Regensburg 2004 – scientific programme

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M: Metallphysik

M 25: Mechanische Eigenschaften III

M 25.1: Talk

Thursday, March 11, 2004, 10:15–10:30, H4

Modelling modulus mismatch strengthening for dislocation dynamics simulations — •Volker Mohles — Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Modulus mismatch strengthening is investigated by simulating the glide of dislocations through obstacle fields and determining the critical resolved shear stress. For the interaction between dislocations and the modulus mismatched particles a heuristic stress function is assumed. This is necessary because a an accurate treatment is not known; moreover the computational effort for such a treatment would be too high at present. The heuristic stress function accounts for the interaction’s essential properties, like symmetry operations and the dependence on the magnitude of the Burgers vector. The coefficients of this function are to be adjusted to atomistic simulations (Embedded Atom Method, e.g. Nedelcu et al., Osetsky et al.).