Modeling and simulation of mechanochemical processes in a rotational diamond anvil cellV. I. Levitas and O. M. Zarechnyy
Iowa State University, Departments of Mechanical Engineering, Aerospace Engineering, and Material Science and Engineering - Ames, IA 50011, USA
received 26 May 2009; accepted in final form 25 September 2009; published October 2009
published online 23 October 2009
Strain-induced structural changes (SCs), which include chemical reactions (CRs) and phase transitions (PTs), are studied here numerically under compression and torsion of a sample in a rotational diamond anvil cell (RDAC). The results change the fundamental understanding of the interpretation of experimentally observed effects and measurements and the extraction of information on material behavior from system (sample) behavior. These effects include the nontrivial, nonlinear interaction between strongly heterogeneous stress and plastic strain tensor fields and SC kinetics, the effect of change of material strength during SC, the simultaneous occurrence of direct and reverse SCs in different regions, strong strain localization, and pressure self-multiplication.
64.60.-i - General studies of phase transitions.
© EPLA 2009