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Deformation of spherulitic semi-crystalline polymers: phase field – mechanic coupling

Abstract : Semi-cristalline poymers (SCPs) such as High-Density-Poly-Ethylenes (HDPE) present a spherulitic microstructure. During mechanical loading micro-mechanisms of deformation in spherulites and their effect on the macroscopic response have to be clarified. We intend to use the AMITEX code [1] developed at CEA Saclay, firstly to solve the local mechanical equations on such a complex microstructure, and secondly, to couple it with a modelling approach of phase transformation type to explore the thereby opened simulation paths allowing for a better understanding of the damaging processes which explain the macroscale behaviour. The AMITEX code is based on an FFT method [2] and takes into account behaviour laws in UMAT format. To describe mechanical behaviour of crystal-amorphous two-phase spherulite structure we created a UMAT with a transversal isotropic law based on a DLR model [3]. This model allows predicting the local and overall behaviour between amorphous isotropic viscoelastic regions and orthotropic elastic crystallites accounting for their radial arrangement from spherulites centers. A phase field model was developed in AMTEX source code to describe phase changes in crystal-amorphous two-phase arrangements during loading. First computations of behaviour using the mechanical model coupled with the phase field method reveal a deterioration of crystal phases and crystal/amorphous interactions occurring during strain which can now be investigated more deeply with respect to the model parameters.
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https://hal.univ-lorraine.fr/hal-03193555
Contributor : Julien Boisse <>
Submitted on : Thursday, April 8, 2021 - 10:13:03 PM
Last modification on : Friday, April 9, 2021 - 3:21:28 AM

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  • HAL Id : hal-03193555, version 1

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Marc Cornu, Julien Boisse, Stéphane André. Deformation of spherulitic semi-crystalline polymers: phase field – mechanic coupling. Virtual Congress 14th World Congress on Computational Mechanics (WCCM) & European Community on Computational Methods in Applied Sciences (ECCOMAS) 2020, Jan 2021, Paris, France. ⟨hal-03193555⟩

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