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    王新宇

    •      
    • 性别:男
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:机械工程学院
    • 电子邮箱:seringwang@dlut.edu.cn

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    Constitutive modeling for the accurate characterization of the tension behavior of PEEK under small strain

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    论文类型:期刊论文

    发表时间:2018-08-01

    发表刊物:POLYMER TESTING

    收录刊物:SCIE

    卷号:69

    页面范围:514-521

    ISSN号:0142-9418

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

    摘要: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.