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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.
Abrupt growth of displacement observed in the relationship between indent load and indent depth in nanoindentation of crystalline materials, so-called displacement burst, has been recognized as one of the representative examples of nanoscale plastic behavior (nanoplasticity). This phenomenon corresponds to the early stage of plastic deformation and is greatly influenced by the collective dislocation emission. In the present paper a simplified model is constructed for the first displacement burst with use of the elastic theory based on both the Hertzian contact theory and the classical dislocation theory to evaluate the displacement burst in nanoindentation. The result of the analytical model for the energy equilibrium revealed that there is a strong correlation between burst width and critical indent depth that corresponds to the dislocation emission. Finally, it is shown that more than one hundred high-density dislocations are generated simultaneously and surface step corresponding to the Burgers vector of dislocation dipole of each emitted dislocation causes significant displacement burst.
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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.
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.
Dislocation Nucleation and Interaction under Nanoindentation in Single Crystalline Al and Cu: Molecular Dynamics Simulations
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This study uses molecular dynamics simulations to investigate dislocation nucleation and interaction during nanoindentation of single-crystalline Al and Cu, providing atomic-scale insight into the displacement burst (pop-in) phenomenon.
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.
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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