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Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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2017 An Evaluation of Nanoindentation-Induced Displacement Burst and Collective Dislocation Motion Based on Discrete Dislocation Mechanics and Elastic Energy of Dislocations
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Researchers built computational models to explain the "displacement burst" — a sudden jump in material deformation during nanoindentation — as arising from the collective emission of dislocations in crystalline materials. This work improves understanding of the earliest stages of plastic deformation at the nanoscale.
Theoretical Investigation of the Displacement Burst Observed in Nanoindentation by Collective Dislocation Loops Nucleation Model
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A simplified theoretical model is presented to predict the first "displacement burst" seen during nanoindentation of crystals, treating it as the collective nucleation of dislocation loops. The model provides a quantitative framework for interpreting nanoplastic behavior in pristine crystalline materials.
Theoretical Investigation of the Displacement Burst Observed in Nanoindentation by Collective Dislocation Loops Nucleation Model
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This study theoretically investigates the displacement burst (pop-in) observed in nanoindentation of crystalline materials using a collective dislocation loop nucleation model, modeling the early-stage plastic deformation that occurs after homogeneous elastic loading.
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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The crystallographic dependence of displacement burst behavior — abrupt plastic deformation events during nanoindentation — was characterized in single-crystal aluminum and copper with three surface orientations. The results show that the critical indent load for the first displacement burst depends strongly on crystal surface orientation, reflecting the underlying dislocation nucleation mechanisms.
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Molecular dynamics simulations of nanoindentation in single-crystal aluminum and copper were used to analyze how dislocations nucleate and interact beneath an indenter tip, finding critical stress thresholds for the transition from elastic to plastic behavior at the nanoscale. These results advance understanding of nano-plasticity relevant to ultra-small mechanical contacts and MEMS devices.
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