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Full-Text Articles in Engineering Science and Materials

Hierarchical Multiscale Modeling To Inform Continuum Constitutive Models Of Soils, Erik Wallace Jensen Jan 2017

Hierarchical Multiscale Modeling To Inform Continuum Constitutive Models Of Soils, Erik Wallace Jensen

Civil Engineering Graduate Theses & Dissertations

The behavior of soils is fundamentally the combined interactions between billions and billions of individual particles and particle matrices. For computational tractability and despite this fact, many soil models assume the material is a continuum essentially averaging the inter-particle interactions to predict the behavior of the bulk material. In recent years, multiscale modeling techniques have been developed to reintroduce the effect of the grain-scale interactions to help model situations where the continuum assumption fails, such as shear band development in triaxial tests or soil disaggregation under blast loading. One of such multiscale models called hierarchical upscaling, or global-local analysis, model ...


The Influence Of Representative Volume Element Size, Soil Fabric, And Interparticle Elasto-Plasticity In Three-Dimensional Ellipsoidal Discrete Element Modeling Of Granular Assemblies, Yevgeniy Kaufman Jan 2012

The Influence Of Representative Volume Element Size, Soil Fabric, And Interparticle Elasto-Plasticity In Three-Dimensional Ellipsoidal Discrete Element Modeling Of Granular Assemblies, Yevgeniy Kaufman

Civil Engineering Graduate Theses & Dissertations

In this comparative study of RVEs, a DEM code ELLIP3D is utilized to simulate quartz sand in triaxial compression tests with particle assemblies attained from an in situ fabric generated by synchrotron X-ray microcomputed tomography. In order to attain meaningful results for engineered systems at the macroscopic scale using DEM, RVE volume sizes play a significant role in the accuracy of simulating physical experiments. Simulation time or the number of particles limits the capacity of DEM to simulate large-scale granular systems, which is why it is crucial to determine an efficient quantity and quality of RVEs.

ELLIP3D simulations have been ...