CoCrMo cellular structures made by Electron Beam Melting studied by local tomography and finite element modelling

Clémence Petit, Eric Maire, Sylvain Meille, Jérôme Adrien, Shingo Kurosu, Akihiko Chiba

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The work focuses on the structural and mechanical characterization of Co-Cr-Mo cellular samples with cubic pore structure made by Electron Beam Melting (EBM). X-ray tomography was used to characterize the architecture of the sample. High resolution images were also obtained thanks to local tomography in which the specimen is placed close to the X-ray source. These images enabled to observe some defects due to the fabrication process: small pores in the solid phase, partially melted particles attached to the surface. Then, in situ compression tests were performed in the tomograph. The images of the deformed sample show a progressive buckling of the vertical struts leading to final fracture. The deformation initiated where the defects were present in the strut i.e. in regions with reduced local thickness. The finite element modelling confirmed the high stress concentrations of these weak points leading to the fracture of the sample.

Original languageEnglish
Pages (from-to)48-54
Number of pages7
JournalMaterials Characterization
Volume116
DOIs
Publication statusPublished - 2016 Jun 1

Keywords

  • Finite element
  • Mechanical behaviour
  • Porous samples
  • X-ray tomography

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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