Effects of the Surface Contact on the Uncertainty in Indentation Yield Strength: Surface Roughness and Angular Misalignment

  • Oh Min Kwon
  • Jongho Won
  • Jong-hyoung Kim
  • Changhyun Cho
  • Eun-chae JeonEmail author
  • Dongil Kwon


We suggest a method for accurately estimating the uncertainty of indentation yield strength determined from the modified Meyer relation as a mathematical function of the measurement, taking into account Type A and Type B uncertainty. Using this method, we quantitatively compared the expanded uncertainty level of the yield strength as measured by instrumented indentation testing (IIT) and uniaxial tensile testing, and propose a dominant measurand that affects the final expanded uncertainty of the indentation yield strength. To interpret the difference in uncertainty between IIT and uniaxial tensile testing, we investigated the effect of the major sources of uncertainty in the IIT system: sample surface roughness and angular misalignment between the surface normal of the sample and the symmetric axis of the indenter. The surface roughness was controlled using 400-, 1000- and 2000-grit paper and the misalignment angle ranged over 0°, 1° and 2°. Acceptable surface roughness and standard uncertainty of misalignment angle are proposed that give the IIT similar uncertainty to uniaxial tensile testing.

Graphic Abstract


Indentation Yield strength Metals Uncertainty Spherical indenter 



This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1I1A3A01054545) and the Ministry of Science and ICT (No. NRF-2015R1A5A1037627).


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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  • Oh Min Kwon
    • 1
  • Jongho Won
    • 1
    • 2
  • Jong-hyoung Kim
    • 1
  • Changhyun Cho
    • 1
  • Eun-chae Jeon
    • 3
    Email author
  • Dongil Kwon
    • 1
  1. 1.Department of Materials Science and EngineeringSeoul National UniversitySeoulRepublic of Korea
  2. 2.Centre for Advanced Innovation Technologies (CPIT)VSB-Technical University of OstravaOstravaCzech Republic
  3. 3.School of Materials Science and EngineeringUniversity of UlsanUlsanRepublic of Korea

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