3D Discrete Element Method (DEM) with induced electrostatic cohesion

By Daniel Bustamante

Granular materials can acquire electrostatic charges during collisions in various industrial processes. The present work is dedicated to the mechanical simulation of granular media using a method of discrete cohesive elements. It is a model based on packages composed of three-dimensional grains of arbitrary shape obtained from real samples by combining X-ray computerized tomography (3DXRCT) and mathematical functions called level sets. The electrostatic cohesion is introduced in the scale of the particles by incorporating an electric charge density on the surface of the grains. The effect of the introduction of electrostatic cohesion is visualized by the construction of Mohr circles in which an axial compression process is carried out on the packing, while the walls of this packing are kept at different confining pressures.

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Analytical study of slope stability in dry, cohesionless 2D granular media

By Fabian

We study, from an analytical point of view, the inter-particle interactions in dry, cohesionless 2D granular media to find the micromechanical origin of landslides. Our analytical study is compared to the results of numerical simulations of granular materials in a rotating tumbler. These simulations are based on a contact dynamics method.

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3D Image processing: image segmentation and recognition using neural networks

By Kuntur Mallku Muenala Terán

The study and understanding of soil behavior involve the use of highly expensive equipment in the laboratory. Furthermore, obtaining soil samples for study in these laboratories involves complex and laborious procedures, in addition to the difficult accessibility that present some places where samples are made. For these reasons and considering the great computational development of the last decades, creation of a digital database of soils that will allow computational simulation of all procedures performed in laboratories, as well as natural phenomena such as landslides and subsidence due to geological faults, is proposed. It in turn will help prevent risks related to infrastructure damage and loss of life.

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3D models of construction materials

By Manolo Noboa

Medical devices, specially the ones used for tomography, are extremely expensive, because they must be highly precise and secure. For the same reason, they are constantly changed for more actual models, and the old devices are deposited in warehouses. Even though, they are still functional, and their capacities are stull useful in other fields. That’s how this project arises, proposing the reuse of one of these devices, adapting it so it is able to generate 3D models of construction materials.

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A hybrid backanalysis algorithm for calibration of DEM parameters against experimental results

By Sebastian Pazmiño

In this project, the implementation and combination of genetic algorithms (GA), principal component analysis (PCA) and gradient-based methods (GBM) with which to explore and find the global minimum (if there is one) have been proposed. ) of a given objective function for the calibration of the parameters of a computational scheme of discrete elements (3DLS-DEM), in such a way that the error between the results of the computational form is minimized using 3DLS-DEM and the results means of A true laboratory experiment.

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A geometry-based algorithm for cloning real grains 2.0

An enhanced algorithm for cloning soil that enables us to generate an arbitrary number of real grains to include them in 3D simulations to predict more accurately geological scale phenomena like earthquakes, landslides and lahar flow.

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Modeling of a real sample of concrete

3D images extracted from 3DXRCT scanning with image processing techniques and then converted to level sets (mathematical functions) in order to include them for first time in single-axial loading.

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Isogeometric analysis for the description of a surfactant spreading in a thin liquid film

By David Medina

The study of the spreading of surfactants is well known in many industrial and medical applications. This topic is important to improve efficiency of the coating by surfactants because of the non-uniform coating present in both soluble and insoluble surfactants in liquid films. The complexity in the physics and the experiments forced researchers to use the aid of computational tools and many works have been performed using numerical simulations.

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