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http://dx.doi.org/10.14773/cst.2021.20.6.484

Determination of Knoop Indentation Stress Conversion Factors for Measuring Equibiaxial Residual Stress  

Jeong, Min Jae (School of Materials Science & Engineering, Research Center for Energy and Clean Technology, Andong National University)
Kim, Young-Cheon (School of Materials Science & Engineering, Research Center for Energy and Clean Technology, Andong National University)
Publication Information
Corrosion Science and Technology / v.20, no.6, 2021 , pp. 484-490 More about this Journal
Abstract
Instrumented indentation testing has been widely used for residual stress measurement. The Knoop indentation is mainly selected for determining anisotropic mechanical properties and non-equibiaxial residual stress. However, the measurement of equibiaxial stress state and compressive residual stress on a specimen surface using Knoop indentation is neither fully comprehended nor unavailable. In this study, we investigated stress conversion factors for measuring Knoop indentation on equibiaxial stress state through indentation depth using finite element analysis. Knoop indentation was conducted for specimens to determine tensile and compressive equibiaxial residual stress. Both were found to be increased proportionally according to indentation depth. The stress field beneath the indenter during each indentation test was also analyzed. Compressive residual stress suppressed the in-plane expansion of stress field during indentation. In contrast, stress fields beneath the indenter developed diagonally downward for tensile residual stress. Furthermore, differences between trends of stress fields at long and short axes of Knoop indenter were observed due to difference in indenting angles and the projected area of plastic zone that was exposed to residual stress.
Keywords
Equibiaxial stress; Residual stress; Knoop indentation; Stress conversion factor; FEM;
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