Indexed by:期刊论文

Date of Publication:2018-08-01

Journal:POLYMER TESTING

Included Journals:SCIE

Volume:69

Page Number:514-521

ISSN No.:0142-9418

Key Words:Poly-ether-ether-ketone (PEEK); Constitutive model; Uniaxial tension; Viscoelastic; Temperature dependence

Abstract: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.