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Vol.47, No.7, 416 ~ 423, 2009
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| Title |
| Analytical Approaches of Surface-Local Deformations for the Measurement of Indentation Hardness |
| 이윤희 Yun Hee Lee , 김국환 Kuk Hwan Kim , 남승훈 Seung Hoon Nahm , 권동일 Dong Il Kwon |
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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. |
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| Key Words |
| indentation hardness, surface pile-up, Oliver-Pharr`s analysis, modified Stilwell-Tabor`s analysis, image differentiation analysis |
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