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Challenges in Mechanics of Time Dependent Materials, Volume 2 pp 181–186Cite as

Back Stress in Modeling the Response of PEEK and PC

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Abstract

With the development of new methods for the characterization of equilibrium stress through cyclic loading, it is now possible to follow the evolution of back stress during the nonlinear deformation of polymers. Experiments on PEEK and PC below the glass-transition temperature indicate a back stress that may evolve with plastic deformation, and which is substantially different from that seen during the response in the rubbery range. In particular, the back stress during the response of PC shows the characteristic post-yield softening, possibly indicating that the observed post-yield softening in the response comes from the back stress. This is not seen in PEEK, which also shows no substantial post-yield softening. The equilibrium stress plays a central role in modeling both the quasi-static and dynamic response of PEEK.

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Acknowledgement

The research was partially supported by the US Army Research Laboratory through Contract Number W911NF-11-D-0001-0094. The experiments were completed by utilizing the stress analysis facility at the University of Nebraska-Lincoln.

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Authors and Affiliations

  1. Mechanical and Materials Engineering, University of Nebraska-Lincoln, W311 Nebraska Hall, Lincoln, NE, 68588, USA

    Wenlong Li & Mehrdad Negahban

  2. U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD, 21005, USA

    George Gazonas

  3. Los Alamos National Laboratory, Los Alamos, NM, USA

    Eric N. Brown & Philip J. Rae

Authors
  1. Wenlong Li
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  2. George Gazonas
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  3. Eric N. Brown
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  4. Philip J. Rae
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  5. Mehrdad Negahban
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Corresponding author

Correspondence to Mehrdad Negahban .

Editor information

Editors and Affiliations

  1. Sandia National Laboratories , Livermore, California, USA

    Bonnie Antoun

  2. Psylotech, Evanston, Illinois, USA

    Alex Arzoumanidis

  3. Georgia Institute of Technology, Atlanta, Georgia, USA

    H. Jerry Qi

  4. Cornell University, Ithaca, New York, USA

    Meredith Silberstein

  5. University of Massachusetts, Lowell, Massachusetts, USA

    Alireza Amirkhizi

  6. Exxon Mobile, Irving, Texas, USA

    Jevan Furmanski

  7. University of Texas at Dallas, Richardson, Texas, USA

    Hongbing Lu

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© 2017 The Society for Experimental Mechanics, Inc.

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Li, W., Gazonas, G., Brown, E.N., Rae, P.J., Negahban, M. (2017). Back Stress in Modeling the Response of PEEK and PC. In: Antoun, B., et al. Challenges in Mechanics of Time Dependent Materials, Volume 2. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-41543-7_23

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  • DOI: https://doi.org/10.1007/978-3-319-41543-7_23

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-41542-0

  • Online ISBN: 978-3-319-41543-7

  • eBook Packages: EngineeringEngineering (R0)

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