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Article Dans Une Revue Mechanics of Time-Dependent Materials Année : 2022

Modeling strain-induced dual-phase transformation in semicrystalline polylactide

Hanen Mahjoubi
  • Fonction : Auteur
Iurii Vozniak
  • Fonction : Auteur
Zoubeir Tourki
  • Fonction : Auteur
Fahed Zaïri
  • Fonction : Auteur

Résumé

Polylactic acid or polylactide (PLA) can form amorphous, semicrystalline, or highly crystalline structure. In this paper, we provide a model for semicrystalline PLA under straininduced dual-phase transformation, between mesomorphization and crystallization. In the proposed constitutive model, we use an internal state variable approach by considering initial microstructure, strain-induced dual-phase transformation, intermolecular features, and preferred network orientation-induced anisotropy. The effective contribution of the newly created phases is considered in both the elastic-viscoplastic intermolecular resistance and the viscohyperelastic network resistance using a micro-macro transition approach. We find a good agreement between the model and experimental data for the semicrystalline PLA in terms of progressive evolution of the mesomorphic/crystalline phases along with stressstrain behavior up to very large strains and over a wide range of crystallinities. The relationship between initial crystallinity, strain-induced molecular ordering, newly created phases, and mechanical response is discussed.
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Dates et versions

hal-03766810 , version 1 (01-09-2022)

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Hanen Mahjoubi, Fahmi Zaïri, Iurii Vozniak, Zoubeir Tourki, Fahed Zaïri. Modeling strain-induced dual-phase transformation in semicrystalline polylactide. Mechanics of Time-Dependent Materials, 2022, ⟨10.1007/s11043-022-09563-y⟩. ⟨hal-03766810⟩
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