Volume 87, Number 6, September 2009
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||12 October 2009|
Crack front propagation by kink formation
Institut für Theoretische und Angewandte Physik, Universität Stuttgart Pfaffenwaldring 57, 70550 Stuttgart, Germany, EU
Corresponding author: firstname.lastname@example.org
Accepted: 14 September 2009
The fracture of a three-dimensional brittle solid generates two-dimensional surfaces, which are formed behind a one-dimensional crack front. For quasi-static cracks on a (111) cleavage plane in silicon front propagation by kink-pair formation was proposed and proven by a reaction pathway analysis with Stillinger-Weber potentials. Here, we demonstrate that the kink-pair mechanism is much more general: we also observe it in molecular-dynamics simulations of a complex metallic alloy, the C15 NbCr2 Friauf-Laves phase, where we applied carefully selected embedded-atom-method potentials. The numerical experiments highlight that kink formation is essential for crack propagation in any brittle material.
PACS: 62.20.mj – Brittleness / 61.72.-y – Defects and impurities in crystals; microstructure / 02.70.Ns – Molecular dynamics and particle methods
© EPLA, 2009
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