Preprints

Filtering by Subject: Materials Science and Engineering

Linking elastic and electrical properties of rocks using cross-property DEM

Phillip Andrew Cilli, Mark Chapman

Published: 2020-10-22
Subjects: Earth Sciences, Engineering Science and Materials, Geophysics and Seismology, Materials Science and Engineering, Physical Sciences and Mathematics

Joint electrical-elastic rock physics modelling can be instrumental in lowering uncertainty in subsurface reservoir characterisation. Typical electrical-elastic cross-property models, however, are empirical or require an intermediate step of porosity estimation to link a rock's electrical and elastic moduli, which can be error-prone away from well controls. Another outstanding issue in [...]

Predicting the yield stress of a 3D printed porous material from its internal structure

Martin Lesueur, Thomas Poulet, Emmanouil Veveakis

Published: 2020-05-12
Subjects: Engineering, Materials Science and Engineering, Structural Materials

The design of any engineering structure requires the knowledge, and therefore determination, of the yield, i.e. limit of elasticity, for the building material. Whilst destructive experimental testing is currently necessary to do so, our work is part of initiatives which aim at deriving the yield without such laboratory experiments. The seminal work of Gurson (1977) on a simplified pore structure, [...]

A note on the instability and pattern formation of shrinkage cracks in viscoplastic soils

Emmanouil Veveakis, Thomas Poulet

Published: 2019-11-08
Subjects: Civil and Environmental Engineering, Engineering, Materials Science and Engineering

In this note we present a theoretical study on the conditions for the onset of cracks, as well as the corresponding pattern formation, in saturated viscoplastic soils under isotropic loading (extension). The type of stress applied is left unspecified, to cover a variety of loadings including shrinkage due to dessication, isotropic thermal expansion, mechanical loading and so forth. By treating [...]

Imbibition in porous media: correlations of displacement events with pore-throat geometry and the identification of a new type of pore snap-off

Kamaljit Singh, Tom Bultreys, Ali Q. Raeini, Mosayeb Shams, Martin J. Blunt

Published: 2019-08-23
Subjects: Chemical Engineering, Civil and Environmental Engineering, Complex Fluids, Dynamics and Dynamical Systems, Engineering, Engineering Science and Materials, Environmental Engineering, Materials Science and Engineering, Mechanics of Materials, Petroleum Engineering, Transport Phenomena

The displacement of a non-wetting fluid by a wetting fluid in porous media, called imbibition, is important in many natural and industrial processes. During imbibition, the wetting fluid invades the pore space through a series of competitions between piston-like displacement, film and corner flow, snap-off, pore bypassing and trapping. Our understanding of these fundamental pore-scale [...]

A Temperature- and Pressure-Sensitive Visco-Plasticity Theory based on Interface Mechanisms for Sedimentary Rocks

Mustafa Sari, Sotiris Alevizos, Thomas Poulet, Jack Lin, Emmanouil Veveakis

Published: 2019-05-24
Subjects: Civil and Environmental Engineering, Engineering, Geotechnical Engineering, Materials Science and Engineering, Other Materials Science and Engineering

Constitutive modelling in geotechnical engineering and applied earth sciences is facing the challenge of assessing the long-term potential of both man-made and natural geohazards. This involves designing engineering operations for length scales and timescales well beyond those observable in the laboratory. In order to bridge the gap between scales, study rock behaviours well beyond their yield [...]

A spatially resolved fluid-solid interaction model for dense granular packs/Soft-Sand.

Paula Alejandra Gago, Ali Q. Raeini, Peter King

Published: 2019-05-09
Subjects: Earth Sciences, Engineering, Materials Science and Engineering, Physical Sciences and Mathematics

Fluid flow through dense granular packs or soft sands can be described as a Darcy s flow for low injection rates, as the friction between grain-grain and grain-walls dominate the solid system behaviour. For high injection rates, fluid forces can generate grain displacement forming flow channels or ``fractures, which in turn modify local properties within the system, such as permeability and [...]

  • 1 
search

You can search by:

  • Title
  • Keywords
  • Author Name
  • Author Affiliation