Abstract
Simulations of dislocations nucleation and glide ahead of a crystallographic mode II crack are performed for push-pull and reversed torsion. An influence of the normal stress on the friction of crack flanks, as well as on the condition for dislocation emission is introduced. The crack growth rates are deduced from the dislocation fluxes at the crack tip. A comparison between the loading modes is made. Taking into account the presence of grain boundaries, the repeated decelerations and sometimes the arrest that characterize Stage I crack growth are described by the model. An analysis of the transition from mode I to mode II crack growth observed at low ΔKI in single crystals is proposed.
| Original language | English |
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| Pages (from-to) | Pr6-145-Pr6-150 |
| Journal | Journal De Physique. IV : JP |
| Volume | 10 |
| Issue number | 6 |
| Publication status | Published - 1 Jan 2000 |
| Externally published | Yes |
| Event | JFMSS-6: 6th Japan-France Materials Science Seminar 'Microstructural Design for Improved Mechanical Bahaviour of Advanced Materials' - Poitiers, France Duration: 4 Oct 1999 → 6 Oct 1999 |