Mathematical Modeling of Dislocation Behavior and Its Application to Crystal Plasticity Analysis

Tetsuya Ohashi was born in Sapporo, Japan in 1951.  He received ME and Ph.D. degrees in mechanical engineering from Hokkaido University in 1976 and 1981, respectively.  He joined Hitachi Ltd in 1981 and has been engaged in research on the modeling and numerical simulation of deformations and lattice defect accumulation in metallic and semiconductor materials.  In 1997, he joined National Research Institute for Metals and in 1999 he moved to Kitami Institute of Technology.  In 2019 he joined National Institute for Materials Science as an advisor for a national project of "element strategy initiative for structural materials".  Throughout his carrier, he has been engaged in research on the slip deformation in metal microstructures and dislocations’ behavior in them.

• Introduction.- Plastic shear strain associated with dislocation movement.- Dislocation accumulation due to plastic slip.- Statistically stored dislocations, mean free path of dislocations and recovery due to thermal effects.- Model of critical shear stress.- Work done by slip deformation and equivalent plastic strain.- Generation of atomic vacancies by dislocation pair annihilation.- Scheme of crystal plasticity finite element analysis.- Some numerical examples.- Acknowledgements.- References.