Analytical estimation of dislocation distribution at the tip of arrested cracks
| Autor: | V. A. Kuranova, Yu. I. Tyalin, V. A. Fedorov, T. N. Pluzhnikova |
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| Rok vydání: | 2000 |
| Předmět: |
Materials science
Structure formation Crack tip opening displacement Slip (materials science) Mechanics Plasticity Physics::Classical Physics Condensed Matter Physics Crack growth resistance curve Physics::Geophysics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Slip line Crack closure Dislocation |
| Zdroj: | Physics of the Solid State. 42:1290-1293 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/1.1131379 |
| Popis: | Computer simulation technique is used for studying the plastic flow at the tip of an arrested crack in lithium fluoride crystals. Two stages of the dislocation structure formation at the tip of a crack are analyzed: the formation of slip lines at the instant of crack arresting, and their evolution after sample unloading and partial healing of the crack. The size and the number of dislocations in a slip line are determined as functions of the loading force at the instant of crack arresting and on frictional stresses. It is shown that, during sample unloading and healing, some dislocations emerge at the plane of the crack under the action of mutual repulsion and image forces, so that the dislocation density attains its maximum value at a distance from the crack tip. A finite region free of dislocations exists in the immediate vicinity of the crack tip. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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