HR: 1340h
AN: MR43B-1231    [Abstracts]
TI: Dynamic loading of silica glass: elasticity, plasticity, fracture, and phase changes
AU: Xie, Y
AF: University of Science and Technology of China, University of Science and Technology of China, Hefei, Anhui, Hefei, Anh 230026, China
AU: An, Q
AF: University of Science and Technology of China, University of Science and Technology of China, Hefei, Anhui, Hefei, Anh 230026, China
AU: An, Q
AF: California Institute of Technology, 1200 E. Calfornia Blvd., Pasadena, CA 91125, United States
AU: Han, L B
AF: University of Science and Technology of China, University of Science and Technology of China, Hefei, Anhui, Hefei, Anh 230026, China
AU: Zheng, L Q
AF: Florida State University, Florida State University, Tallahassee, FL 32306, United States
AU: Xia, K
AF: University of Toronto, University of Toronto, Toronto, ON ON M5S 1A4, Canada
AU: Tschauner, O
AF: University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV 89154, United States
AU: * Luo, S N
EM: sluo@lanl.gov
AF: Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, NM 10504, United States
AB: We investigate the mechanical and physical properties of silica glass under high strain rate dynamic loading using molecular dynamics simulations. Several loading methods are explored: planar and spherical shock waves, as well as one- and trhee-dimensional loading at constant strain rates. Elastic and plastic deformation is examined as function of both, strain rate and initial temperature. Fragmentation and spall processes are quantified and linked to classical nucleation theory and the Grady damage law. The rich phenomena of phase changes occurring under loading and unloading are examined. Silica structures are analyzed in terms of RDF, structure factors, density of states, ring size, and bond angle distributions.
DE: 0560 Numerical solutions (4255)
DE: 3924 High-pressure behavior
DE: 3944 Shock wave experiments
DE: 6022 Impact phenomena (5420, 8136)
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting