Apparent properties of porous support structure with imperfections in metal additive manufacturing

Takumi Oshima, Naoki Takano

研究成果: Article査読

抄録

In the laser powder bed fusion (L-PBF) additive manufacturing (AM) of metals, support structure is necessary for overhang shaped components. This support is porous with periodic 2D lattice microstructure. The purpose of this paper is to predict numerically the apparent properties of porous support made by titanium alloy, Ti-6Al-4V. One of the problems involved in L-PBF AM is the geometrical imperfections, which are also seen in the microstructure of the support. Micro-CT imaging revealed the variation in strut width and the disconnections. They were parameterized and statistically measured for two cases with different design parameter that determines the density of the 2D lattice microstructure. Based on the statistically measured data, three probabilistic microstructure models were generated per one design parameter. The asymptotic homogenization method was applied to calculate the apparent Young's moduli, shear moduli and thermal conductivities assuming orthotropic material model. The calculated results were compared with those based on the CAD data without imperfections. Finally, the apparent properties were correlated with the design parameter so that they can be used in the process simulation in the design phase before manufacturing.

本文言語English
論文番号104090
ジャーナルAdditive Manufacturing
84
DOI
出版ステータスPublished - 2024 3月 25

ASJC Scopus subject areas

  • 生体医工学
  • 材料科学一般
  • 工学(その他)
  • 産業および生産工学

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