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Determination of directionality of nonequibiaxial residual stress by nanoindentation testing using a modified Berkovich indenter

Published online by Cambridge University Press:  20 September 2018

Jong-hyoung Kim ,
Huiwen Xu ,
Min-Jae Choi ,
Eunju Heo ,
Young-Cheon Kim  and
Dongil Kwon
Jong-hyoung Kim*
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
Huiwen Xu
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
Min-Jae Choi
Affiliation:
Nuclear Materials Division, KAERI (Korea Atomic Energy Research Institute), Daejeon 34057, Korea
Eunju Heo
Affiliation:
Center for Multi-scale Testing and Assessment at Combined Environment, Seoul National University, Seoul 08826, Korea
Young-Cheon Kim*
Affiliation:
Materials Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University, 1375 Gyeongdong-ro, Andong, Gyeongbuk, 36729, 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: kimyc@anu.ac.kr
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Abstract

We suggest a new method to evaluate stress directionality, the ratio of principal stresses, using nanoindentation by introducing a modified Berkovich indenter that is extended in one direction from the Berkovich indenter. In a nonequibiaxial stress state, the indentation load-depth curves are shifted differently as the extended axis of the indenter is placed in accordance with each principal direction. The indentation load-difference is proportional to each principal stress and the slopes are defined by the normal and parallel conversion factors whose ratio is constant at 0.58. The suggested method was verified by indentation tests using five nonequibiaxial stressed specimens. The evaluated stress directionality results show agreement with the applied reference values within ±20%. Furthermore, we calculated the conversion factor ratios for other modified Berkovich indenters extended to different degrees through finite element analysis and confirmed that the conversion factor ratio was inversely proportional to the extension of the modified Berkovich indenter.

Keywords

nanoindentationstress/strain relationshipmetal
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 22 , 28 November 2018 , pp. 3849 - 3856
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

This author contributed equally to this work.

References

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