ATOMISTIC/CONTINUUM SIMULATION OF INTERFACIAL FRACTURE PART Ⅱ:ATOMISTIC/DISLOCATION/CONTINUUM SIMULATION附视频

<正> Coupled atomistic/dislocation/continuum simulation of interfacialfracture is performed in this paper.The model consists of a nanoscopic core made byatomistic assembly and a surrounding elastic continuum with discrete dislocations.Atomistic dislocations nucleate from the crack tip and move to the continuum layerwhere they glide according to the dislocation dynamics curve.An atoms/continuumoverlapping belt is devised to facilitate the transition between the two scales.Thecontinuum constraint on the atomic assembly is imposed through the mechanics at-mosphere along the overlapping belt.Transmissions of mechanics parameters suchas displacements,stresses,masses and momenta across the belt are realized.Thepresent model allows us to explore interfacial fracture processes under different modemixity.The effect of atomistic zigzag interface on the fracture process is revealed:ithinders dislocation emission from the crack tip,especially under high mode mixity.