Characterization and Modeling of PEEK in Histories with Reverse Loading

  • Wenlong Li
  • George Gazonas
  • Eric N. Brown
  • Philip J. Rae
  • Mehrdad NegahbanEmail author
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


Traditional viscoelastic models for describing polymer response during large deformations are normally designed to capture the response during monotonic loading and typically have difficulty capturing the response after a reversal of the deformation process. In particular, most models pay little attention to capturing the equilibrium stress, the anisotropy developed after plastic flow in the elastic response, and the characteristics of the yield and subsequent flow after reversal of the loading. To characterize these events, the thermo-mechanical response of PEEK is studied during shear histories that have one or more points at which the strain rate is reversed. In particular, using digital image correlation (DIC) methods, the response of PEEK is captured during processes that subject the material to histories that reverse the straining direction one or more times. These studies show that the response of PEEK in monotonic loading is very different from that observed after reversing the loading, and also from that observed in further cycling. Yet, after multiple cycles of loading and reverse loading, if the loading is then continue beyond the point that loading reversal was initiated in the cycling, the response after this point returns to that of the initial monotonic loading.


Poly-ether-ether-ketone (PEEK) Shear Reverse loading Cyclic loading Plastic flow 



Authors appreciate the supported from the US Army Research Laboratory (Contract Number W911NF-11-D-0001-0094). The tests were conducted in the Stress Analysis Center of University of Nebraska-Lincoln.


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Copyright information

© The Society for Experimental Mechanics, Inc. 2018

Authors and Affiliations

  • Wenlong Li
    • 1
  • George Gazonas
    • 2
  • Eric N. Brown
    • 3
  • Philip J. Rae
    • 3
  • Mehrdad Negahban
    • 1
    Email author
  1. 1.Mechanical & Materials Engineering DepartmentUniversity of Nebraska-LincolnLincolnUSA
  2. 2.U.S. Army Research LaboratoryAberdeen Proving GroundUSA
  3. 3.Los Alamos National LaboratoryLos AlamosUSA

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