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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

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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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