Measuring nonlinear stresses generated by defects in 3D colloidal crystals
| Autor: | Peter Schall, Neil Y. C. Lin, Itai Cohen, Matthew Bierbaum, James P. Sethna |
|---|---|
| Přispěvatelé: | IoP (FNWI), Other Research IHEF (IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Yield (engineering)
Materials science FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter 01 natural sciences Stress (mechanics) Condensed Matter::Materials Science Vacancy defect 0103 physical sciences General Materials Science 010306 general physics Condensed Matter - Statistical Mechanics Condensed Matter - Materials Science Condensed matter physics Statistical Mechanics (cond-mat.stat-mech) Mechanical Engineering Fluid Dynamics (physics.flu-dyn) Materials Science (cond-mat.mtrl-sci) General Chemistry Physics - Fluid Dynamics Colloidal crystal Strain hardening exponent 021001 nanoscience & nanotechnology Condensed Matter Physics Mechanics of Materials Soft Condensed Matter (cond-mat.soft) Grain boundary Dislocation 0210 nano-technology Transport phenomena |
| Zdroj: | Nature Materials, 15(11), 1172-1176. Nature Publishing Group |
| ISSN: | 1476-1122 |
| Popis: | The mechanical, structural and functional properties of crystals are determined by their defects and the distribution of stresses surrounding these defects has broad implications for the understanding of transport phenomena. When the defect density rises to levels routinely found in real-world materials, transport is governed by local stresses that are predominantly nonlinear. Such stress fields however, cannot be measured using conventional bulk and local measurement techniques. Here, we report direct and spatially resolved experimental measurements of the nonlinear stresses surrounding colloidal crystalline defect cores, and show that the stresses at vacancy cores generate attractive interactions between them. We also directly visualize the softening of crystalline regions surrounding dislocation cores, and find that stress fluctuations in quiescent polycrystals are uniformly distributed rather than localized at grain boundaries, as is the case in strained atomic polycrystals. Nonlinear stress measurements have important implications for strain hardening, yield, and fatigue. Comment: in Nature Materials (2016) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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