Threshold crack speed controls dynamical fracture of silicon single crystals.

@article{Buehler2007ThresholdCS,
  title={Threshold crack speed controls dynamical fracture of silicon single crystals.},
  author={Markus J Buehler and Harvey Tang and Adri C T van Duin and William A. Goddard},
  journal={Physical review letters},
  year={2007},
  volume={99 16},
  pages={165502}
}
Fracture experiments of single silicon crystals reveal that after the critical fracture load is reached, the crack speed jumps from zero to approximately 2 km/sec, indicating that crack motion at lower speeds is forbidden. This contradicts classical continuum fracture theories predicting a continuously increasing crack speed with increasing load. Here we show that this threshold crack speed may be due to a localized phase transformation of the silicon lattice from 6-membered rings to a 5-7… CONTINUE READING
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