Dislocation Dynamics in the Modified Frenkel-Kontorova Model

作者: Youn Young Earmme

DOI: 10.1063/1.324215

关键词: Frenkel–Kontorova modelShear modulusPerfect crystalLattice (order)Speed of soundMechanicsDislocation creepPhysicsCritical resolved shear stressPeierls stress

摘要: An analytical solution is presented for the atomic displacements in steady motion of a dislocation modified Frenkel‐Kontorova model. The phenomenon breakdown regular as velocity approaches speed sound, found by Earmme and Weiner same model γ=1/2 seen to exist this any γ<1/2, where γ measure critical shear stress perfect crystal, varying from zero one‐half units modulus. It that sufficiently low mode can which moves at high constant without exciting lattice waves with no applied required maintain motion. A thorough investigation (and large values γ<1/2) shows some range v unstable. Furthermore, it appears there does not steady‐state soluti...

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