Publicado 6 números por año
ISSN Imprimir: 1543-1649
ISSN En Línea: 1940-4352
Indexed in
SADDLE NODE SCALING ON APPROACH TO DISLOCATION NUCLEATION
SINOPSIS
We study the process of dislocation nucleation in aperfect 2D hexagonal crystal under nano-indentation loading in anumerical model using energy minimization techniques and analysisof the energy eigenmodes. The nucleation event takes the form ofa saddle-node catastrophe and is governed by associated scalinglaws In particular, on approach to nucleation, a single energyeigenmode descends through the spectrum and its eigenvaluevanishes as the square root of the distance to the nucleationpoint. The velocity of the system shows the same scalingbehavior, and its normal-mode decomposition demonstrates that itis dominated by the critical mode responsible for nucleation.
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