材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
単結晶材料におけるモードI き裂の断続的な進展ダイナミクス
新山 友暁下川 智嗣藤元 大志
著者情報
ジャーナル フリー

2018 年 67 巻 2 号 p. 222-228

詳細
抄録

Discontinuous propagation of a crack tip in heterogeneous media is characterized by a power-law distribution, but discontinuity of crack propagation in homogeneous media is still unclear. In this study, we investigate the discontinuous features of the mode-I crack propagation in single crystals by performing molecular dynamics simulations of uniaxial tensile deformation for a two-dimensional single crystal model with an open cleavage. Temporal dynamics of the crack propagation is extracted by locating the position of the crack tip in the model. In the simulations, discontinuous crack propagation, go-stop motions of crack propagation, has been observed. The displacement of the crack seems to follow an exponential distribution depending on the temperature rather than power-law distributions. The observation indicates that the discontinuous behavior is due to dislocation emissions; a crack propagation started by increasing of local stress due to external loading stops by decreasing of the stress due to dislocation emission from the crack tip. This picture directly provides an exponential distribution consistent with the observed statistical feature.

著者関連情報
© 2018 日本材料学会
前の記事 次の記事
feedback
Top