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This study characterizes the thermo-mechanical behavior of poly(ether ether ketone) (PEEK) using various tests. Developed constitutive equations accurately predict PEEK

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Poly(ether ether ketone) (PEEK) is a high-performance thermoplastic with significant engineering applications.
  • Understanding its thermo-mechanical behavior under various conditions is crucial for reliable design.
  • Existing models may not fully capture the complex response of PEEK across a wide temperature range.

Purpose of the Study:

  • To investigate the thermo-mechanical behavior of PEEK under uniaxial deformation.
  • To develop and validate constitutive equations for predicting PEEK's response.
  • To analyze the activation energies associated with different deformation mechanisms.

Main Methods:

  • Uniaxial tensile, relaxation, and creep tests were conducted on PEEK.
  • Experiments were performed across a broad temperature range (room temperature to 180 °C) and various stress levels.
  • Constitutive equations were formulated and their parameters were optimized using experimental data.

Main Results:

  • Experimental observations were well-matched by the developed constitutive models.
  • Numerical simulations based on the equations showed good agreement with the test data.
  • Similar activation energy values were observed for elastoplastic, viscoelastic, and viscoelastoplastic responses above the glass transition temperature.

Conclusions:

  • The developed constitutive equations provide an accurate framework for describing PEEK's thermo-mechanical behavior.
  • The findings offer insights into the dominant deformation mechanisms of PEEK at elevated temperatures.
  • This research contributes to the predictive modeling of advanced polymer performance.