Elastic properties of solid material with various arrangements of spherical voids
| Autor: | Thomas Titscher, Daniel Kreuter, Denis Weaire, Wiebke Drenckhan, Jochen Fröhlich, Frederic Piechon, David Hajnal, Sascha Heitkam |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Void (astronomy)
Materials science FOS: Physical sciences General Physics and Astronomy Modulus Geometry Young's modulus Astrophysics::Cosmology and Extragalactic Astrophysics 02 engineering and technology 01 natural sciences symbols.namesake 0103 physical sciences General Materials Science Composite material 010306 general physics Porosity Condensed Matter - Materials Science Mechanical Engineering Linear elasticity Isotropy Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Poisson's ratio Mechanics of Materials symbols 0210 nano-technology Material properties |
| Zdroj: | European Journal of Mechanics - A/Solids. 59:252-264 |
| ISSN: | 0997-7538 |
| DOI: | 10.1016/j.euromechsol.2016.04.003 |
| Popis: | In this work the linear elastic properties of materials containing spherical voids are calculated and compared using finite element simulations. The focus is on homogeneous solid materials with spherical, empty voids of equal size. The voids are arranged on crystalline lattices (SC, BCC, FCC and HCP structure) or randomly, and may overlap in order to produce connected voids. In that way, the entire range of void fraction between 0.00 and 0.95 is covered, including closed-cell and open-cell structures. For each arrangement of voids and for different void fractions the full stiffness tensor is computed. From this, the Young's modulus and Poisson ratios are derived for different orientations. Special care is taken of assessing and reducing the numerical uncertainty of the method. In that way, a reliable quantitative comparison of different void structures is carried out. Among other things, this work shows that the Young's modulus of FCC in the (1 1 1) plane differs from HCP in the (0 0 0 1) plane, even though these structures are very similar. For a given void fraction SC offers the highest and the lowest Young's modulus depending on the direction. For BCC at a critical void fraction a switch of the elastic behaviour is found, as regards the direction in which the Young's modulus is maximised. For certain crystalline void arrangements and certain directions Poisson ratios between 0 and 1 were found, including values that exceed the bounds for isotropic materials. For subsequent investigations the full stiffness tensor for a range of void arrangements and void fractions are provided in the supplemental material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect