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Evaluation of nonequibiaxial residual stress using Knoop indenter

Published online by Cambridge University Press:  04 November 2011

Min-Jae Choi ,
Seung-Kyun Kang ,
Ingeun Kang  and
Dongil Kwon
Min-Jae Choi
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Seung-Kyun Kang
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Ingeun Kang
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Dongil Kwon*
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
*
a)Address all correspondence to this author. e-mail: dongilk@snu.ac.kr
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Abstract

The instrumented indentation test is an important alternative in quantifying residual stresses. Various indentation models have been developed to determine residual stresses, but no previous models can be applied to a nonequibiaxial residual stress state. To overcome this limitation, a Knoop indentation technique was developed to use the asymmetric characteristics of the Knoop indenter. With the ratio of conversion factors and equations for the relation between the load differences and the residual stress, a model of Knoop indentation was developed to determine the stress directionality p. This model was verified and compared through experiments on various biaxial tensile stress states. Imperfections in the Knoop tip change the conversion factor ratio. Using finite element simulations, this change in the conversion factor was expressed by a fitting equation.

Keywords

HardnessWeldingNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 1: Focus Issue: Instrumented Indentation , 14 January 2012 , pp. 121 - 125
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

1.Noyan, I.C. and Cohen, J.B.: Residual Stresses (Springer-Verlag, New York, 1987).CrossRefGoogle Scholar
2.Lu, J., James, M.R., and Roy, G.: Handbook of Measurement of Residual Stresses (Fairmont Press, Lilburn, 1996).Google Scholar
3.ISO 14577: Metallic Materials–Instrumented Indentation Test for Hardness and Materials Parameters (International Organization for Standardization, Geneva, Switzerland, 2002).Google Scholar
4.Fischer-Cripps, A.C.: Nanoindentation (Springer, New York, 2002).Google Scholar
5.Tsui, T.Y., Oliver, W.C., and Pharr, G.M.: Influences of stress on the measurement of mechanical properties using nanoindentation: Part I. Experimental studies in an aluminum alloy. J. Mater. Res. 11, 752 (1996).CrossRefGoogle Scholar
6.Bolshakov, A., Oliver, W.C., and Pharr, G.M.: Influences of stress on the measurement of mechanical properties using nanoindentation: Part II. Finite element simulations. J. Mater. Res. 11, 760 (1996).CrossRefGoogle Scholar
7.Suresh, S. and Giannakopoulos, A.E.: A new method for estimating residual stresses by instrumented sharp indentation. Acta Mater. 46, 5755 (1998).Google Scholar
8.Carlsson, S. and Larsson, P-L.: On the determination of residual stress and strain fields by sharp indentation testing. Part I: Theoretical and numerical analysis. Acta Mater. 49, 2179 (2001).CrossRefGoogle Scholar
9.Carlsson, S. and Larsson, P-L.: On the determination of residual stress and strain fields by sharp indentation testing. Part II: Experimental investigation. Acta Mater. 49, 2193 (2001).CrossRefGoogle Scholar
10.Swadener, J.G., Taljat, B., and Pharr, G.M.: Measurement of residual stress by load and depth-sensing indentation with spherical indenters. J. Mater. Res. 16, 2091 (2001).CrossRefGoogle Scholar
11.Giannakopoulos, A.E.: The influence of initial elastic surface stresses on instrumented sharp indentation. J. Appl. Mech. 70, 638 (2003).CrossRefGoogle Scholar
12.Lee, Y-H. and Kwon, D.: Measurement of residual-stress effect by nanoindentation on elastically strained (100) W. Scr. Mater. 49, 459 (2003).CrossRefGoogle Scholar
13.Lee, Y-H. and Kwon, D.: Estimation of biaxial surface stress by instrumented indentation with sharp indenters. Acta Mater. 52, 1555 (2004).Google Scholar
14.Han, J-H., Lee, J-S., Lee, Y-H., Choi, M-J., Lee, G., Kim, K-H., and Kwon, D.: Residual stress estimation with identification of stress directionality using instrumented indentation technique. Key Eng. Mater. 345–346, 1125 (2007).Google Scholar
15.Giannakopoulos, A.E. and Zisis, Th.: Analysis of Knoop indentation. Int. J. Solids Struct. 48, 175 (2011).Google Scholar