J. Phys. IV France 106 (2003) 3
Elementary mechanisms of brittle and semi-brittle fractureP. Gumbsch1, 2
1 Fraunhofer lnstitute for Mechanics of Materials (IWM), Wöhlerstrasse 11, 79108 Freiburg, Germany
2 University of Karlsruhe, Institute for Reliability of Componenfs and Systems (izbs), Kaiserstrasse 12, Geb. 10.91, 76131 Karlsruhe, Germany
Advances in Our understanding of the mechanisms of brittle and semi-brittle fracture processes are often made by direct comparison of microscopic modeling and carefully designed experiments. In this paper, examples are taken from ab-initio simulations and empirical atomistic modeling of brittle fracture which show that the production of metastable fracture surfaces or directional cleavage anisotropy are readily anticipated consequences of the discrete nature of the bond breaking at the crack tip. Both phenomena have been reported from fracture experiments on Silicon single crystals.
© EDP Sciences 2003