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Finite element study for determination of material’s creep parameters from small punch test

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Abstract

Compared with the conventional tensile creep test, it is much more difficult to obtain the creep properties of a material by the small punch creep test due to the complex deformation response and stress distribution in the miniature specimen of the material. Although creep behavior has been investigated by the small punch test, most studies have been limited to a specimen geometry and therefore, cannot be extended to other conditions conveniently. In this study, a new developed analysis routine is presented to derive the creep parameters of a material using data obtained from the small punch creep test. With the aid of the finite element method, the displacement and the displacement rate of the small punch are obtained for different load levels. The relationship between the stress and creep strain of the specimen and the applied load and the punch displacement is obtained by a dimensional analysis and the membrane stretching model. The creep properties obtained from small punch tests and the conventional creep tests are also compared. The values of the creep properties between the two types of tests agree well with each other within an acceptable accuracy range. This indicates that it is possible to obtain the creep parameters of a material from the small punch creep test instead of the conventional creep test by the analysis routines proposed in this study. Some suggestions for data reduction of the small punch creep tests are also presented to obtain more accurate material creep parameters.

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Author information

Authors and Affiliations

  1. Research Associates, Department of Mechanical Engineering, Chung Ang University, 221 Huksuk Dongjak, Seoul, 156-756, Korea

    Jianjun Chen & Young Wha Ma

  2. Department of Mechanical Engineering, Chung Ang University, 221 Huksuk Dongjak, Seoul, 156-756, Korea

    Kee Bong Yoon

Authors
  1. Jianjun Chen
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  2. Young Wha Ma
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  3. Kee Bong Yoon
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Corresponding author

Correspondence to Kee Bong Yoon.

Additional information

This paper was recommended for publication in revised form by Associate Editor Youngseog Lee

Jian Jun Chen received his Ph. D. degree in Mechanical Engineering from East China University of Science and Technology, China, in 2008. Dr. Chen is currently a Post Doctor at the School of Mechanical Engineering of Chung-Ang University in Seoul, Korea. His research interests are mainly in the material’s high temperature behavior, the creep properties obtained by the non-standard specimen and the interaction between creep and fatigue.

Young Wha Ma received his Ph. D. degree in Mechanical Engineering from Chung-Ang University, Korea in 2007. After that, he worked at Georgia Institute of Technology, U.S.A. as a postdoc. Dr. Ma is currently a research professor at Mechanical Engineering of Chung-Ang University in Seoul, Korea. His interest is mainly in application of high temperature fracture mechanics to residual life assessment of structural materials including anisotropic materials such as gas turbine blade.

Kee Bong Yoon has conducted various researches in the field of high temperature fracture mechanics including creep and creep-fatigue crack growth behavior of structural materials. He has further interest in application such as residual life assessment of power plant components and risk based maintenance approaches. After 10 year experiences in a national research institute he moved to the mechanical engineering department in Chung Ang University. He received his B.E. and M.S from Seoul National University and KAIST respectively and he got Ph.D. degree from Georgia Tech in U.S.A. Currently he is the research dean of the University.

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Chen, J., Ma, Y.W. & Yoon, K.B. Finite element study for determination of material’s creep parameters from small punch test. J Mech Sci Technol 24, 1195–1201 (2010). https://doi.org/10.1007/s12206-010-0327-2

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  • DOI: https://doi.org/10.1007/s12206-010-0327-2

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