Thermomechanical model for monotonic and cyclic loading of PEEK

Wenlong Li, George Gazonas, Eric N. Brown, Philip J. Rae, Mehrdad Negahban

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An internal state variable (ISV) model for polyether ether ketone (PEEK) is developed to capture experimental measurements conducted below its glass transition temperature. The model is based on the response of two relaxing components put in parallel, one having a back stress response that softens with plastic flow. This softening allows reproducing both monotonic and cyclic loading, and is possibly associated with detangling, melting of network junctions, and/or change in crystallinity. The resulting model, which is thermodynamic and multidimensional, was used to capture the response of PEEK 450G using thermal expansion (23 °C to 120 °C), heat capacity (−40 °C to 140 °C), monotonic extension and compression (−85 °C to 150 °C; 0.0001 s−1 to 3000 s−1; strains up to 40–80%), equilibrium stress measurements in compression (23 °C to 120 °C; strains up to 60%), and ultrasonic longitudinal and shear wave speed measurements along and transverse to the directions of compression (23 °C to 120 °C; up to 50% plastic compression). The model is compared to the response under monotonic and cyclic shear and internal dissipation is assessed using the equivalent adiabatic temperature rise.

Original languageEnglish (US)
Pages (from-to)113-138
Number of pages26
JournalMechanics of Materials
Volume129
DOIs
StatePublished - Jan 1 2019

Fingerprint

Polyether ether ketones
ketones
ethers
stress measurement
plastic flow
Shear waves
Stress measurement
longitudinal waves
Plastic flow
softening
glass transition temperature
Specific heat
S waves
Thermal expansion
thermal expansion
crystallinity
Melting
Compaction
plastics
dissipation

Keywords

  • Internal state variable
  • Mechanical
  • Modeling
  • Polyether ether ketone (PEEK)
  • Thermodynamic

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Thermomechanical model for monotonic and cyclic loading of PEEK. / Li, Wenlong; Gazonas, George; Brown, Eric N.; Rae, Philip J.; Negahban, Mehrdad.

In: Mechanics of Materials, Vol. 129, 01.01.2019, p. 113-138.

Research output: Contribution to journalArticle

Li, Wenlong ; Gazonas, George ; Brown, Eric N. ; Rae, Philip J. ; Negahban, Mehrdad. / Thermomechanical model for monotonic and cyclic loading of PEEK. In: Mechanics of Materials. 2019 ; Vol. 129. pp. 113-138.
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