Application of molecular dynamics simulations for the generation of dense concrete mesoscale geometries
| Autor: | Thomas Titscher, Jörg F. Unger |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Aggregate (composite) Grading on a curve Mechanical Engineering Computation 0211 other engineering and technologies Mesoscale meteorology Geometry 02 engineering and technology 01 natural sciences Finite element method Computer Science Applications Molecular dynamics Modeling and Simulation 021105 building & construction 0103 physical sciences Volume fraction Particle General Materials Science 010306 general physics Civil and Structural Engineering |
| Zdroj: | Computers & Structures. 158:274-284 |
| ISSN: | 0045-7949 |
| Popis: | Fast generation of mesostructures for concrete using a molecular dynamics simulation.Significant increase of volume fraction compared to commonly used methods.Efficient optimization techniques to handle a large number of particles.Introduction of a minimal particle distance to ensure undistorted FE-meshes. The problem of polydisperse sphere packings is applied to concrete mesoscale geometries in finite sized specimens. Realistic sphere diameter distributions are derived from concrete grading curves. An event-driven molecular dynamics simulation using growing particles is introduced. Compared to the widely used random sequential addition algorithm, it reaches denser aggregate packings and saves computation time at high volume fractions.A minimal distance between particles strongly influences the maximum aggregate content. It is essential to obtain undistorted elements when meshing the geometry for finite element simulations. The algorithm maximizes this value and produces meshable concrete mesostructures with more than 70% aggregate content. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect