Fractional derivative in the elastic-viscoplastic stress-strain state model describing anisotropic creep of soft clays
| Autor: | Feng-xi Zhou, Li-ye Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Viscoplasticity Yield surface Mechanical Engineering General Chemical Engineering Stress–strain curve Aerospace Engineering 02 engineering and technology Mechanics Physics::Geophysics Fractional calculus 020303 mechanical engineering & transports 0203 mechanical engineering Creep Solid mechanics Hardening (metallurgy) General Materials Science Anisotropy |
| Zdroj: | Mechanics of Time-Dependent Materials. 26:133-147 |
| ISSN: | 1573-2738 1385-2000 |
| DOI: | 10.1007/s11043-020-09480-y |
| Popis: | A fractional elastic-viscoplastic (F-EVP) creep model describing the anisotropy of soft soil is established. A nonlinear viscoplastic creep expression is obtained by a fractional derivative and the Laplace transformation, which is extended by the definition of the reference yield surface. On this basis, the anisotropy of soil is considered in the model by a rotating hardening criterion, and the effect of anisotropic parameters on the stress-dilatancy ratio is discussed. The scalar multiplier in the form of stress ratio is described, and a critical friction angle is used to unify the modeling parameter. The validity of the model is examined by the existing triaxial creep results. The results indicate that the rotational anisotropy induces coaxial rotation as the result of the stress-dilatation relationship. The fractional viscoplastic model can reasonably describe the plastic behavior of soil before yielding, and accurately characterize the creep behavior of soil. From the comparison between the test results and the model calculation results, it is found that the model calculation results are basically consistent with the test results. |
| Databáze: | OpenAIRE |
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