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18 results on '"Rhee, Moono"'

1. Self-similar solutions of shock propagation in particle composite materials: Scaling dependence on particle drag and percolation models.

Author

Quint, David A., Minich, Roger W., Herbold, Eric B., Rhee, Moono, Lind, Jonathan, Bober, David, and Kumar, Mukul

Subjects
COMPOSITE particles (Composite materials), PERCOLATION, LIE groups
Abstract

Self-similar solutions are solved for a shock propagation in a hydrodynamically coupled, two-phase media system using Lie group analysis. The composite media consists of a polymer matrix loaded with micron-sized spherical tungsten particles. Tuning both the particle diameter, Dp, and the particle volume fraction, ф0, we find that the self-similar solutions depend on the form of the particle drag law and the constitutive material behavior as the spherical particle percolation limit is approached. As a validation of the model we study the scaling behavior of the self-similar solutions for different values of the particle volume fraction and compare our analysis with experimental shock transit times for different tungsten loadings of the polymer matrix. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Stability of dislocation short-range reactions in BCC crystals

Author

Huang, Hanchen, Ghoniem, Nasr, Rubia, Tomas Diaz de la, Rhee, Moono, Zbib, Hussein, and Hirth, John

Subjects
Dislocations in crystals -- Research, Crystals -- Plastic properties, Deformations (Mechanics) -- Research, Science and technology
Abstract

Research was conducted to examine the stability of short-range reactions between two dislocations of parallel line vectors which glide on two parallel slip planes in BCC crystals. The elastic interaction between the two dislocations based on their stress fields at finite speed and the kinetic energy of moving dislocations resulting in inertial forces were two features that were highlighted in DD simulations. Results suggest that the dynamic formation of dislocation dipoles or tilt wall embryos takes place only over a small range of the phase space.

Published
1999

17. Using Supercomputers to Optimize Hot Rolling for the Steels of Tomorrow.

Author

Fisher, Aaron, Walton, Chris, Rhee, Moono, Vogl, Chris, and Nikitenko, Eugene

Subjects
HOT rolling, ROLLING (Metalwork), SUPERCOMPUTERS, LIGHTWEIGHT steel, INDUSTRIAL heating
Abstract

The article focuses on Lawrence Livermore National Laboratory (LLNL) and the U.S. Steel are working in partnership through the High-Performance Computing for Manufacturing (HPC4Mfg) program to apply high-performance computing (HPC), modeling and simulation to improve industrial operations and reduce waste at hot-strip mills. Topics include the creates targeted partnerships among competitively selected the U.S. manufacturers and a national lab or labs to solve intractable industrial problems.

Published
2021

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