期刊
POLYMER TESTING
卷 63, 期 -, 页码 168-179出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2017.07.032
关键词
PEEK; Hot deformation; Fracture characteristics; Constitutive modelling
资金
- Engineering and Physical Science Research Council [EP/K029592/1, EP/L02084X/1]
- International Research Staff Exchange Scheme [IRSES, MatProFuture project] within the 7th European Community Framework Programme (FP7) [318,968]
- EPSRC [EP/L02084X/1, EP/K029592/1, EP/K005138/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L02084X/1, EP/K029592/1, EP/K005138/1] Funding Source: researchfish
The effects of strain rate and deformation temperature on the deformation behaviors of polyether-etherketone (PEEK) were studied by uniaxial tensile tests with the temperature range of 23-150 degrees 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. (C) 2017 The Authors. Published by Elsevier Ltd.
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