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Identification of the constitutive equation by the indentation technique using plural indenters with different apex angles

Published online by Cambridge University Press:  31 January 2011

Masatoshi Futakawa ,
Takashi Wakui ,
Yuji Tanabe  and
Ikuo Ioka
Masatoshi Futakawa*
Affiliation:
Department of Nuclear Energy Systems, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibakaki-ken, 319–1195, Japan
Takashi Wakui
Affiliation:
Department of Mechanical Engineering, Niigata University, Ikarashi Ni-nocho, Niigata-shi, Niigata-ken, 950–2181, Japan
Yuji Tanabe
Affiliation:
Department of Mechanical Engineering, Niigata University, Ikarashi Ni-nocho, Niigata-shi, Niigata-ken, 950–2181, Japan
Ikuo Ioka
Affiliation:
Department of Nuclear Energy Systems, Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibakaki-ken, 319–1195, Japan
*
a)Address all correspondence to this author.futakawa@popsvr.tokai.jaeri.go.jp
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Abstract

This paper describes a novel technique for determining the constitutive equation of elastic–plastic materials by the indentation technique using plural indenters with different apex angles. Finite element method (FEM) analyses were carried out to evaluate the effects of yield stress, work hardening coefficient, work hardening exponent, and the apex angle of indenter on the load–depth curve obtained from the indentation test. As a result, the characterized curves describing the relationship among the yield stress, work hardening coefficient, and the work hardening exponent were established. Identification of the constants of a constitutive equation was made on the basis of the relationship between the characterized curves and the hardness given by the load–depth curve. This technique was validated through experiments on Inconel 600 and aluminum alloy. The determined constitutive equation was applied to the FEM analyses to simulate the deformation including necking behavior under uniaxial tension. The analytical results are in good agreement with experimental results.

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Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2283 - 2292
Copyright
Copyright © Materials Research Society 2001

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References

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