A micromechanical study on the deformation kinetics of oriented semicrystalline polymers

Computational Materials Science

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Micromechanical modelling of reversible and irreversible thermo-mechanical deformation of oriented polyethylene terephthalate

Poluektov

Computational Materials Science

et al. 2015

Self Cite

“…Not only are these tapes highly anisotropic with a significant effect of the loading angle on the overall deformation behavior but also a large strain rate dependency exists, specifically when the sample is cut in the draw direction of the tape. The model, presented in this study, therefore extends the model developed by Sedighiamiri et al ., which was used for isotropic high‐density polyethylene (HDPE) and oriented PE tapes possessing a highly oriented crystallographic structure . In this work, an anisotropic model, including different sources of anisotropy, namely anisotropic elasticity, an internal stress in the elastic network and anisotropic viscoplastic flow, is developed and incorporated into the micromechanical model.…”

Section: Introductionmentioning

confidence: 99%

“…The yield kinetics of initially isotropic PE was well described with this model. Sedighiamiri et al also investigated the possibility of using the previously developed models for initially oriented semicrystalline PE. In addition, it was studied whether oriented systems could be used for characterizing the properties of different crystallographic slip systems.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical modeling of anisotropic behavior of oriented semicrystalline polymers

Mirkhalaf

J Polym Sci B Polym Phys

et al. 2019

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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“…In Ref. , the composite inclusion model was used to describe the deformation kinetics of oriented HDPE and in Ref. , this model was extended with a pre‐stretched amorphous phase to simulate short‐term and long‐term behavior of the oriented PET film taking into account pre‐orientation.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical modeling of roll‐to‐roll processing of oriented polyethylene terephthalate films

Poluektov

J of Applied Polymer Sci

et al. 2016