Creep Behavior Modeling of Polyoxymethylene (POM) Applying Rheological Models

Altenbach, Holm; Girchenko, Anna A.; Kutschke, Andreas; Naumenko, Konstantin

doi:10.1007/978-3-319-14660-7_1

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Alternatively, rheological models are widely applied to characterize the mechanical behavior of polymeric materials. In [11], a four-element rheological model is proposed to describe primary, secondary and tertiary creep stages of POM considering finite strains. In [12], a six-element rheological model is utilized to describe creep under both static and cyclic loadings.…”

Section: Introductionmentioning

confidence: 99%

Inelastic Behavior of Polyoxymethylene for Wide Strain Rate and Temperature Ranges: Constitutive Modeling and Identification

Filanova

Hauptmann²,

Längler³

et al. 2021

Materials

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The aim of this paper is to present experimental data and the constitutive model for the inelastic behavior of polyoxymethylene in wide strain rate and temperature ranges. To capture the non-linearity of the stress responses for both loading and unloading regimes, the composite model of inelastic deformation is utilized and further developed. The equivalent inelastic strain rate is described by the Prandtl–Eyring law, while the temperature dependence is characterized by the modified Arrhenius-type law. Generalized equivalent stress and the flow rule are formulated to capture pressure sensitivity, transverse strain and volumetric strain responses. The results obtained by the constitutive law are compared with experimental data for stress vs. axial strain from standard tension tests as well as with axial and transverse strains measured by digital image correlation. The developed composite model is able to capture the non-linearity of stress–strain curves for complex loading paths within the small strain regime. For higher strains, apart from geometrically non-linear theory, evolution laws for the volume fraction of the constituents should be modified and calibrated. For the small strain regime, the inelastic dilatation is negligible. For higher axial strain values, a decrease in Poisson’s ratio under tension and increase in it under compression are observed. The Drucker–Prager-type equivalent stress and the developed flow rule provide a better description of both the transverse and volumetric strains than that of the classical von Mises–Odqvist flow rules.

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Section: Introductionmentioning

confidence: 99%

Inelastic Behavior of Polyoxymethylene for Wide Strain Rate and Temperature Ranges: Constitutive Modeling and Identification

Filanova

Hauptmann²,

Längler³

et al. 2021

Materials

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“…The available literature primarily deals with the improved mechanical, wear and thermal behaviors of CNT/POM. So far, only a handful of research works has been published on the effect of rheological parameter variation by using rheometrics system (parallel or cone plates) and capillary viscometer . The evaluation of melt rheological properties of POM and its composites in terms of complex viscosity, storage modulus and loss modulus with angular frequency is important.…”

Section: Introductionmentioning

confidence: 99%

“…So far, only a handful of research works has been published on the effect of rheological parameter variation by using rheometrics system (parallel or cone plates) and capillary viscometer. [11][12][13][14][15][16] The evaluation of melt rheological properties of POM and its composites in terms of complex viscosity, storage modulus and loss modulus with angular frequency is important. However, the correlation of flexural, impact, rheology, thermal and wettability behaviors of CNT/POM is missing.…”

Section: Introductionmentioning

confidence: 99%

Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil

Yousef

Visco

Galtieri

et al. 2016

Polymers for Advanced Techs

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The paraffin oil dispersion technique innovated in the recent years to synthesize bulk polymer nanocomposite materials has a uniform dispersion. This research work aims to study the effect of added carbon nanotubes (CNTs) on flexural, impact and rheology behaviors of polyoxymethylene (POM) reinforced by 0–0.03 wt% of CNT using paraffin oil dispersion technique. The wettability and lamellar thickness were measured and rheological performance investigated using a parallel plate rheometer. The flexural and impact mechanical properties were also evaluated. The fracture surfaces were then examined by microscopy. The results showed that the energy to break, flexural strength and modulus increased proportionally with the addition of the amount of CNT in the matrix. For the rheology behavior, the viscosity decreased at the low percentage of CNT and then increased with increase in the percentage weight ratio of CNT in the POM matrix. It was also noted that the water contact angle rose with the increase the CNT percentages. Copyright © 2016 John Wiley & Sons, Ltd.

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Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

Starkova

Анискевич

Sevcenko

et al. 2020

J of Applied Polymer Sci

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An assessment of accumulated irreversible strains in polymer composites is a crucial element for controlling dimensional stability of structural components and their remnant life. The residual strains as functions of total creep strains are analyzed by example of creep-recovery data of polypropylene (PP)/multiwall carbon nanotube (MWCNT) composites. To cover wide range of strains, creep test regimes with different stresses, loading time, and number of cycles were applied. Totally, data of 62 single creep-recovery tests for 7 material compositions were used for analysis. A general empirical relationship between the residual and total creep strain is established and finely described by a power law. The residual strain increases with increasing stress and time of loading and decreases with growing amount of MWCNT. The total creep strain, which is implicitly related to stress, time, and sample specificity, determines the contribution of irreversible deformation. This fact overcomes data variability within one series of samples. Similar empirical relationships are obtained for 25 polymer composites from literature reinforced with different types and amount of fillers and tested under different temperatures. The empirical relationship can be used for an express assessment of residual strains accumulated in a long term by performing just a few short-term control tests.

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Creep Behavior Modeling of Polyoxymethylene (POM) Applying Rheological Models

Cited by 7 publications

References 17 publications

Inelastic Behavior of Polyoxymethylene for Wide Strain Rate and Temperature Ranges: Constitutive Modeling and Identification

Inelastic Behavior of Polyoxymethylene for Wide Strain Rate and Temperature Ranges: Constitutive Modeling and Identification

Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil

Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

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