Special Issue "Numerical Analysis of Concrete using Discrete Elements"
A special issue of Materials (ISSN 1996-1944).
Deadline for manuscript submissions: closed (10 December 2016)
Prof. Dr. Erik Schlangen
Faculty of Civil Engineering and Geosciences, Micromechanics Laboratory, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
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Interests: micromechanics of civil engineering materials; durability mechanics; self healing of materials; lattice modeling for fracture and transport
Numerical analysis of concrete is widely used when designing concrete structures, but is also used when investigating the concrete material. Various techniques have been developed to perform an analysis of concrete at different scales, and to analyze different properties, behaviors and failures, or transport mechanisms. One of these analysis techniques makes use of Discrete Elements, and is also called lattice type models or lattice discrete particle models.
An area in which Discrete Elements are often applied is in fracture processes in concrete. Mechanical loading on the material or a structure leads to stresses, which result in localized cracking. It is known that models that use Discrete Elements are very well capable of simulating crack patterns that match perfectly with experimental findings. These models are especially suited when dealing with fractures in heterogeneous materials like concrete, where crack patterns are tortuous and follow the weakest link in the material. Additionally, materials that incorporate fibers are studied using Discrete Elements and even ductile behavior can be modeled realistically.
Another topic that can be tackled with these models is transport. Lattice type models are applied to study moisture flow, both in diffusion or permeability, through concrete. In addition, heat or gas flow in heterogeneous materials like concrete can be studied with lattice models.
A further challenge is the combination of mechanical loading and transport phenomena. Mechanical loading leads to cracks in the material, which enhances the transport. Furthermore, the transport leads to moisture or temperature gradients, which induce stresses that can propagate cracks.
The Discrete Element models are, on the one hand, adopted to study the basic mechanisms of mechanics or transport in both concrete materials and structures. On the other hand, they can be applied to study deterioration mechanisms like processes such as corrosion, restrained drying shrinkage, alkali-silica reaction, and the effect of those on the performance of a concrete structure.
Prof. Dr. Erik Schlangen
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- Numerical Modeling
- Lattice models
- Discrete Elements