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An indentation method for evaluation of residual stress: ESTIMATION of stress-free indentation curve using stress-independent indentation parameters

Published online by Cambridge University Press:  06 February 2019

Jong-hyoung Kim
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
Sungki Choi*
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
Junsang Lee
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
Hee-Jun Ahn
Affiliation:
Semiconductor R&D Center, Samsung Electronics, Hwaseong, Gyeonggi-do 18448, Korea
Young-Cheon Kim
Affiliation:
School of Advanced Materials Engineering, Andong National University, Andong, Gyeongsangbuk-do 36729, Korea
Min-Jae Choi*
Affiliation:
Nuclear Materials Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea
Dongil Kwon
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
*
a)Address all correspondence to this author. e-mail: mjchoi@kaeri.re.kr
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Abstract

Residual stress is generally evaluated using indentation by comparing the indentation curves of stressed and stress-free states. Here, we suggest a new method that can evaluate surface residual stress without indentation testing on stress-free specimen using stress-independent indentation parameters and an analysis of indentation contact morphology for the stress-free state. We found that several indentation parameters are independent of the stress by Vickers indentation testing on various stress states. The indentation contact morphology can be represented by indentation parameters including stress-independent ones, and by applying the stress-independent parameters obtained from the stressed state to the indentation contact depth function, we can estimate an indentation curve for stress-free state. The estimated curve matches well with the experimental stress-free indentation curve, and it was also confirmed that the applied stress values evaluated by comparing the estimated curve with the stressed indentation curve agree well with the reference values obtained from strain gauge.

Type
Article
Copyright
Copyright © Materials Research Society 2019 

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