Atomistic Simulations of Dislocation — Crack Interaction

  • Erik Bitzek
  • Peter Gumbsch
Conference paper

Summary

The interaction of dislocations with a static mode I crack is studied by large scale molecular dynamics simulations. The model consists of a blunted [001](110) crack in nickel, to which after relaxation at K < KIc the displacement field of a dislocation is added. The response of the system is monitored during its evolution in the micro-canonical ensemble. The three dimensional nature of the problem requires the simulation of many millions of atoms. The great demands on the computational resources and data storage can only be met by high performance computing platforms and by the development of appropriate simulation methods. The simulations allowed to identify different characteristic processes during the interaction of the impinging dislocation with the crack. In particular, stimulated dislocation emission and cross slip processes are observed to be important for the development of a plastic zone.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Erik Bitzek
    • 1
  • Peter Gumbsch
    • 1
    • 2
  1. 1.Institut für Zuverlässigkeit von Bauteilen und Systemen (izbs)Universität Karlsruhe (TH)KarlsruheGermany
  2. 2.Fraunhofer-Institut für Werkstoffmechanik IWMFreiburgGermany

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