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Communication Dans Un Congrès Année : 2014

Impact of EBM Fabrication Strategies on Geometry and Mechanical Properties of Titanium Cellular Structures

Résumé

Manufacturing well controlled cellular materials by conventional methods is strongly difficult 2 (foaming, replication...). Additive Manufacturing appears to be a promising answer for such structures. The EBM technology is indeed theoretically able to produce freeform metallic open cell materials or lattice structures 3. However, due to the process, differences in strut geometries are observed between the CAD model and the manufactured parts, which affect mechanical properties. This study is focused on the determination and improvement of parameters which tailor the mesostructure of titanium cellular structures made by EBM. Mechanical properties are determined by compressive tests on various cellular structures (Cubic, Octet-truss...). Results indicate that the desired relative density (as defined by the CAD model) is not relevant for giving a correct estimation of the mechanical properties. Different sizes, shapes and orientations of struts have been quantitatively studied using X-Ray tomography. Geometry and residual porosity are analysed. An effective cross-section is defined and compared to the desired one. This effective cross-section is strongly related to the strut orientations and fabrication strategies. It allows to explain discrepancies in mechanical properties (stiffness and strength) between desired and real structures. The comparison with tomography results shows the necessity to adapt Gibson and Ashby's laws4 for the mechanical properties prediction of cellular solids made by EBM.
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Dates et versions

hal-00997293 , version 1 (27-05-2014)

Identifiants

  • HAL Id : hal-00997293 , version 1

Citer

Mathieu Suard, Pierre Lhuissier, Rémy Dendievel, Frédéric Vignat, Jean-Jacques Blandin, et al.. Impact of EBM Fabrication Strategies on Geometry and Mechanical Properties of Titanium Cellular Structures. Direct Digital Manufacturing Conference 2014, Mar 2014, Berlin, Germany. ⟨hal-00997293⟩
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