The effects of high pressure on mechanical behavior and properties of polytetrafluoroethylene and polyethylene

Pae, K. D.; Mears, D.R.

doi:10.1002/pol.1968.110060401

Cited by 49 publications

(17 citation statements)

References 2 publications

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“…Once X is determined experimentally, it is a simple matter to assign values to B then compute the corresponding values of R. Obviously, as P increases, the predicted yield strength cr also increases. From an unpublished paper [16] sent to one of us, useful data had been consolidated from several sources [15,[17][18][19]. Most of those contents [16] were published subsequently [14] although the tabulated information we have used was not fully included in [14].…”

Section: Discussion On the Comparison Of Yield Criteriamentioning

confidence: 99%

The macroscopic yield behaviour of polymers

1973

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A yield criterion, not previously compared with the actual macroscopic behaviour of polymers, is herein compared with the pressure-modified octahedral shear stress criterion earlier suggested by others.This new relation, which is a version of the von Mises criterion, accommodates differences in tensile and compressive yield strengths and accounts for any dependence of yielding on the hydrostatic component of the applied stress state.With the use of thin-wall tubes accounting for the majority of experimental points, the yield behaviour of polycarbonate and polyvinylchloride was investigated. Besides these findings, results previously reported by others have also been utilized in this paper. Since these various studies employed quite different polymers, the excellent overall correlation of experiment with prediction should merit the serious attention of persons interested in the macroscopic yield behaviour of polymers.Comparisons between this new criterion and the modified octahedral shear stress are also made in regard to the effect of pressure on subsequent yield behaviour. Although not fully verified, it is suggested that the predictions which result using this new criterion, seem a little more reasonable.

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Section: Discussion On the Comparison Of Yield Criteriamentioning

confidence: 99%

The macroscopic yield behaviour of polymers

1973

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“…Contrary to metals, polymers yielding and failure are dependent on hydrostatic pressure, which is omitted in von Misses theory. Several experiments confirmed that hydrostatic part of stress tensor increases polymers yielding (Rabinowitz et al, 1970;Pae & Mears, 1968;Pugh et al, 1971) and failure (Ol'khovik, 1983) stress. That is why several modifications of Tresca and von Misses criteria were proposed to properly predict polymers behavior in the literature (Bowden & Jukes, 1972;Quinson et al, 1997;Sternstein & Ongchin 1969).…”

Section: Macroscopic Modelingmentioning

confidence: 67%

Nanocomposites for Vehicle Structural Applications

Njuguna¹,

Silva²,

Sachse³

2011

Nanofibers - Production, Properties and Functional Applications

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“…As regards the ductility or the fracture properties, the characteristics can vary from a material to the other one. For example, a pressure increase causes a decrease of the strain at failure for PTFE and linear PE [46] but an increase of this strain for POM (Fig. 2).…”

Section: Effect Of the Mean Stressmentioning

confidence: 99%

“…Studies quantified the effect of the hydrostatic pressure on various aspects of the mechanical behavior of PTFE and linear PE [46] as well as POM [47]. Tensile tests indicate that the hydrostatic pressure acts to increase Young's modulus and the yield stress.…”

Section: Effect Of the Mean Stressmentioning

confidence: 99%

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A Two-Phase Model for the Mechanical Behavior of Semicrystalline Polymers

Cangémi

Meimon

2001

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Un modèle biphasique pour le comportement mécanique des polymères semi-cristallins -L'utilisation croissante des polymères semi-cristallins (PSC) dans des structures industrielles complexes nécessite la mise au point de modèles de comportement mécanique fiables et prédictifs. Après avoir rappelé les différentes approches développées dans la littérature, nous présentons des résultats expérimentaux obtenus sur du PVDF et sur du PA11. Ceux-ci montrent que ces polymères sont sensibles à la contrainte moyenne et que leur déformation volumique, loin d'être négligeable, doit être prise en compte pour la modélisation du comportement du matériau. À partir des modèles mécaniques existant dans la littérature, on peut définir trois grandes classes de modélisation en fonction de l'échelle de représentation utilisée (micro, méso et macro) et de la nature des informations qu'elles permettent d'extraire de la microstructure. Il s'avère que l'adoption d'une échelle mésoscopique intermédiaire constitue un bon compromis entre difficultés théoriques et richesse de modélisation. Ce choix pragmatique s'appuie sur une représentation biphasique particulière de la microstructure des PSC. Elle permet d'effectuer une transition continue entre l'échelle mésoscopique et l'échelle macroscopique. L'utilisation de la thermodynamique des systèmes ouverts conduit à introduire une équation de couplage mécanique entre une phase solide (comprenant le cristal) et une phase dite « molle » ou « fluide » (essentiellement amorphe). Le modèle est ensuite complété par une formulation élastoviscoplastique permettant de décrire la variation de volume particulière des PSC, leur sensibilité à la vitesse de sollicitation et à la contrainte moyenne. La modélisation est confrontée aux résultats d'essais de traction effectués sur ces deux types de PSC utilisés dans l'industrie pétrolière.Mots-clés : polymères semi-cristallins, PA11, PVDF, essais de traction, essais de compression, fluage, relaxation, élastoviscoplasticité, thermodynamique des systèmes ouverts.Abstract -A Two-Phase Model for the Mechanical Behavior of Semicrystalline Polymers -The increasing use of semicrystalline polymers (SCP) in complex industrial structures, requires the development of reliable and predictive mechanical behavior models. The various approaches developed in the literature are considered and experimental results obtained from tests on PVF 2 and on PA11 are presented. These results show that these polymers are sensitive to the mean stress, and that the volume strain cannot be neglected and should be taken into account to model the material behavior. From the mechanical models existing in the literature, one can define three categories according to the scale of representation used (micro, meso and macro) and the information which they allow to extract from the microstructure. It turns out that the adoption of an intermediate meso-scale constitutes a good compromise between theoretical difficulties and richness of modeling. This pragmatic choice leans on a two-phase represen...

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The effects of high pressure on mechanical behavior and properties of polytetrafluoroethylene and polyethylene

Cited by 49 publications

References 2 publications

The macroscopic yield behaviour of polymers

The macroscopic yield behaviour of polymers

Nanocomposites for Vehicle Structural Applications

A Two-Phase Model for the Mechanical Behavior of Semicrystalline Polymers

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