分子動力学法を用いた異種接合材の界面き裂先端近傍の変形と破壊の解析(<小特集>材料のミクロ・メゾ評価)

概要

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Elastic analyses near a tip of interface crack between dissimilar solids have shown that non-self-similar singularity develops and an overlapping of the crack surfaces may occur near the crack tip. In the present paper microscopic deformation and fracture near the tip of an interface crack were simulated by applying the molecular dynamics. Size effect was found in the near-tip deformation of geometrically similar cracks subjected to remote tension. The effect can be explained in terms of local stress intensity factor defined using an atomic spacing as a representative length. The direction of fracture depended on the local stress intensity factor and the interfacial strength. Locally pure opening mode and pure shearing mode were defined based on the local stress intensity factor. Deformation and fracture were simulated for these modes. The critical energy release rate under the pure opening mode was comparable with that calculated using the atomic potential. In the so-called overlapping region slipping developed along crack surface and the fracture occurred almost perpendicular to the crack surface.
社団法人日本機械学会の論文
1999-03-25