A new protocol for accelerated screening of long-term plasticity-controlled failure of polyethylene pipe grades

Kanters, Marc J.W.; Remerie, Klaas; Govaert, Leon Le

doi:10.1002/pen.24294

Cited by 29 publications

(62 citation statements)

References 48 publications

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“…All curves in Figure a demonstrate a strict power‐law behavior with a slope −1, indicating that each curve is well described by a single value of critical strain, irrespective of the occurrence of progressive aging. It should be noted that we observe a considerable variation in the critical strain as a function of temperature; similar observations were made on other semicrystalline polymers like PE . Hence, to improve the lifetime predictions, the critical strain has been optimized for each temperature.…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that we observe a considerable variation in the critical strain as a function of temperature; similar observations were made on other semicrystalline polymers like PE. [49] Hence, to improve the lifetime predictions, the critical strain has been optimized for each temperature. This allows the description of the time-tofailure under static load including the evolution of the thermodynamic state by effectively integrating Equation (12) where the plastic strain rate evolves as a result of temperature and stress induced progressive aging until the critical strain is reached (see solid drawn lines in Figure 19d):…”

Section: Lifetime Predictions and Endurance Limit Estimationmentioning

confidence: 99%

“…For many polymer systems, both glassy and semicrystalline, unfilled and fiber reinforced, it has been demonstrated that, at the same value of the maximum load, application of a high amplitude cyclic load will promote crack‐growth and drastically reduce the failure time compared to that observed in static loading . In the case of polymers with a very high resistance to crack growth, it is, nevertheless, not uncommon that crack‐growth dominated failure is not observed during characterization experiments; a prime example being the absence of crack‐growth dominated failure in current polyethylene (PE) pipe grades during certification testing . The fact that crack‐growth dominated failure is not observed during static tests of over a year only implies that the material is very crack resistant; it will definitely appear at lower loads and longer loading times.…”

Section: Introductionmentioning

confidence: 99%

“…[42,48] In the case of polymers with a very high resistance to crack growth, it is, nevertheless, not uncommon that crack-growth dominated failure is not observed during characterization experiments; a prime example being the absence of crack-growth dominated failure in current polyethylene (PE) pipe grades during certification testing. [49,50] The fact that crack-growth dominated failure is not observed during static tests of over a year only implies that the material is very crack resistant; it will definitely appear at lower loads and longer loading times. Consequently, an endurance limit observed in plasticity-controlled failure is nothing more than that; below the endurance threshold no plasticity-controlled failure will occur, but crack-growth dominated failure is still inevitable.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Physical background of the endurance limit in poly(ether ether ketone)

Pastukhov

Kanters

Engels

et al. 2020

Journal of Polymer Science

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In this study, it is demonstrated that the apparent endurance (fatigue) limit for plasticity‐controlled failure in poly(ether ether ketone) is related to an evolution of the yield stress. The increase of the yield stress has two separate causes: (a) stress‐ and temperature‐accelerated physical aging of the amorphous phase and (b) strain hardening as a result of texture development. Yield stress evolution is monitored using thermomechanical treatments during which the material is exposed to temperature and load. The combined contributions of both temperature and applied stress to yield stress evolution (below T g) can be effectively modeled using an effective time approach employing an Arrhenius temperature‐activation as well as Eyring stress activation. Combination of the yield stress evolution with a previously developed model for plasticity‐controlled failure allows prediction of time‐to‐failure under both static and cyclic load, quantitatively capturing the observed apparent endurance limit.

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Section: Resultsmentioning

confidence: 99%

Section: Lifetime Predictions and Endurance Limit Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physical background of the endurance limit in poly(ether ether ketone)

Pastukhov

Kanters

Engels

et al. 2020

Journal of Polymer Science

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“…In eq 36, p a is the hydrostatic pressure of the amorphous phase. Kanters et al 24 compared this approach with one that involves separate kinematics for the two relaxation processes and found that there is only a small difference between the aforementioned approaches.…”

Section: Amorphous Phase Constitutive Modelmentioning

confidence: 99%

Micromechanical modeling of anisotropic behavior of oriented semicrystalline polymers

Mirkhalaf

Dommelen

Govaert

et al. 2019

J Polym Sci B Polym Phys

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Some manufacturing processes of polymeric materials, such as injection molding or film blowing, cause the final product to be highly anisotropic. In this study, the mechanical behavior of drawn polyethylene (PE) tapes is investigated via micromechanical modeling. An elasto‐viscoplastic micromechanical model, developed within the framework of the so‐called composite inclusion model, is presented to capture the anisotropic behavior of oriented semicrystalline PE. Two different phases, namely amorphous and crystalline (both described by elasto‐viscoplastic constitutive models), are considered at the microstructural level. The initial oriented crystallographic structure of the drawn tapes is taken into account. It was previously shown by Sedighiamiri et al. (Comp. Mater. Sci. 2014, 82, 415) that by only considering the oriented crystallographic structure, it is not possible to capture the macroscopic anisotropic behavior of drawn tapes. The main contribution of this study is the development of an anisotropic model for the amorphous phase within the micromechanical framework. An Eindhoven glassy polymer (EGP)‐based model including different sources of anisotropy, namely anisotropic elasticity, internal stress in the elastic network and anisotropic viscoplasticity, is developed for the amorphous phase and incorporated into the micromechanical model. Comparisons against experimental results reveal remarkable improvements of the model predictions (compared to micromechanical model predictions including isotropic amorphous domains) and thus the significance of the amorphous phase anisotropy on the overall behavior of drawn PE tapes. © 2019 The Authors. Journal of Polymer Science Part B: Polymer Physics published by Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 378–391

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Prediction of plasticity‐controlled failure in polyamide 6: Influence of temperature and relative humidity

Parodi

Peters

Govaert

2017

J of Applied Polymer Sci

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In this study, the influence of temperature and relative humidity on the plasticity controlled failure of polyamide 6 was investigated. Uniaxial tensile tests were performed at several temperatures, strain rates, and relative humidity; creep tests were performed at different relative humidity and applied load. In order to describe and predict the yield kinetics, the Ree–Eyring equation was employed and modified to include the effect of relative humidity. Subsequently, by the introduction of the concept of critical amount of accumulated plastic strain, the yield kinetics were successfully translated to predictions of time‐to‐failure. A good agreement between predictions and experimental results is obtained, showing that the model is a suitable and versatile tool to evaluate mechanical performance of a temperature and moisture sensitive material such as polyamide 6. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45942.

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A new protocol for accelerated screening of long-term plasticity-controlled failure of polyethylene pipe grades

Cited by 29 publications

References 48 publications

Physical background of the endurance limit in poly(ether ether ketone)

Physical background of the endurance limit in poly(ether ether ketone)

Micromechanical modeling of anisotropic behavior of oriented semicrystalline polymers

Prediction of plasticity‐controlled failure in polyamide 6: Influence of temperature and relative humidity

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