A constitutive model for predicting the large deformation thermomechanical behavior of fluoropolymers

Bergström, Jörgen; Hilbert, L.B.

doi:10.1016/j.mechmat.2004.09.002

Cited by 69 publications

(27 citation statements)

References 14 publications

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“…A similar relationship between the moduli of PTFE and dry PFSA was discussed in our previous work [72]. We also observe that the temperature-driven decrease in Young's Modulus of PTFE [67,68,71] is similar to that observed for PFSA membranes at low humidities (Fig. 6).…”

Section: Constitutive Response Of Liquid-equilibrated Pfsa Membranesupporting

confidence: 88%

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Constitutive response and mechanical properties of PFSA membranes in liquid water

Kusoglu

Tang

Lugo

et al. 2010

Journal of Power Sources

103

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Section: Constitutive Response Of Liquid-equilibrated Pfsa Membranesupporting

confidence: 88%

“…Thus, by assuming that the PTFE-like backbone of the swollen PFSA membrane exhibits simi lar deformation behavior to that of PTFE, we can explain some of our experimental observations for the PFSA membrane by using the reported data on the mechanical behavior of PTFE [67][68][69][70][71].…”

Section: Constitutive Response Of Liquid-equilibrated Pfsa Membranementioning

confidence: 76%

Constitutive response and mechanical properties of PFSA membranes in liquid water

Kusoglu

Tang

Lugo

et al. 2010

Journal of Power Sources

103

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“…An example of the strain rate dependence is shown in Fig. 7a [174] showing a nonlinear viscoelastic region to a distributed yield followed by unrecoverable deformation, viscoplastic flow, and stiffening at large strains [181]. Additionally, the true stress at 15 % strain versus strain rate for a variety of PTFE materials is shown in Fig.…”

Section: Semi-crystalline Polymersmentioning

confidence: 99%

High Strain Rate Mechanics of Polymers: A Review

Siviour

Jordan

2016

J. dynamic behavior mater.

285

121

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The mechanical properties of polymers are becoming increasingly important as they are used in structural applications, both on their own and as matrix materials for composites. It has long been known that these mechanical properties are dependent on strain rate, temperature, and pressure. In this paper, the methods for dynamic loading of polymers will be briefly reviewed. The high strain rate mechanical properties of several classes of polymers, i.e. glassy and rubbery amorphous polymers and semi-crystalline polymers will be reviewed. Additionally, time-temperature superposition for rate dependent large strain properties and pressure dependence in polymers will be discussed. Constitutive modeling and shock properties of polymers will not be discussed in this review.

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“…Therefore, in order to develop effective strategies to improve durability, it is essential to characterize the mechanical properties of these membranes at different temperatures and hu midities. It is well documented that humidity and temperature affect the material properties and the deformation behavior of polymers: Several studies regarding the deformation behavior of semicrys talline polymers, including fluoropolymers such as PTFE [20][21][22], as well as studies on the influence of temperature and/or humidity on the mechanical properties of Nafion ® polymer membranes, have been published [14,17,18,[23][24][25][26][27]. However, to the knowl edge of the authors, only a limited number of studies related to the stress-strain behavior of PFSA membranes are available in the open literature [17,18,23,26,27].…”

mentioning

confidence: 99%

Stress-Strain Behavior of Perfluorosulfonic Acid Membranes at Various Temperatures and Humidities: Experiments and Phenomenological Modeling

Kusoglu

Tang

Santare

et al. 2008

Journal of Fuel Cell Science and Technology

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The constitutive response of perfluorinated sulfonic acid (PFSA) membranes based on tensile testing is investigated, and a phenomenological constitutive model for the elastoplastic flow behavior as a function of temperature and humidity is proposed. To this end, the G’Sell–Jonas (1979, “Determination of the Plastic Behavior of Solid Polymers at Constant True Strain Rate,” J. Mater. Sci., 14, pp. 583–591) constitutive model for semicrystalline polymers is extended by incorporating, in addition to temperature, relationships between the material constants of this model and the measured relative humidity. By matching the proposed constitutive model to the experimental stress-strain data, useful material constants are found. Furthermore, correlations between these material constants and Young’s modulus and proportional limit stress are investigated. The influence of material orientation, inherited from processing conditions, on the stress-strain behavior is also studied. The proposed model can be used to approximate the mechanical behavior of PFSA membranes in numerical simulations of a fuel cell operation.

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A constitutive model for predicting the large deformation thermomechanical behavior of fluoropolymers

Cited by 69 publications

References 14 publications

Constitutive response and mechanical properties of PFSA membranes in liquid water

Constitutive response and mechanical properties of PFSA membranes in liquid water

High Strain Rate Mechanics of Polymers: A Review

Stress-Strain Behavior of Perfluorosulfonic Acid Membranes at Various Temperatures and Humidities: Experiments and Phenomenological Modeling

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