Effect of adding support structures for overhanging part on fatigue strength in selective laser melting

Yuka Kajima, Atsushi Takaichi, Takayuki Nakamoto, Takahiro Kimura, Nuttaphon Kittikundecha, Yusuke Tsutsumi, Naoyuki Nomura, Akira Kawasaki, Hidekazu Takahashi, Takao Hanawa, Noriyuki Wakabayashi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Selective laser melting (SLM) technology was recently introduced to fabricate dental prostheses. However, the fatigue strength of clasps in removable partial dentures prepared by SLM still requires improvement. In this study, we attempted to improve the fatigue strength of clasps by adding support structures for overhanging parts, which can generally be manufactured at an angle to be self-supporting. The results show that the fatigue strength of the supported specimens was more than twice that of unsupported specimens. Electron back-scattered diffraction analysis revealed that the supported specimens exhibited lower kernel average misorientation values than the unsupported specimens, which suggested that the support structure reduced the residual strain during the SLM process and helped to prevent micro-cracks led by thermal distortion. In addition, the supported specimens cooled more rapidly, thereby forming a finer grain size compared to that of the unsupported specimens, which contributed to improving the fatigue strength. The results of this study suggest that the fatigue strength of overhanging parts can be improved by intentionally adding support structures.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume78
DOIs
Publication statusPublished - 2018 Feb

Keywords

  • Clasp
  • Co–Cr–Mo alloy
  • Fatigue strength
  • Finite element simulation
  • Selective laser melting
  • Support structure

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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    Kajima, Y., Takaichi, A., Nakamoto, T., Kimura, T., Kittikundecha, N., Tsutsumi, Y., Nomura, N., Kawasaki, A., Takahashi, H., Hanawa, T., & Wakabayashi, N. (2018). Effect of adding support structures for overhanging part on fatigue strength in selective laser melting. Journal of the Mechanical Behavior of Biomedical Materials, 78, 1-9. https://doi.org/10.1016/j.jmbbm.2017.11.009