Micromechanical analysis of non-coaxiality between stress and strain increment in granular materials
| Autor: | Peijun Guo, Jingshan Shi, Dieter Stolle |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Computer simulation 010102 general mathematics Stress–strain curve 0211 other engineering and technologies Stiffness 02 engineering and technology Plasticity Geotechnical Engineering and Engineering Geology Granular material Rotation 01 natural sciences Solid mechanics Earth and Planetary Sciences (miscellaneous) medicine 0101 mathematics Composite material medicine.symptom Anisotropy 021101 geological & geomatics engineering |
| Zdroj: | Acta Geotechnica. 15:2559-2574 |
| ISSN: | 1861-1133 1861-1125 |
| DOI: | 10.1007/s11440-020-00923-x |
| Popis: | It is known that non-coaxiality between the directions of the principal stresses and the principal plastic strain increments in granular material is physically resulted from the material and mechanical anisotropy as well as their evolutions. A novel study was conducted to verify the contributions of the material and mechanical anisotropies to the magnitude of non-coaxiality during the rotation of the principal stress orientation. Micromechanical analysis indicates that the non-coaxial behavior can occur in a granular assembly with mostly non-sliding contacts acting. Moreover, the magnitude of non-coaxiality is a function of the stress level, the ratio of contact stiffness, the material and mechanical anisotropy as well as their evolutions. This has been confirmed by numerical simulation. The numerical results indicate that the non-sliding interparticle connectivity is one of the dominant sources of non-coaxiality. The interparticle sliding has been found to reduce the magnitude of the non-coaxiality. |
| Databáze: | OpenAIRE |
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