True intrinsic mechanical behaviour of semi-crystalline and amorphous polymers: Influences of volume deformation and cavities shape

Ponçot, Marc; Addiego, Frédéric; Dahoun, Abdesselam

doi:10.1016/j.ijplas.2012.07.007

Cited by 58 publications

(40 citation statements)

References 52 publications

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“…Except for the deformation temperature, strain rate also plays an important role in governing the initiation of cavitation before fibrillation process. Addiego et al., Poncot et al., and Balieu et al . studied the influence of strain rate on the deformation process of polymers independently.…”

Section: Macroscopic Phenomena Of Cavitation‐induced Stress Whiteningmentioning

confidence: 95%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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Cavitation‐induced stress whitening in semi‐crystalline polymers during stretching significantly influences the physical properties of the materials. This review summarizes studies focusing on two different cavitation processes triggered at small and large strain regimes. The corresponding mechanisms of these two cavitation processes are discussed. For cavitation activated at small strain, there are two basic but distinctly different models with the initiation of cavities either in the amorphous phase or in the crystalline skeleton. For the cavitation triggered at a large strain regime, there are also two different arguments being either due to the defects located in the ends of micro‐fibrils or as a consequence of the fragmentation of load‐bearing inter‐fibril/micro‐fibril tie chains in highly oriented amorphous networks. A unified understanding of the cavitation processes during stretching semi‐crystalline polymers based on interpenetrated network model is proposed. Finally, this review outlooks future research topics for better understanding the cavitation mechanism to meet the industrial need.

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Section: Macroscopic Phenomena Of Cavitation‐induced Stress Whiteningmentioning

confidence: 95%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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“…First models are based on mixture theory that combines the behavior of crystalline and amorphous phases, whereas microstructure is much more complex than a blend of two phases and whereas role of tight molecules are known to be of prime importance. Constitutive equations were mainly proposed to account for macroscopic characteristics such as crystal volume fraction (see for instance). Another approach is based on models consistent with continuum mechanics (among others) in which global behavior is ruled by energy potentials and dissipation pseudo‐potentials that depends on postulated internal state variables.…”

Section: Introductionmentioning

confidence: 99%

Modeling of time dependent mechanical behavior of polymers: Comparison between amorphous and semicrystalline polyethylene terephthalate

Gehring

Bouvard

Billon

2016

J of Applied Polymer Sci

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International audienceRevisited network theory to account for inelasticity1,2 was used to model behavior of amorphous and semicrystalline PET. Semicrystalline materials were obtained through cold crystallization of the amorphous one making the crystalline microstructure the only difference. The model considers microstructure at a mesoscopic level through the description of an equivalent network evolving with internal state variables. Inelastic phenomena are assumed to result from the evolution of entanglements and of density of weak bond between adjacent chains (van der Walls or H-bond, etc.). The experiment data base included nonmonotonic tensile test coupled with synchronized digital image correlation and infrared measurement device for capturing the time and temperature dependence of the material. Model show a pretty good ability to reproduce time dependent behavior of the two materials. Analysis of the parameters also shows a coherent evolution with the microstructure though this latter is not explicitly accounted for in the model. Further study will make relationship between microstructure and parameters cleare

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“…Such models focused on capturing the heterogeneous nature of the SCP microstructure at different scales (at the lamellae, at the spherulite, or at the continuum level) as well as the material dependence to the external loading conditions (such as strain rate, temperature, and/or strain path). Therefore, constitutive equations were proposed to account for the material internal microstructure (such as crystal volume fraction) (see Kennedy et al (1994), Lee et al (2003), Rozanski and Galeski (2013), Ponçot et al (2013), among others). We can also refer to the previously cited VBO model that was extended to SCP by incorporating information regarding the degree of crystallinity (Dusunceli and Colak (2008)).…”

Section: Introductionmentioning

confidence: 99%

A thermo-mechanical large deformation constitutive model for polymers based on material network description: Application to a semi-crystalline polyamide 66

Maurel-Pantel

Baquet

Bikard

et al. 2015

International Journal of Plasticity

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International audienceA visco-hyperelastic constitutive model, based on an original approach initially developed by (Billon, 2012) and applied to amorphous rubbery polymers for a one-dimensional formalism, was extended in this study to three-dimensional constitutive equations based on a thermodynamic framework. The model was applied to a semi-crystalline polyamide polymer, PA66. The experiments included tension and shear testing coupled with synchronized digital image correlation and infrared measurements device for capturing the time, temperature, and stress state dependence, as well as the complex thermomechanical coupling exhibited by the material under large deformation. A notion of equivalent strain rate (based on the time–temperature principle superposition) was also introduced to show its capability to build master curves and therefore decrease the number of testing needed to build a material database. The model is based on the Edward Vilgis theory (1986) and accounts for chains network reorganization under external loading through the introduction of an evolution equation for the internal state variable η, representing the degree of mobility of entanglement points. The model accounting for the equivalent strain rate notion was calibrated using master curves. The thermomechanical model agreed well with the experimental mechanical and temperature measurements under tension and shear conditions. The approach developed in this study may open a different way to model the polymer behavior

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True intrinsic mechanical behaviour of semi-crystalline and amorphous polymers: Influences of volume deformation and cavities shape

Cited by 58 publications

References 52 publications

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Modeling of time dependent mechanical behavior of polymers: Comparison between amorphous and semicrystalline polyethylene terephthalate

A thermo-mechanical large deformation constitutive model for polymers based on material network description: Application to a semi-crystalline polyamide 66

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