Abstract
The effects of strain rate and deformation temperature on the deformation behaviors of polyether-ether-ketone (PEEK) were studied by uniaxial tensile tests with the temperature range of 23–150 °C and strain rate of 0.01–1 s−1. The effects of deformation temperature and strain rate on the hot tensile deformation behavior and fracture characteristics were investigated by scanning electron microscope (SEM) and discussed in detail. SEM experimental results suggest that fracture morphology is not strain rate sensitive but temperature sensitive. Based on the tensile results, the Johnson-Cook and modified Johnson-Cook constitutive models were established for PEEK. Furthermore, a comparative study has been made on the accuracy and effectiveness of the developed models to predict the flow stress. The results show that the original Johnson-Cook model reflects the deformation behavior more accurately throughout the entire test temperature and strain rate range under uniaxial tensile conditions.
Highlights
As a semi-crystalline, high purity polymer comprising of repeating monomers of two ether groups and a keytone group, PEEK has excellent mechanical properties maintained to high temperatures and appropriate biocompatibility [1e3]
It is obvious that the flow behaviors are heavily dependent on the deformation temperature and strain rate
The peak stress decreases with increasing the deformation temperature or decreasing the strain rate
Summary
As a semi-crystalline, high purity polymer comprising of repeating monomers of two ether groups and a keytone group, PEEK has excellent mechanical properties maintained to high temperatures and appropriate biocompatibility [1e3]. They have shown appropriate biocompatibility and comparable elastic modulus (3e4 GPa) to human bone structures, which is beneficial for the elimination of the extent of stress shielding that is often observed in titaniumbased metallic implants. F. Chen et al / Polymer Testing 63 (2017) 168e179 provide the basis for the majority of research on fracture properties of PEEK. Chen et al / Polymer Testing 63 (2017) 168e179 provide the basis for the majority of research on fracture properties of PEEK These studies give some great insights into the mechanical properties of PEEK at room temperature. A comprehensive constitutive model to describe the relationship of stress, strain rate and deformation temperature was developed and validated by experimental results
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