Abstract
ABSTRACTSome 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
Highlights
Polymers have become an important and highly applicable type of materials due to their interesting chemical, optical, thermal and mechanical properties
The goal of this study is to model the mechanical behaviour of hot drawn PE tapes
The model, presented in this study, extends the model developed by Sedighiamiri et al.[10,11], which was used for isotropic high density Polyethylene (HDPE) and oriented PE tapes possessing a highly oriented crystallographic structure[1]
Summary
Polymers have become an important and highly applicable type of materials due to their interesting chemical, optical, thermal and mechanical properties. Parks and Ahzi[3] developed a fully crystalline micro-mechanical rigid-viscoplastic model (named Constrained Hybrid (CH) model) to describe the deformation behaviour and texture evolution of polycrystalline materials. Sedighiamiri et al.[1] investigated the possibility of using the previously developed models[10,11] for initially oriented semi-crystalline PE It was studied whether oriented systems could be used for characterizing the properties of different crystallographic slip systems. 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 micro-mechanical model. Section explains various sources of anisotropy in oriented PE tapes and describes the anisotropic model for the amorphous phase, including an internal stress into the elastic network, an anisotropic viscoplastic flow rule and anisotropic elasticity.
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