Understanding and Predicting Dynamic Behavior of Materials : Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS Structural Materials Division, TMS: Computational Materials Science and Engineering Committee, TMS: Mechanical Behavior of Materials Committee
Program Organizers: Saryu Fensin, Los Alamos National Laboratory; Avinash Dongare, University of Connecticut; Benjamin Morrow, Los Alamos National Laboratory; Marc Meyers, University of California-San Diego; George Gray, Los Alamos National Laboratory

Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr


G-29: Laser Induced Shock Compression of Covalently Bonded Planetary Materials: Boya Li1; 1University of California, San Deigo
    Olivine, forsterite and perovskite are the most abundant minerals in the Earth's mantle. Laser shock and isentropic compression on these covalently bonded planetary materials can be implemented to simulate the extreme regimes of high strain rates and pressures of the Earth’s interior. When a shock wave passes through a crystalline solid, the material is compressed while plastic deformation takes place. In ductile materials, this process is operated by dislocations, twinning and phase transformations as the strain rate increases. For some brittle materials, the defect-mediated plasticity is so limited that fracture failure may occur. A new mechanism of solid state amorphization as a deformation process has been proposed when the duration of the stress wave is orders of magnitude shorter than the required time for fracture, which has been observed in several covalent materials under shock compression.

G-30: Iron Response in Extreme Compression and Tension Regimes: Complementary NIF and Janus Experiments: Gaia Righi1; 1University of California, San Diego
    Iron is the major component of the Earth’s solid inner core, so determining its strength under extreme conditions is crucial to understand the rheology of Earth’s core and to interpret geophysical observations. Although it has been widely accepted that the body centered cubic Fe will go through at least one, possibly more, phase transitions at high pressures, the influence of such a reversible phase transition on the strength of Fe is still unknown. Molecular Dynamics simulations of shock-compressed single crystal bcc iron show that the newly formed epsilon phase is nanocrystalline. Reaching the theoretical strength has been a long standing but unreached goal and would have enormous value in developing next generation structural materials. Additionally, these results will lead to an improved understanding of asteroid impact dynamics, planetary formation dynamics, and interior structures of the earth, planets and exoplanets.