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Multiscale Modeling of Three Dimensional Discrete Dislocation Dynamics and Boundary Element Method and Its Application to Nanoindentation Problem
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This study develops a multiscale model coupling 3D discrete dislocation dynamics with the boundary element method to simulate nanoindentation, tracing individual dislocation motion to capture the load-displacement relationship at the nanoscale.
In the nano-plastic deformation, material properties such as yield stress cannot be described by the average rate of whole dislocation behavior, and it becomes increasingly necessary to trace individual motion of dislocations. The relationship between indent load-displacement in nanoindentation test is the typical example of recognizable nano-plasticity. Molecular dynamics (MD) is one of the most effective methodologies to obtain dislocation motion directly. However, MD simulation depends on the computer power so strongly that it is difficult to treat mesoscopic behavior including collective dislocation motion. On the other hand, discrete dislocation mechanics (DD) based on dislocation theory has a unique ability to treat dislocation motion, although boundary value problem in the DD framework would pose considerable difficulties. In the present paper, we construct a combined approach including both DD and the boundary element method (BEM), and succeed in representing the stress field of dislocation in the vicinity of traction free surface. Finally, we apply this model to the nanoindentation problem and found the relationship between displacement burst and collective dislocation motion.
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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.
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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Dislocation Nucleation and Interaction Under Nanoindentation in Single Crystalline Al and Cu (Simulations by Molecular Dynamics)
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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.
Atomistic Studies of Nanoindentation—A Review of Recent Advances
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This review covers advances in using computer simulations to understand how materials deform at the nanoscale during nanoindentation testing. The research is in materials science and not directly related to environmental microplastics.
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.
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