Evaluation of MD-Aided Parameter in Fracture Mechanics.

Inoue Hideyuki, Akahoshi Yasuhiro, Harada Shoji

doi:10.1299/kikaia.60.2236

Bibliographic Information

Other Title

分子動力学法援用による破壊記述パラメータ
ブンシドウリキガクホウエンヨウニヨルハカイキジュツパラメータ

Search this article

Abstract

A molecular dynamics parameter (MDP), which J-integral is expanded to, is proposed for a molecular dynamics (MD) fracture simulation and is applied to a two-dimensional α-iron problem under simple tension. For this model a pair potential described by a polynomial expression is chosen as an interatomic potential. Closely packed lattice structures are assumed in the present calculation. The edge crack arranged in the middle of the analysis body is perpendicular to the tensile loading direction. The brittle fracture is analyzed under the fixed displacement boundary condition in the tensile deformation process. MDP₁ is calculated on several paths similarly to J-integral. MDP₁ increases slowly before fracture and decreases steeply after that in any path. In order to investigate the validity of MDP₁ the critical stress intensity factor K^MDP_IC is calculated. K^MDP_IC corresponds well with the decelis and Mullins K_IC. MDP value can be applied to an estimation of the initial stage of macroscopic fracture phenomenon with high reliability.

Journal

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 60 (578), 2236-2241, 1994

The Japan Society of Mechanical Engineers

Keywords

Details 詳細情報について

Export