Viscoelastic material characterization and modeling for polyethylene

Popelar, C. H.; Kenner, Vernal H.

doi:10.1002/pen.760301004

Cited by 98 publications

(41 citation statements)

References 6 publications

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“…However, these mechanical properties are very complicated and have not been sufficiently described yet applying a usual viscoelastic theory. This is because semicrystalline polymers such as polyethylene exhibit a marked deviation from linear viscoelastic behavior even at small strains [1][2][3][4][5] . It has been identified that plastic deformation, such as dislocation, microvoid formation, and the slippage of crystallites, can arise from any applied deformation [6][7][8] and that anharmonic elastic response can be caused by mechanical and thermal excitations 9,10) .…”

Section: Introductionmentioning

confidence: 99%

Prediction of stress-relaxation behavior in high density polyethylene solids

Nitta¹,

Suzuki

1999

Macromol. Theory Simul.

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SUMMARY: The stress-relaxation behavior of a high density polyethylene solid was investigated using a nonlinear viscoelastic model in which two nonlinear parameters such as the anharmonicity in elastic response and the plastic deformation are introduced into a generalized Maxwell model. The determination of the nonlinear parameters demands the transient modulus data under a constant rate of deformation. The nonlinear viscoelastic model developed from the tensile behavior was found to predict the stress-relaxation behavior in the nonlinear region.

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Section: Introductionmentioning

confidence: 99%

Prediction of stress-relaxation behavior in high density polyethylene solids

Nitta¹,

Suzuki

1999

Macromol. Theory Simul.

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“…The shift factor obeys to the WilliamLandel-Ferry (or WLF) equation [7]. In fact, this method is relevant with many amorphous polymers but is not appropriate with semicrystalline thermoplastics for which the time-temperature superposition principle is not valid [8].…”

Section: Introductionmentioning

confidence: 99%

Creep behavior of high density polyethylene after aging in contact with different oil derivates

Habas-Ulloa¹,

d’Almeida²,

Habas³

2010

Polymer Engineering & Sci

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The creep behavior of a high density polyethylene (HDPE), currently used as raw material for pipe manufacture, was evaluated before and after exposure to oil derivates using transient rheometry. The creep behavior of the original HDPE was satisfactorily described using a generalized Kelvin-Voigt model based on two retardation times. The values of these critical times were quite different from each other, indicating a large distribution of macromolecular weight. The aging procedure was performed by immersing the polymer in two model fluids chosen to discriminate and understand the action of aromatic and paraffinic fractions of fuel derivatives (white oil, gas-oil). The batch operation was also carried out at two different temperatures to investigate the thermal activation of plausible degrading mechanisms. In the case of the aging performed in the paraffinic fluid, the polymer compliance continuously increased with the immersion duration. This behavior was attributed to a plasticization induced by the diffusion of the liquid in the polymer matrix. The same phenomenon was observed in the early stage of the HDPE aging carried out with the aromatic fluid.

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“…[71][72][73] ) or fracture toughness vs. time to fracture data, [58][59][60] respectively, as functions of temperature or loading speed can be brought into superposition (master curves), using Arrhenius-type shift factors obtained by deformation measurements at small amplitudes. [9,15,[74][75][76][77][78] Quantitative Correlations According to Ramsteiner, quantitative correlations between mechanical damping determined by using DMA and the impact strength should not be expected in the whole range of temperature, because DMA probes the range of linear viscoelasticity, whereas the impact test probes the range of non-linear viscoelasticity and processes of damage. [38] (Notwithstanding, the validity of some aspects of the time/temperature superposition principle can be extended to the fracture process, as shown above).…”

Section: Arrhenius Diagrammentioning

confidence: 99%

Time‐ and Temperature‐Dependent Fracture Mechanics of Polymers: General Aspects at Monotonic Quasi‐Static and Impact Loading Conditions

Lach

Grellmann

2008

Macro Materials & Eng

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Well‐defined correlations exist between the maxima in mechanical loss factor and the local maxima in temperature‐ or loading‐speed‐dependent fracture toughness. The non‐linear viscoelastic fracture processes and small‐strain deformations are characterised by the same Arrhenius‐type activation enthalpies. The local increase in toughness is linearly correlated with the relaxation strength of molecular relaxation processes. Stable crack propagation can be understood as a three‐phase process resulting in steady‐state stable crack growth. The normalised steady‐state crack‐tip‐opening displacement is independent of matrix material, temperature and loading speed.magnified image

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Viscoelastic material characterization and modeling for polyethylene

Cited by 98 publications

References 6 publications

Prediction of stress-relaxation behavior in high density polyethylene solids

Prediction of stress-relaxation behavior in high density polyethylene solids

Creep behavior of high density polyethylene after aging in contact with different oil derivates

Time‐ and Temperature‐Dependent Fracture Mechanics of Polymers: General Aspects at Monotonic Quasi‐Static and Impact Loading Conditions

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