109 分子動力学法によるナノスケール空隙のき裂進展抑止効果の評価(OS1-(3)オーガナイズドセッション《計算力学と数値シミュレーション》)

概要

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It is known that there exist various types of lattice defects in the reactor and/or aerospace materials due to long-term irradiation process. It is generally considered that these lattice defects cause the deterioration of materials. However, some atomistic simulations show that the nano-scale void acts as dislocation absorption and formation during deformation. The nano-scale void enhances dislocation activity and plastic deformation behavior becomes smooth, which means a crack growth may be deterred by the purposely introduced nano-scale voids in the vicinity of crack. However, experimental trial for the optimum nano-scale void arrangement is not realistic from a convenience and safety standpoint. We investigate this retardation effect by using a large scale parallel molecular dynamics (MD) method. MD simulation shows that a nano-scale void in the vicinity of a crack has a crack growth retardation effect due to a smoother plastic deformation mechanism.
2010-08-27