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Communication Dans Un Congrès Année : 2016

Rate Growth Simulation of Spherulitic Microstructure of PET Induced by the Temperature Using the Phase Field Method

Résumé

Viscoelastic behavior of Polyethylene Terephthalate (PET) is strongly dependent on the microstructure, and reciprocally, the microstructure evolution depends on the mechanical stresses [1]. Especially crystalline ratio and molecular orientation are characteristics of the microstructure evolution that change during the mechanical behavior of PET and/or with thermal conditions [2]. We are interested to model these phenomena at the mesoscopic scale by using the phase field method [3]. A numerical simulation coupled between microstructure and thermo-mechanical has been implemented and will help to build a viscoelastic model for PET at the macroscopic scale. We present here the first results that concerns crystallization under thermal conditions with no strain our stress effects. Using a phase field variable and a corresponding governing equation to describe the state (solid or liquid) in a material as a function of space and time, using also the thermal equations for heat, the problem can be solved without tracking the liquid-solid interface. The interfacial regions between liquid and solid involve smooth but highly localized variations of the phase-field variable. Three different method of numerical simulation (Finite volume method, Finite difference method and Finite element method) have been applied to our problem.
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Dates et versions

hal-01644938 , version 1 (22-11-2017)

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Yang-Hao Gong, Yun Mei Luo, Luc Chevalier, Fabrice Detrez. Rate Growth Simulation of Spherulitic Microstructure of PET Induced by the Temperature Using the Phase Field Method. 19th ESAFORM Conference, 2016, Nantes, France. ⟨10.1063/1.4963406⟩. ⟨hal-01644938⟩
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