PS19 離散転位動力学に基づく転位組織の力学的不安定性クライテリオンの提案とその適用(フェロー賞対象ポスターセッション)

概要

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To understand the nature of mechanical instabilities of dislocation structures, e.g., veins and persistent slip bands (PSBs), as an origin of fatigue or plastic behavior in metals, it is essential to evaluate a critical mechanical condition where a dislocation structure collapses. In this paper, we developed an analytical method to describe the instability criterion for arbitrary dislocation structures based on the discrete dislocation dynamics (DDD) concept. According to the proposed method, the mechanical instability starts when the minimum eigenvalue of Hessian matrix of the potential energy reaches zero. We applied the method to veins with the Taylor-Nabarro lattices under external loading, and it can successfully describe the onset of instability. The success enables us to address mechanical instability issues on more complicated dislocation structures.
2010-10-09