135 Anomalous surface deformation of sapphire clarified by 3D-FEM simulation of the nanoindentation

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概要

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• This work clarifies the origin of anomalous surface deformation reflected by peculiar surface patterns around indentation impressions on various crystallographic planes of sapphire. The three-dimensional finite element simulation (3D-FEM) of nanoindentation in Al_2O_3 crystal allowed the authors to localize the regions in which various kinds of twinning and slip are most prone to be activated. The work provides a novel approach to the "hardness anisotropy", which was modeled so far using a modified uniaxial-stress approximation of this essentially 3D, non-isotropic contact problem. The calculated results enabled the authors to unravel the unexpected surface deformation detected by the high-resolution microscopy, which remained a dilemma for the nanoindentation of sapphire, and cannot be explained by simple crystallographic consideration

• 一般社団法人日本機械学会の論文

著者

• Soga T.

  Nagoya Institute of Technology

• Nowak R.

  Department Of Materials Science Helsinki University Of Technology:mechanical Engineering Hiroshima U

• Manninen T.

  Department of Engineering Physics & Mathematics, Helsinki University of Technology

• Li C.

  MASS Research Center, Japan Electronics Industry Ltd.

• Heiskanen K.

  Department of Materials Science, Helsinki University of Technology

• Lindroos V.

  Department of Materials Science, Helsinki University of Technology

• Hannula SP.

  VTT Industrial Systems

• Yoshida F.

  Mechanical Engineering, Hiroshima University

• Manninen T.

  Department Of Engineering Physics & Mathematics Helsinki University Of Technology

• Heiskanen K.

  Department Of Materials Science Helsinki University Of Technology

• Lindroos V.

  Department Of Materials Science Helsinki University Of Technology

• Li C.

  Mass Research Center Japan Electronics Industry Ltd.

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• 135 Anomalous surface deformation of sapphire clarified by 3D-FEM simulation of the nanoindentation

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