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Toy nanoindentation model and incipient plasticity

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Plans, I. y Carpio, Ana y Bonilla, L.L. (2009) Toy nanoindentation model and incipient plasticity. Chaos, Solitons and Fractals, 42 (3). pp. 1623-1630. ISSN 0960-0779

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URL Oficial: http://www.sciencedirect.com/science/article/pii/S0960077909001477



Resumen

A toy model of two dimensional nanoindentation in finite crystals is proposed. The crystal is described by periodized discrete elasticity whereas the indenter is a rigid strain field of triangular shape representing a hard knife-like indenter. Analysis of the model shows that there are a number of discontinuities in the load vs penetration depth plot which correspond to the creation of dislocation loops. The stress vs depth bifurcation diagram of the model reveals multistable stationary solutions that appear as the dislocation-free branch of solutions develops turning points for increasing stress. Dynamical simulations show that an increment of the applied load leads to nucleation of dislocation loops below the nanoindenter tip. Such dislocations travel inside the bulk of the crystal and accommodate at a certain depth in the sample. In agreement with experiments, hysteresis is observed if the stress is decreased after the first dislocation loop is created. Critical stress values for loop creation and their final location at equilibrium are calculated.


Tipo de documento:Artículo
Palabras clave:Dislocation nucleation; Fricton; Detachment; Fracture; Crystals
Materias:Ciencias > Física > Física de materiales
Código ID:14901
Depositado:19 Abr 2012 09:19
Última Modificación:28 Oct 2016 08:32

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