Journal
POLYMER TESTING
Volume 69, Issue -, Pages 514-521Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2018.06.003
Keywords
Poly-ether-ether-ketone (PEEK); Constitutive model; Uniaxial tension; Viscoelastic; Temperature dependence
Funding
- National Natural Science Foundation of China [11432003, 11602050, 11702053]
- National High Technology Research and Development Program of China [2015AA033803]
- 111 Project [B14013]
- Fundamental Research Funds for the Central Universities [DUT16TD05, DUT17LK08, DUT17ZD305]
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To accurately characterize the tension behavior of Poly-ether-ether-ketone (PEEK) under small strain is essential to predict the mechanical properties of the PEEK and PEEK-based composites. Therefore, the uniaxial tensile responses of PEEK prior to necking are studied at strain rates ranging from 10(-5) s(-1) to 10(-1) s(-1) and temperatures ranging from -60 degrees C to 140 degrees C. The tensile responses exhibit nonlinear characteristics and the dependence of temperature and strain rate. With temperature increasing, the yield stress and yield strain of PEEK dramatically decrease while the modulus decreases slightly. Based on the uniaxial tensile results, a phenomenological nonlinear viscoelastic constitutive model is proposed to characterize the stress-strain of PEEK before yielding considering temperature and strain rate dependence, and the model is used to predict the tensile behavior of PEEK. The results indicate the proposed constitutive model can accurately predict the nonlinear tensile stress-strain responses and the yield stress of PEEK over a wide range of temperatures under small strain.
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