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PEEK Temperature Dependence

Technical Challenge:
Polyether ether ketone (PEEK) materials are increasingly used in industry, including seals in oil and gas equipment and as a bearing surface for orthopedic implants such as knee and hip joints.  In many of these applications, the polymer is subjected to loading cycles at elevated temperatures.  Thus, accurate simulations of PEEK behavior require the constitutive model used for the material to capture time- and temperature-dependent behavior.  Despite this need, there are few material models available in commercial software codes capable of capturing the combined effects of temperature, strain rate and time.

Veryst Solution:
Veryst developed an advanced constitutive model for PEEK to capture its time- and temperature-dependent behavior.  First, Veryst designed an efficient test program that probed the temperature-dependent relaxation behavior of a representative PEEK formulation.  The results of these tests were imported to Veryst’s MCalibration software, which was used to calibrate parameters for the Three Network Model (TNM), available in Veryst’s PolyUMod library.  Figures 1 and 2 illustrate the final comparison of the calibrated model with experiment.  The resulting model can simulate the behavior of PEEK components across a wide range of temperatures using commercial finite element codes such as SIMULIA Abaqus, ANSYS and LS-Dyna. 

 PEEK_temperature_stress_strain

Figure 1 – Stress-strain behavior of a PEEK material subjected to load/unload cycles with intermediate relaxation steps.  Solid lines indicate the experimentally measured response.  Dashed lines show corresponding predictions given by the calibrated Three Network Model (TNM) from the PolyUMod library.  

 

 PEEK_temperature_stress_relaxation

Figure 2 –  Corresponding experimentally measured (solid lines) and predicted (dashed lines) relaxation behavior during the stress-strain cycles shown in Figure 1. 

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