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Synchronous Full-Field Strain and Temperature Measurement in Tensile Tests at Low, Intermediate and High Strain Rates

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Abstract

Tensile tests with simultaneous full-field strain and temperature measurements at the nominal strain rates of 0.01, 0.1, 1, 200 and 3000 s−1 are presented. Three different testing methods with specimens of the same thin and flat gage-section geometry are utilized. The full-field deformation is measured on one side of the specimen, using the DIC technique with low and high speed visible cameras, and the full-field temperature is measured on the opposite side using an IR camera. Austenitic stainless steel is used as the test material. The results show that a similar deformation pattern evolves at all strain rates with an initial uniform deformation up to the strain of 0.25–0.35, followed by necking with localized deformation with a maximum strain of 0.7–0.95. The strain rate in the necking regions can exceed three times the nominal strain rate. The duration of the tests vary from 57 s at the lowest strain rate to 197 μs at the highest strain rate. The results show temperature rise at all strain rates. The temperature rise increases with strain rate as the test duration shortens and there is less time for the heat to dissipate. At a strain rate of 0.01 s−1 the temperature rise is small (up to 48 °C) but noticeable. At a strain rate of 0.1 the temperature rises up to 140 °C and at a strain rate of 1 s−1 up to 260 °C. The temperature increase in the tests at strain rates of 200 s−1 and 3000 s−1 is nearly the same with the maximum temperature reaching 375 °C.

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Acknowledgments

The research was supported by the U.S.A. Federal Aviation Administration, Grant No. 11-G-004. One of the authors (VTK) wishes to thank the Finnish Cultural Foundation for partial funding of his sabbatical leave at OSU. The authors are grateful to Mr. William Emmerling, and Dr. Chip Queitzsch from the FAA for their support and involvement.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH, USA

    J.D. Seidt, J.L. Smith & A. Gilat

  2. Department of Materials Science, Tampere University of Technology, Tampere, Finland

    V-T. Kuokkala

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  1. J.D. Seidt
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  2. V-T. Kuokkala
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  3. J.L. Smith
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  4. A. Gilat
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Correspondence to A. Gilat.

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Seidt, J., Kuokkala, VT., Smith, J. et al. Synchronous Full-Field Strain and Temperature Measurement in Tensile Tests at Low, Intermediate and High Strain Rates. Exp Mech 57, 219–229 (2017). https://doi.org/10.1007/s11340-016-0237-z

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  • DOI: https://doi.org/10.1007/s11340-016-0237-z

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