Numerical study on universality of critical behavior in solid plasticity with different deformation mechanisms

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K03783
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
• Research Institution: Kanazawa University
• Principal Investigator: Niiyama Tomoaki 金沢大学, 機械工学系, 准教授 (00583858)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 塑性変形 / 自己組織化臨界現象 / 結晶 / アモルファス固体 / 分子動力学シミュレーション

Outline of Final Research Achievements

To understand the plasticity in solids from the viewpoint of nonequilibrium critical behaviors, we conducted molecular dynamics simulations of two-dimensional solids with different elementary deformation processes. The simulations resulted in plastic behaviors with fragile and ductile features. The critical behavior characterized by power-law distributions of plastic deformation was obtained. The typical feature of the distributions, almost independent of the structures and mechanical properties, does not indicate apparent diversity in the plastic behavior obtained in the simulations.

Free Research Field

非線形物理学，非平衡物理学，材料科学

Academic Significance and Societal Importance of the Research Achievements

本課題で注目する臨界的な挙動は，固体塑性においては突発的に大規模な変形が発生することに対応する。これは，不規則構造固体においては突発的な変形集中による脆性破壊を誘引する。このことから本課題の結果は，金属結晶やガラス・アモルファス固体の延性・脆性の理解し，突発的な破壊の抑制につながることが期待される。また，非平衡臨界挙動と材料機械特性の両学術領域間で，各分野で培われた知見の相互作用と発展が促進されるであろう。