分子動力学法によるbcc結晶中のモードI型き裂先端からの転位の発生と運動

概要

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Tne atomic scale deformation near the crack-tip field in bcc crystal under anti-twining in-plane shear (Mode II ) loading is analyzed by means of molecular dynamics (MD). The appearance and movement of dislocations on (112)-plane whose Burgers' vector b=[111]/2 are observed. The critical stress intensity factor (KII^^<cr>) obtained from the analysis of the edge dislocation observed at the crack tip does not depend on the condition of analysis, and agrees well with the Rice's standard value of KII^^cr. The experimental expression for the relationship between the velocity of dislocation νd and τ, which was proposed in our previous report, is applied to the numerical calculation of the motion of dislocation in stress field which is evaluated by considering the interaction between crack and dislocation with linear elasticity. The results of the numerical calculation agree with those of MD simulation.
社団法人日本材料学会の論文
1997-06-15