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Multiscale modelling of granular materials in boundary value problems accounting for mesoscale mechanisms
مدلسازی چند مقیاسی مواد دانهای در مسائل ارزش مرزی برای مکانیزمهای مقیاس متوسط-2021 The proper solution of geotechnical boundary value problems requires robust constitutive models that can
describe the mechanical behavior of geomaterials under various loading conditions, while also accounting as
closely as possible for the different material scales of interest. This is even more relevant to granular media where
the complexity of the mechanical behaviour is not limited to the nature of the contact law between grains, and
instead originates from the multiplicity of contacts oriented along all the directions of the physical space to form
distinctive mesostructures. This paper revisits the so-called H-model, which belongs to the broad family of
micromechanical approaches whereby an intermediate scale (mesoscale) is explicitly introduced into the
formulation. One great advantage of the model is that it can be extended by accounting for further multi-physical
couplings, as for example the presence of capillary bridges between grains. This versatile model was imple-
mented within an explicit finite difference based computational software (FLAC), and the present work dem-
onstrates its ability to analyze engineering problems with a microstructural viewpoint, while also providing new
insights in microstructural mechanisms of failure difficult to capture with standard phenomenological models. keywords: مواد گرانول | یکسان سازی | رویکرد چند منظوره | نظریه چندگانه | ریز ساختار | مقیاس Mesoscopic | مدل سازی سازنده | مدل H | مشکلات ارزش مرزی | Granular material | Homogenization | Multiscale approach | Multislip theory | Microstructure | Mesoscopic scale | Constitutive modeling | H-model | Boundary value problems |
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