Residual Stress Estimation with Identification of Stress Directionality Using Instrumented Indentation Technique

Abstract:

The instrumented indentation technique (IIT) has recently attracted significant research interest because it is nondestructive and easy to perform, and can characterize materials on local scales. Residual stress can be determined by analyzing the indentation load-depth curve from IIT. However, this technique using a symmetric indenter is limited to an equibiaxial residual stress state. In this study, we determine the directionality of the non-equibiaxial residual stress by using the Knoop indentation technique. Different indentation load-depth curves are obtained at nonequibiaxial residual stresses depending on the Knoop indentation direction. A model for Knoop indentation was developed through experiments and theoretical analysis.

• Periodical: Key Engineering Materials (Volumes 345-346)
• Pages: 1125-1128
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.345-346.1125
• Online since: August 2007
• Authors: Jae Hwan Han, Jung Suk Lee, Yun Hee Lee, Min Jae Choi, Gyu Jei Lee, Kwang Ho Kim, Dong Il Kwon
• Keywords: Instrumented Indentation Technique, Knoop Indenter, Residual Stress Directionality

References

[1] I. C. Noyan and J. B. Cohen: Residual Stress (Springer-Verlag, New York 1987).

[2] J. Lu: Handbook of Measurement of Residual Stress (Fairmont Press, Lilburn 1996).

[3] Y.H. Lee and D. Kwon: Acta Mater. Vol. 52 (2004), p.1555.

[4] Y.H. Lee, K. Takashima and D. Kwon: Scripta Mater. Vol. 51 (2004), p.887.

[5] W.C. Oliver and G.M. Pharr: J. Mater. Res. Vol. 7 (1992), p.1580.

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