Mechanical Characterization and Preliminary Modeling of PEEK

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

Abstract

Poly-ether-ether-ketone (PEEK) is a high-performance semi-crystalline polymer with mechanical and thermal stability characteristics that are superior to most tough polymers. The mechanical characteristics of this polymer are modeled over a broad range of mechanical loading conditions using a thermodynamically consistent modeling process. This preliminary model, which ignores the thermal response and the possible recrystallization of this material during loading, shows an outstanding ability to capture the multidimensional nonlinear response of PEEK up to 60 % compression, with loading rates from 0.0001 to 3000 1/s at room temperature. The model includes the measured anisotropy in the wave response that develops with plastic flow, captures the evolution of the measured equilibrium stress, and correctly matches the evolution of the tangent modulus at equilibrium. This broad range of rates and experimental conditions are achieved by using a two-element nonlinear thermodynamically-consistent model.

Keywords

Poly-ether-ether-ketone (PEEK) Equilibrium stress Plastic flow Anisotropic elasticity Mechanical modeling 

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Copyright information

© The Society for Experimental Mechanics, Inc. 2016

Authors and Affiliations

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

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