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

Chang, Baoning; Wang, Xinyu; Long, Zhiqiang; Li, Zheng; Gu, Junfeng; Ruan, Shilun; Shen, Changyu

doi:10.1016/j.polymertesting.2018.06.003

Cited by 24 publications

(12 citation statements)

References 34 publications

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“…To further investigate the performance of the proposed model, a stress–strain constitutive model reported by Chang et al [ 37 ] is adopted for comparison purposes. This model is formed by appending a quadratic term and a cubic term of the strain to the regular linear model, as in Equation ( 14 ):

where the parameters

, and

are fitting parameters.…”

Section: Model Validations and Comparisonsmentioning

confidence: 99%

A General Temperature-Dependent Stress–Strain Constitutive Model for Polymer-Bonded Composite Materials

et al. 2021

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This study develops a general temperature-dependent stress–strain constitutive model for polymer-bonded composite materials, allowing for the prediction of deformation behaviors under tension and compression in the testing temperature range. Laboratory testing of the material specimens in uniaxial tension and compression at multiple temperatures ranging from −40 ∘C to 75 ∘C is performed. The testing data reveal that the stress–strain response can be divided into two general regimes, namely, a short elastic part followed by the plastic part; therefore, the Ramberg–Osgood relationship is proposed to build the stress–strain constitutive model at a single temperature. By correlating the model parameters with the corresponding temperature using a response surface, a general temperature-dependent stress–strain constitutive model is established. The effectiveness and accuracy of the proposed model are validated using several independent sets of testing data and third-party data. The performance of the proposed model is compared with an existing reference model. The validation and comparison results show that the proposed model has a lower number of parameters and yields smaller relative errors. The proposed constitutive model is further implemented as a user material routine in a finite element package. A simple structural example using the developed user material is presented and its accuracy is verified.

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where the parameters

, and

are fitting parameters.…”

Section: Model Validations and Comparisonsmentioning

confidence: 99%

A General Temperature-Dependent Stress–Strain Constitutive Model for Polymer-Bonded Composite Materials

et al. 2021

View full text Add to dashboard Cite

show abstract

“…As PEEK is a semicrystalline polymer, its time- and rate-dependent behavior can be described by conventional models in viscoelasticity and viscoplasticity of semicrystalline polymers, see [ 41 , 42 , 43 ], to mention a few. Constitutive equations accounting for the peculiarities in the thermo–mechanical response of PEEK induced by stiffness of its backbone chains were developed in [ 18 , 19 , 22 , 24 , 29 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on the thermo–mechanical behavior of PEEK focused on its viscoelastic and viscoplastic responses below the glass transition temperature

°C [ 24 , 29 , 44 , 45 , 46 ]. Above this temperature, only observations in tensile tests with constant strain rates were reported and analyzed in [ 18 , 19 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Behavior of Poly(ether ether ketone): Experiments and Modeling

Drozdov

Christiansen

2021

Polymers

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Observations are reported on poly(ether ether ketone) (PEEK) in uniaxial tensile tests, relaxation tests and creep tests with various stresses in a wide interval of temperatures ranging from room temperature to 180 °C. Constitutive equations are developed for the thermo–mechanical behavior of PEEK under uniaxial deformation. Adjustable parameters in the governing equations are found by matching the experimental data. Good agreement is demonstrated between the observations and results of numerical simulation. It is shown that the activation energies for the elastoplastic, viscoelastic and viscoelastoplastic responses adopt similar values at temperatures above the glass transition point.

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“…On the other hand, the mechanical performance of polymer and polymer composites remarkably depends on the testing temperature [15,16]. The tensile modulus and strength of PEEK decrease with the temperature increases, especially above the glass transition temperature ( T g ) [17,18]. Therefore, it is essential to investigate the tensile behavior of SCF/PEEK at high temperatures to better understand the mechanical behavior and extend the applications of SCF/PEEK under the conditions of high environmental temperature such as automotive and aerospace industries.…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and fiber orientation on the tensile behavior of short carbon fiber reinforced PEEK composites

Chang

Long

et al. 2020

Polymer Composites

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Short carbon fiber reinforced poly‐ether‐ether‐ketone (SCF/PEEK) composites have attracted great attention in automobile and aerospace industries for their excellent thermal and mechanical properties. To investigate the anisotropy and temperature effects on mechanical properties of SCF/PEEK composites, tensile tests were conducted in various mold flow directions at 23, 80, 140, and 200°C. Results show that the tensile behavior of SCF/PEEK is highly influenced by temperature and fiber orientation. Both tensile strength and elastic modulus decrease with the increasing of temperature, and fracture strain increases with the increasing of temperature. Scanning electron microscopy was conducted to investigate the effects of anisotropy and temperature on fracture mechanism by scanning the tensile fracture surfaces. A shell‐core‐shell structure across the sample thickness was observed. Fibers are mainly aligned in mold flow direction in shell layers and perpendicular to the mold flow direction in core layers. The anisotropy of SCF/PEEK composites is fiber orientation dominated, and the temperature‐dependence of SCF/PEEK is matrix‐dominated. The variations of elastic modulus and tensile strength with temperature were mathematically represented. Constitutive model was established to predict the stress‐strain curves over a wide range of temperatures. Overall, the constitutive model could predict the temperature dependent stress‐strain relationships well.

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

Cited by 24 publications

References 34 publications

A General Temperature-Dependent Stress–Strain Constitutive Model for Polymer-Bonded Composite Materials

A General Temperature-Dependent Stress–Strain Constitutive Model for Polymer-Bonded Composite Materials

Thermo-Mechanical Behavior of Poly(ether ether ketone): Experiments and Modeling

Effects of temperature and fiber orientation on the tensile behavior of short carbon fiber reinforced PEEK composites

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