一次要素を用いた原子構造体の効率的不安定性解析手法の開発とアモルファス金属への適用

摘要

For atomic-level investigation of plasticity in amorphous metal, instability analysis which can rigorously describe unstable deformation of atomic structures is a key technique. However, the analytical method cannot be applied to large-scale amorphous metal because of the enormously-increasing computational load with respect to the number of atoms. In this study, an efficient instability analysis method for a large-scale atomic system is proposed using linear elements, and it is applied to cracked amorphous metal under tension. The proposed method successfully evaluates the instability criterion as well as the highly-localized unstable deformation. Moreover, the computational efficiency is considerably improved from the original one, enabling us to address mechanical instability problems in amorphous metal consisting of a great number of atoms.%近年，比較的低い冷却速度でも容易にアモルファスrn化する金属ガラスが見い出されたことでバルク状rnのアモルファス金属の作製が可能になり，構造材料へrnの適用が期待されている．rnさて，結晶金属では，一般に規則正しい原子配列をrn乱す転位の増殖・運動によるすべり帯が材料の巨視的rnな塑性変形を支配している．