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

Roman Nowak, Timo Manninen, Chunliang Li, Kari Heiskanen, Simo-Pekka Hannula, Veikko Lindroos, Tetsuo Soga, Fusahito Yoshida

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

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 Al2O3 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 asymmetric surface deformation detected on prismatic planes by the high-resolution microscopy, which cannot be explained using simple crystallographic considerations.
Original languageEnglish
Pages (from-to)265-271
Number of pages7
JournalJSME International Journal, Series 1: Solid Mechanics, Strength of Materials
Volume46
Issue number3
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Nanoindentation
Sapphire
Finite element method
Twinning
Indentation
Microscopic examination
Anisotropy
Hardness
Crystals

Keywords

  • nanoindentation
  • twinning
  • slip
  • FEM simulation
  • sapphire
  • anisotropic contact problem

Cite this

Nowak, Roman ; Manninen, Timo ; Li, Chunliang ; Heiskanen, Kari ; Hannula, Simo-Pekka ; Lindroos, Veikko ; Soga, Tetsuo ; Yoshida, Fusahito. / Anomalous surface deformation of sapphire clarified by 3D-FEM simulation of the nanoindentation. In: JSME International Journal, Series 1: Solid Mechanics, Strength of Materials. 2003 ; Vol. 46, No. 3. pp. 265-271.
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abstract = "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 Al2O3 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 asymmetric surface deformation detected on prismatic planes by the high-resolution microscopy, which cannot be explained using simple crystallographic considerations.",
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Anomalous surface deformation of sapphire clarified by 3D-FEM simulation of the nanoindentation. / Nowak, Roman; Manninen, Timo; Li, Chunliang; Heiskanen, Kari; Hannula, Simo-Pekka; Lindroos, Veikko; Soga, Tetsuo; Yoshida, Fusahito.

In: JSME International Journal, Series 1: Solid Mechanics, Strength of Materials, Vol. 46, No. 3, 2003, p. 265-271.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Nowak, Roman

AU - Manninen, Timo

AU - Li, Chunliang

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AU - Hannula, Simo-Pekka

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AU - Soga, Tetsuo

AU - Yoshida, Fusahito

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AB - 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 Al2O3 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 asymmetric surface deformation detected on prismatic planes by the high-resolution microscopy, which cannot be explained using simple crystallographic considerations.

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