on behavior of synthetic Broborg hillfort glasses

Author

Marcial, José, primary, Cicconi, Maria Rita, additional, Pearce, Carolyn I., additional, Kloužek, Jaroslav, additional, Neeway, James J., additional, Pokorný, Richard, additional, Vernerová, Miroslava, additional, McCloy, John S., additional, Nienhuis, Emily T., additional, Sjöblom, Rolf, additional, Weaver, Jamie L., additional, Hand, Russell J., additional, Hrma, Pavel, additional, Neuville, Daniel R., additional, and Kruger, Albert A., additional

Published
2022
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23. Effect of network connectivity on behavior of synthetic Broborg hillfort glasses.

Author

Marcial, José, Cicconi, Maria Rita, Pearce, Carolyn I., Kloužek, Jaroslav, Neeway, James J., Pokorný, Richard, Vernerová, Miroslava, McCloy, John S., Nienhuis, Emily T., Sjöblom, Rolf, Weaver, Jamie L., Hand, Russell J., Hrma, Pavel, Neuville, Daniel R., and Kruger, Albert A.

Subjects
FOAM, GLASS transition temperature, GLASS waste, RADIOACTIVE wastes, IRON oxidation, GLASS
Abstract

There is wide industrial interest in developing robust models of long‐term (>100 years) glass durability. Archeological glass analogs, glasses of similar composition, and alteration conditions to those being tested for durability can be used to evaluate and inform such models. Two such analog glasses from a 1500‐year‐old vitrified hillfort near Uppsala, Sweden have previously been identified as potential analogs for low concentration Fe‐bearing aluminosilicate nuclear waste glasses. However, open questions remain regarding the melting environment from which these historic glasses were formed and the effect of these conditions on their chemical durability. A key factor to answering the previous melting and durability questions is the redox state of Fe in the starting and final materials. Past work has shown that the melting conditions of a glass‐forming melt may influence the redox ratio value (Fe+3/∑Fe), a measure of a glass's redox state, and both melting conditions and the redox ratio may influence the glass alteration behavior. Synthetic analogs of the hillfort glasses have been produced using either fully oxidized or reduced Fe precursors to address this question. In this study, the melting behavior, glass transition temperature, oxidation state, network structure, and chemical durability of these synthesized glass analogs is presented. Resulting data suggests that the degree of network connectivity as impacted by the oxidation state of iron impacted the behavior of the glass‐forming melt but in this case does not affect the chemical durability of the final glass. Glasses with a lower degree of melt connectivity were found to have a lower viscosity, resulting in a lower glass transition temperature and softening temperature, as well as in a lower temperature of foam onset and temperature of foam maximum. This lower degree of network connectivity most likely played a more significant role in accelerating the conversion of batch chemicals into glass than the presence of water vapor in the furnace's atmosphere. Future work will focus on using the results from this work with outcomes from other aspects of this project to evaluate long‐term glass alteration models. [ABSTRACT FROM AUTHOR]

Published
2023
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