Creep failure of polypropylene: experiments and constitutive modeling

Drozdov, Aleksey D.; Christiansen, Jesper de Claville

doi:10.1007/s10704-009-9384-x

Cited by 17 publications

(17 citation statements)

References 44 publications

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“…18 1) and (32), it was postulated that the coefficients r y1 and S 1 (that determine slopes of appropriate curves in semi-logarithmic coordinates) coincided. This statement was confirmed for PP in Drozdov and Christiansen (2009) by comparison of experimental data in tensile tests with results of numerical analysis for long-term creep tests.…”

Section: Long-term Creep Testssupporting

confidence: 54%

Viscoelasticity and viscoplasticity of polypropylene/polyethylene blends

Drozdov

Christiansen

Klitkou

et al. 2010

International Journal of Solids and Structures

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a b s t r a c tObservations are reported on polypropylene/polyethylene blends with various concentrations of components in uniaxial tensile tests with constant strain rates, relaxation tests, and creep tests at room temperature. A model is developed for the viscoelastic and viscoplastic responses of polymer blends at arbitrary three-dimensional deformation with small strains. Material constants in the constitutive equations are determined by fitting the experimental data. It is found that all adjustable parameters evolve with blend composition following an analog of the rule of mixture. Lifetime of blends under condition of creep rupture is evaluated by numerical simulation.

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Section: Long-term Creep Testssupporting

confidence: 54%

Viscoelasticity and viscoplasticity of polypropylene/polyethylene blends

Drozdov

Christiansen

Klitkou

et al. 2010

International Journal of Solids and Structures

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show abstract

“…We do not dwell on the accuracy of matching the experimental dependence a 1 ð _ Þ by Eq. (49) as such an analysis has previously been performed in Drozdov and Christiansen (2009). Afterwards, simulation of the stress-strain relations is conducted for creep tests with stresses r = 70, 80, and 90 MPa.…”

Section: Nonlinear Viscoelastic Phenomena and Effect Of Strain Ratementioning

confidence: 99%

“…24 proceed to monotonically grow with number of cycles and do not demonstrate a strong upturn typical of observations in tests with smaller values of r min . An attempt to describe all stages of the creep process within a unified constitutive model has been undertaken by Drozdov and Christiansen (2009). Incorporation of that approach into the present model seems reasonable, but it requires detailed information about evolution of relaxation spectrum under cyclic deformation.…”

Section: Nonlinear Viscoelastic Phenomena and Effect Of Strain Ratementioning

confidence: 99%

Cyclic viscoelastoplasticity and low-cycle fatigue of polymer composites

Drozdov

2011

International Journal of Solids and Structures

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a b s t r a c tObservations are reported on a polymer composite (polyamide-6 reinforced with short glass fibers) in tensile relaxation tests with various strains, tensile creep tests with various stresses, and cyclic tests with a stress-controlled program (ratcheting with a fixed maximum stress and various minimum stresses). Constitutive equations are developed in cyclic viscoelastoplasticity of polymer composites. Adjustable parameters in the stress-strain relations are found by fitting observations in relaxation tests and cyclic tests (16 cycles of loading-unloading). It is demonstrated that the model correctly predicts experimental data in creep tests and dependencies of maximum and minimum strains per cycle on number of cycles up to fatigue fracture of specimens. The influence of strain rate and minimum stress on number of cycles to failure is studied numerically.

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“…Jahren et al developed a model to predict pH dependent equilibrium swelling behavior of polyelectrolyte chitosan by using Flory and Tanaka swelling theory, however the absolute degree of swelling from the model was higher than found experimentally. Drozdov et al . derived a model for the elastic response of polyelectrolyte gels.…”

Section: Introductionmentioning

confidence: 99%

“…Hamzavi et al . proposed a model to capture the inhomogeneous swelling of the dual stimuli‐responsive core‑shell microgels with extending the model for pH‐responsive hydrogels by Drozdov …”

Section: Introductionmentioning

confidence: 99%

Dual stimuli responsive neutral/cationic polymers/clay nanocomposite hydrogels

Amjadi

Sirousazar

Kokabi

2019

J of Applied Polymer Sci

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In this work, a thermodynamic‐based equilibrium‐swelling model was proposed to predict the swelling process of neutral/cationic polymers‐clay nanocomposite hydrogels sensitive to dual stimuli temperature and pH. Indeed, the new swelling model can estimate the effect of the rigid clay nanoparticles component on swelling behavior of blend nanocomposite hydrogels. The mixing term in model was developed based on lattice theory by considering the effects of solvent‐polymers, solvent‐clay, and polymer‐clay interaction parameters. The influence of the ionic groups of the clay layers and cationic polymer on the swelling was also taken into account in the proposed model. The model was verified by preparation of polyvinyl alcohol/chitosan/montmorillonite intelligent nanocomposite hydrogel by tripolyphosphate crosslinking method followed by freezing–thawing process. It was found that it could give good prediction for the equilibrium swelling of polymer‐clay nanocomposite hydrogels in the case of phantom network, especially where the swelling temperature and clay loading level are high and the pH of swelling medium is low. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48797.

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Creep failure of polypropylene: experiments and constitutive modeling

Cited by 17 publications

References 44 publications

Viscoelasticity and viscoplasticity of polypropylene/polyethylene blends

Viscoelasticity and viscoplasticity of polypropylene/polyethylene blends

Cyclic viscoelastoplasticity and low-cycle fatigue of polymer composites

Dual stimuli responsive neutral/cationic polymers/clay nanocomposite hydrogels

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