Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Analytical Approaches of Surface-Local Deformations for the Measurement of Indentation Hardness

압입경도 측정을 위한 표면변형 분석기법 비교

  • Lee, Yun-Hee (Division of Industrial Metrology, Korea Research Institute of Standards and Science) ;
  • Kim, Kuk-Hwan (School of Materials Science and Engineering, Seoul National University) ;
  • Nahm, Seung-Hoon (Division of Industrial Metrology, Korea Research Institute of Standards and Science) ;
  • Kwon, Dongil (School of Materials Science and Engineering, Seoul National University)
  • 이윤희 (한국표준과학연구원 산업측정표준본부 신재생에너지측정센터) ;
  • 김국환 (서울대학교 재료공학부) ;
  • 남승훈 (한국표준과학연구원 산업측정표준본부 신재생에너지측정센터) ;
  • 권동일 (서울대학교 재료공학부)
  • Received : 2009.05.29
  • Published : 2009.07.25
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Abstract

Approaches for analyzing indentation hardness are still controversial, although the instrumented indentation technique has been generalized as one powerful method that can record surface deformation behaviors. Material pile-ups around the indenter/surface contact region make the conventional Oliver and Pharr's analysis on the instrumented indentation curve inaccurate. Thus, in order to prove the validity of the hardness analyses, five approaches were applied to the experimental data obtained from fused quartz and (100) monocrystalline tungsten specimens; an elastic recovery analysis on instrumented indentation curves, three indentation work analyses on the unit plastic volume, and a differentiation analysis on remnant indentation morphologies were tried. Five kinds of indentation hardness overlapped on one result plot showed the validity of each analysis. The modified indentation work approach based on a new definition of plastic volume showed consistent results with those from the Oliver-Pharr's and image differentiation methods. In the case of pile-up accompanying deformation, the Oliver-Pharr's and image differentiation methods showed the upper and lower limits of indentation hardness, respectively.

Keywords

Acknowledgement

Supported by : 지식경제부

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