Cyclic viscoplasticity of high-density polyethylene: Experiments and modeling

Drozdov, Aleksey D.; Christiansen, Jesper de Claville

doi:10.1016/j.commatsci.2006.07.014

Cited by 56 publications

(32 citation statements)

References 49 publications

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“…Application of these ideas for modeling of multicycle deformation behavior of semicrystalline polymers requested to adapt parameters governing intensity of intra-and inter-lamellae plastic flow [100,103,111,140]. To this end, plastic deformation rate of crystalline lamellae _ e p2 was suggested to be considered as a linear function _ e p2 ¼ wr 0 of the deviatoric component r 0 of the macroscopic stress tensor [103,111].…”

Section: Global Deformation Behavior Of Semicrystalline Polymersmentioning

confidence: 99%

“…Semicrystalline polymers are often considered as structureless homogeneous continuum with different phenomenological assumptions on the mechanisms and kinetics of plastic deformation [98][99][100][101][102][103][104][105][106][107]. However, structural properties are treated implicitly in this approach.…”

Section: Modeling Of Small-strain Deformation Behavior Of Semicrystalmentioning

confidence: 99%

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Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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The review focuses on the current studies of the deformation response and accompanying structural transformations of thermoplastic semicrystalline polymers subjected to uniaxial tension prior to the yield point. The mechanisms of strain-induced cavitation of amorphous layers and damages of crystalline lamellae are analyzed in line with novel results on the deformation behavior of solid polymers at temperatures exceeding the glass transition point. The coupling of viscoelastic and plastic deformation mechanisms with the small-strain structural transformations is critically discussed on the basis of the advanced theoretical modeling of mechanical properties of semicrystalline polymers.

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Section: Global Deformation Behavior Of Semicrystalline Polymersmentioning

confidence: 99%

Section: Modeling Of Small-strain Deformation Behavior Of Semicrystalmentioning

confidence: 99%

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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“…The value of the elastic constant μ Fig. 3 (a): Tensile stress-strain curves in a cyclic test with ε max = 0.025, after Drozdov and Christiansen (2007a); (lines) model simulation. (b): Model simulation of the experimental data of (a) (a) (b) was taken from Christiansen (2007a, 2007b) and was equal to 1400 MPa.…”

Section: Strain Controlled Programmentioning

confidence: 99%

Modeling of viscoplastic cyclic loading behavior of polymers

Spathis

Kontou

2015

Mech Time-Depend Mater

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A new theoretical approach, analyzed in previous works, is employed for the description of the nonlinear viscoelastic/viscoplastic response of high density polyethylene under tensile cyclic loading, experimentally studied elsewhere. The proposed analysis, developed for a 3-D problem, is applied for a uniaxial cyclic deformation, in a strain-controlled program, where tensile loading up to maximum strain is followed by unloading to zero stress. This procedure is repeated for ten cycles. The same model is also applied for the simulation of a stress-controlled program, where cyclic loading takes place between a σ max and σ min engineering stress. The hysteresis loops of both programs could be adequately captured, with a number of model parameters, related to both, nonlinear viscoelasticity and viscoplasticity. The simulated ratcheting strain as well as its evolution with number of cycles is a very good approximation of the experimental one. A systematic study of the values of the adjustable parameters has been performed in order to monitor the effect of every specific internal variable, responsible for either the nonlinear viscoelastic or viscoplastic path in the simulations. It was found that in the proposed analysis a rather low number of model parameters are required, compared to the works existing in the literature.

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“…A nanocomposite with a complicated microstructure (a semicrystalline matrix reinforced with randomly distributed clay platelets and their stacks) is replaced with an equivalent isotropic medium, whose mechanical response resembles that of the hybrid. An incompressible, inhomogeneous, transient, non-affine network of chains bridged by junctions is chosen as the equivalent continuum (Drozdov and Christiansen 2007).…”

Section: Appendix: Constitutive Modelmentioning

confidence: 99%

“…A number of studies dealt in the past five years with the viscoelastoplastic behavior of polymers and polymer composites subjected to cyclic loading (Drozdov and Christiansen 2007;Yakimets et al 2007;Sullivan 2008;Drozdov 2009;Mizuno and Sanomura 2009;Ayoub et al 2010;Bouchart et al 2010). The stress-strain relations developed in those works were confined, however, to the description of the first cycle of loading-unloading and could not be applied directly to fitting observations in multi-cycle tests.…”

mentioning

confidence: 99%

Cyclic viscoelastoplasticity of polypropylene/nanoclay composites

Drozdov

Christiansen

2012

Mech Time-Depend Mater

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Observations are reported on isotactic polypropylene/organically modified nanoclay hybrids with concentrations of filler ranging from 0 to 5 wt.% in cyclic tensile tests with a stress-controlled program (oscillations between various maximum stresses and the zero minimum stress). A pronounced effect of nanofiller is demonstrated: reinforcement with 2 wt.% of clay results in strong reduction of maximum and minimum strains per cycle and growth of number of cycles to failure compared with neat polypropylene. To rationalize these findings, a constitutive model is developed in cyclic viscoelasticity and viscoplasticity of polymer nanocomposites. Adjustable parameters in the stress-strain relations are found by fitting experimental data. The model correctly describes the growth of the ratcheting strain and shows that fatigue failure is driven by a pronounced increase in plastic strain in the crystalline phase. To assess the influence of loading conditions on the changes in the material parameters, experimental data on polypropylene are studied in cyclic tests with a strain-controlled program (oscillations between fixed maximum and minimum strains) and a mixed program (oscillations between various maximum strains and the zero minimum stress). Numerical simulation confirms the ability of the model to predict the evolution of stress-strain diagrams with the number of cycles.

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Cyclic viscoplasticity of high-density polyethylene: Experiments and modeling

Cited by 56 publications

References 49 publications

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Modeling of viscoplastic cyclic loading behavior of polymers

Cyclic viscoelastoplasticity of polypropylene/nanoclay composites

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