J191052 分子動力学法を用いた宇宙環境における微細粒金属内部の格子欠陥がもたらす力学特性変化の評価([J19105]構造・材料の高度化に向けた宇宙工学と材料力学の展開(5))

概要

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Considering space utilization of the fine-grained metals, we have investigated an influence of the nano-scale voids on mechanical behavior of Cu fine-grained metals based on molecular dynamics (MD) method. Focusing on the dislocation activity enhancement due to void growth, grain size and temperature dependence of the mechanical behavior change have been evaluated. MD simulations have shown the following results: (1) Dislocation activity around the void at the initial void growth stage has an influence on the change in yield stress. (2) Dislocation activity enhancement due to void growth during and after yielding conducts increased ductility by improved plastic deformability. (3) Amount of ductility enhancement is larger at low temperature than at room temperature.
一般社団法人日本機械学会の論文
2011-09-11