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An efficient way of extracting creep properties from short-time spherical indentation tests

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Abstract

Indentation as a means to extract creep properties has the advantage that it can be applied directly to micro/nano-structures. Many studies on indentation creep reported at least partially poor agreement with creep parameters derived from uniaxial test. One important reason for the incompatibility is the neglect of transient creep. Another one is the choice of equivalent stress and strain measures to relate the different material responses. Applying a material model that accounts for transient creep effects we propose an efficient method for deriving creep properties from short-time spherical indentation tests. We first determine a subsurface point where the material response is very close to that observed in uniaxial tests. We then map the load–displacement data to the material response, expressed in terms of two dimensionless variables, at this point. Converting the dimensionless variables data to stress, strain, and strain rate data, we finally determine the material’s creep coefficient and exponent.

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ACKNOWLEDGMENTS

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (No. NRF-2012 R1A2A2A 01046480).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sogang University, Seoul, 121-742, Republic of Korea

    Felix Rickhey & Hyungyil Lee

  2. Korea Atomic Energy Research Institute, Daejeon, 305-353, Republic of Korea

    Jin Haeng Lee

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  1. Felix Rickhey
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  2. Jin Haeng Lee
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Correspondence to Hyungyil Lee.

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Rickhey, F., Lee, J.H. & Lee, H. An efficient way of extracting creep properties from short-time spherical indentation tests. Journal of Materials Research 30, 3542–3552 (2015). https://doi.org/10.1557/jmr.2015.322

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