Mobility Laws in Dislocation Dynamics Simulations

Journal Article · Tue Oct 21 04:00:00 EDT 2003 · Materials Science and Engineering

OSTI ID:15014637

Cai, W; Bulatov, V V

Prediction of the plastic deformation behavior of single crystals based on the collective dynamics of dislocations has been a challenge for computational materials science for a number of years. The difficulty lies in the inability of existing dislocation dynamics (DD) codes to handle a sufficiently large number of dislocation lines, to establish a statistically representative model of crystal plasticity. A new massively-parallel DD code is developed that is capable of modeling million-dislocation systems by employing thousands of processors. We discuss an important ingredient of this code--the mobility laws dictating the behavior of individual dislocations. They are materials input for DD simulations and are constructed based on the understanding of dislocation motion at the atomistic level.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15014637
• Report Number(s): UCRL-JRNL-200968
• Journal Information: Materials Science and Engineering, Journal Name: Materials Science and Engineering Vol. 387-389; ISSN MSCEAA; ISSN 0025-5416
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
DISLOCATIONS
MONOCRYSTALS
PLASTICITY
PLASTICS
SIMULATION