Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 8: Intermetallic Phases II
MM 8.2: Talk
Monday, March 22, 2010, 11:45–12:00, H5
Crack front propagation by kink formation — •Frohmut Rösch and Hans-Rainer Trebin — Universität Stuttgart, Institut für Theoretische und Angewandte Physik, 70550 Stuttgart
In a brittle material a travelling crack generates an upper and a lower fracture surface, which meet at a one-dimensional crack front. From a macroscopic point of view there is no reason why this curve should deviate from a straight line, contrary to the atomistic point of view, where a crack propagates by successive rupture of cohesive bonds.
We investigate fracture of the C15 NbCr2 Friauf-Laves phase on an atomic level by means of molecular dynamics simulations. The numerical experiments highlight that crack fronts in general do not form a straight line and propagate by kink-pair formation at low loads (EPL 87 (2009) 66004). This mechanism should be relevant for crack propagation in any ordered brittle solid.