Understanding elastic anisotropy in diamond based lattice structures produced by laser powder bed fusion: Effect of manufacturing deviations
| Autor: | Brecht Van Hooreweder, Gabriel Probst, Sergio Ruiz de Galarreta, Antonio Cutolo, Markel Alaña |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
FE modeling 02 engineering and technology Crystal structure engineering.material 010402 general chemistry 01 natural sciences law.invention Ti-6Al-4 V Laser powder bed fusion - Ti-6Al-4 V - lattice structures - anisotropy - FE modeling law Orientation (geometry) lcsh:TA401-492 General Materials Science Anisotropy Fusion Mechanical Engineering Process (computing) Diamond Mechanics 021001 nanoscience & nanotechnology Laser Finite element method 0104 chemical sciences Mechanics of Materials Laser powder bed fusion engineering Lattice structures lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 195, Iss, Pp 108971-(2020) |
| Popis: | Laser powder bed fusion (L-PBF) allows the production of metal lattice cellular structures with tailored mechanical properties. In order to generate the specific structural behavior it is of utmost importance to understand the response of the unit cells when different load conditions are considered. In this article the mechanical response of diamond based cellular structures has been investigated focusing on the impact of geometrical inaccuracy generated by the manufacturing process on the elastic anisotropy of the mentioned unit cell. The μ-CT analysis of the structures shows that the manufacturing deviations occur in certain orientations that depend highly on the building direction and proximity to nodes. The measured imperfection types were implemented in a finite element model in order to predict their single and combined effects in the elastic directional response. The results indicate that the L-PBF process can induce a significant change of elastic anisotropy in the diamond unit cells, including a substantial variation of the optimal orientation for minimal compliance. Methods are presented to calculate this anisotropy such that it can be taken into account when designing and using such lattice structures in real-life applications with multi-axial load conditions. |
| Databáze: | OpenAIRE |
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