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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.
This review covers areas where our understanding of the mechanisms underlying nanoindentation has been increased by atomistic studies of the nanoindentation process. While such studies have been performed now for more than 20 years, recent investigations have demonstrated that the peculiar features of nanoplasticity generated during indentation can be analyzed in considerable detail by this technique. Topics covered include: nucleation of dislocations in ideal crystals, effect of surface orientation, effect of crystallography (fcc, bcc, hcp), effect of surface and bulk damage on plasticity, nanocrystalline samples, and multiple (sequential) indentation. In addition we discuss related features, such as the influence of tip geometry on the indentation and the role of adhesive forces, and how pre-existing plasticity affects nanoindentation.
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This study used molecular dynamics simulations to investigate how indenter size affects the nanoscale plastic deformation of silicon. It is a materials science study on nanomechanics and is not related to environmental microplastics.
Nanoindentation-Induced Collective Dislocation Behavior and Nanoplasticity
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A one-dimensional micromechanical model of elastic-microplastic damage evolution
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A one-dimensional micromechanical model based on Dugdale microcracks predicts elastic-microductile damage evolution, capturing both macroscopic hardening and softening behavior during loading and continuous damage accumulation during unloading. This physically-based damage model provides a foundation for predicting progressive failure in ductile materials subjected to monotonic loading.
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.
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.
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