Constitutive modelling of viscoelastic unloading of short glass fibre-reinforced polyethylene

Rémond, Yves

doi:10.1016/j.compscitech.2004.09.010

Cited by 27 publications

(11 citation statements)

References 10 publications

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“…On the other hand, they usually involve numerous material parameters (especially in case of anisotropy), the identification of which being possibly tricky and fastidious. This approach has thus not been very applied to SGFR polymers, and works regarding the use of phenomenological models for this kind of material are often limited to random orientation of the short fibers [20][21][22][23]. However, [24] have proposed a phenomenological viscoelastic-viscoplastic model for the nonlinear response, in which the viscoplastic flow is formulated according to the fiber orientation tensor.…”

Section: Cyclic Behavior: Scale Transition Methods or Macroscopic Modementioning

confidence: 97%

Multiaxial fatigue models for short glass fiber reinforced polyamide – Part I: Nonlinear anisotropic constitutive behavior for cyclic response

Launay

Maitournam

Marco

et al. 2013

International Journal of Fatigue

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a b s t r a c tComponents made of short glass fiber reinforced (SGFR) thermoplastics are increasingly used in the automotive industry, and more frequently subjected to fatigue loadings during their service life. The determination of a predictive fatigue criterion is therefore a serious issue for the designers, and requires the knowledge of the local mechanical response under a large range of environmental conditions (temperature and relative humidity). As the cyclic behavior of polymeric material is reckoned to be highly nonlinear, even at room temperature, an accurate constitutive model is a preliminary step for confident fatigue design.The injection molding process induces a complex fiber orientation distribution (FOD), which affects both the mechanical response and the fatigue life of SGFR thermoplastics. This paper presents an extension of the constitutive behavior proposed by the authors in a previous work [Launay et al., Int J Plasticity, 2011], in order to take into account the influence of the local FOD on overall anisotropic elastic and viscoplastic properties. The proposed model is written in a general 3D anisotropic framework, and is validated on tensile samples with various FOD and loading histories: monotonic tensions, creep and/or relaxation steps, cyclic loadings. In Part II of this paper [Launay et al., Int J Fatigue, 2012], this constitutive model will be applied to the simulation of different fatigue samples subjected to multiaxial cyclic loadings.

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Section: Cyclic Behavior: Scale Transition Methods or Macroscopic Modementioning

confidence: 97%

Multiaxial fatigue models for short glass fiber reinforced polyamide – Part I: Nonlinear anisotropic constitutive behavior for cyclic response

Launay

Maitournam

Marco

et al. 2013

International Journal of Fatigue

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“…In the past decade, the time-and rate-dependent responses of polyethylenes at ambient conditions, as well as at elevated temperatures have been studied in a number of publications, see Zhang and Moore (1997), Nitta and Suzuki (1999), Beijer and Spoormaker (2000), Djokovic et al (2000), Pegoretti et al (2000), Mano et al (2001), van Dommelen et al (2003), Dasari and Misra (2003), Bergstrom et al (2004), Hong et al (2004), Remond (2005), Mrabet et al (2005), Nikolov et al (2006), Colak and Dusunceli (2006), Elleuch and Taktak (2006), Christiansen (2007a,b), andBen Hadj Hamouda et al (2007), to mention a few. Although several variants of constitutive equations have been proposed for the viscoelastic and viscoplastic behavior of semi-crystalline polymers that reveal an acceptable agreement with observations, these models share common shortcomings: (i) they disregard thermally-induced evolution of microstructure of HDPE in the vicinity of a-relaxation point (in the interval of temperatures between 60 and 80°C), and (ii) their application to fitting observations results in rather high values of the apparent activation energy of solid polyethylene (in the interval between 100 and 200 kJ/mol) which substantially exceed those for polyethylene melts [20-30 kJ/mol (Bin Wadud and Baird, 2000)] and are close to the activation energies for thermal degradation of high-density polyethylene [ranging between 200 and 300 kJ/ mol (Sinfronio et al, 2005;Marazzato et al, 2007)].…”

Section: Introductionmentioning

confidence: 99%

Thermo-viscoelastic and viscoplastic behavior of high-density polyethylene

Drozdov

Yuan

2008

International Journal of Solids and Structures

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a b s t r a c tObservations are reported on high-density polyethylene in uniaxial tensile tests with constant strain rates and relaxation tests at various temperatures ranging from 25 to 90°C. A constitutive model is derived for the nonlinear viscoelastic and viscoplastic behavior of semi-crystalline polymers at three-dimensional deformations. Adjustable parameters in the stress-strain relations are found by fitting the experimental data. It is demonstrated that (i) the model correctly approximates the observations and (ii) material parameters are independent of strain rate and change consistently with temperature.

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“…Application of the hardening concept to modeling the mechanical response of polymers was initiated by Krempl and his group (Ho and Krempl, 2002;Krempl and Khan, 2003), but fitting of a loadingretraction curve (one cycle only) on polyphenylene oxide by a model with 12 adjustable parameters revealed rather poor agreement with experimental data and an additional improvement of the model was necessary (Colak, 2005). For a comparison of several versions of models with isotropic and kinematic hardening and a discussion of their ability to fit data on polyethylene reinforced with short glass fibers, see Remond (2005).…”

Section: Introductionmentioning

confidence: 98%

Cyclic deformation of ternary nanocomposites: Experiments and modeling

Drozdov

Christiansen

2007

International Journal of Solids and Structures

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Observations are reported on the mechanical response of a ternary composite (blend of polypropylene and a thermoplastic elastomer reinforced with montmorilonite nanoclay) at cyclic tensile deformations with relatively large amplitudes (up to the necking point). Constitutive equations for the viscoplastic behavior of hybrid nanocomposites are derived by using the laws of thermodynamics. Adjustable parameters in the stress-strain relations are found by fitting the experimental data. It is demonstrated that the model adequately predicts stress-strain diagrams of the nanocomposite under cyclic loading.

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Constitutive modelling of viscoelastic unloading of short glass fibre-reinforced polyethylene

Cited by 27 publications

References 10 publications

Multiaxial fatigue models for short glass fiber reinforced polyamide – Part I: Nonlinear anisotropic constitutive behavior for cyclic response

Multiaxial fatigue models for short glass fiber reinforced polyamide – Part I: Nonlinear anisotropic constitutive behavior for cyclic response

Thermo-viscoelastic and viscoplastic behavior of high-density polyethylene

Cyclic deformation of ternary nanocomposites: Experiments and modeling

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