Simulation-based approach for probing rheology-processing-structure relationships in foam blow molding / A. Kumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 5 (11/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 5 (11/2019) . - p. 513–531 Titre : Simulation-based approach for probing rheology-processing-structure relationships in foam blow molding Type de document : texte imprimé Auteurs : A. Kumar, Auteur ; B. Patham, Auteur ; S. Mohanty, Auteur ; Sanjay K. Nayak, Auteur Année de publication : 2019 Article en page(s) : p. 513–531 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bouteilles en matières plastiques Déformations (mécanique) Matières plastiques -- Moulage par soufflage Morphologie (matériaux) Mousses plastiques Polyéthylène basse densité Rhéologie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : The broad objective of this work was to demonstrate a modelling and simulation framework for foam blow molding using commercially available simulation software. The simulation framework would have to account for the initial morphology of the foam, the relationship between the morphology and the rheological and deformation characteristics of the foam at high temperatures and high strains that are typically encountered during blow molding, and correlate the strains developed during blow molding to the morphological aspects in the resulting blow molded part. These aspects are addressed in this paper using simulations of uniaxial tensile deformation of a virtual representative volume element of a foam microstructure (rendered in DIGIMAT-FE) to derive the nonlinear tensile response of the foam at high temperatures (using ABAQUS). The resulting simulated stress-strain curve is employed to parameterize a nonlinear rheological constitutive equation. These parameters are then employed for the homogenized representation of the foam in the blow molding simulation carried out in B-SIM, a commercially available simulation software for blow molding. The regions where the simulated parison has undergone primarily uniaxial elongation are then mapped back to the expected local foam morphology using the transfer functions derived from the RVE simulations. These steps result in a preliminary and simple demonstration of the simulation framework, and offer a template that can be detailed further with experimental rheological information on actual foamed parisons, and more detailed post-processing algorithms to correlate multiaxial elongations with microstructure. Note de contenu : - INTRODUCTION : Motivation - Foam blow molding process phenomenology - Scope - Objectives - - APPROACH - IMPLEMENTATION OF THE SIMULATION FRAMEWORK, PART I : DERIVATION OF RHEOLOGICAL PARAMETERS FOR HOMOGENIZED REPRESENTATION OF FOAM : Derivation of foam nonlinear stress-strain characteristics using RVE simulation - Derivation of foam morphology evolution characteristics using RVE simulation - Foam K-BKZ constitutive parameters - IMPLEMENTATION OF THE SIMULATION FRAMWORK. PART II : BLOW MOLDING SIMULATION : B-SIM simulation setup - Analysis of B-SIM simulation output DOI : https://doi.org/10.3139/217.3801 En ligne : https://www.hanser-elibrary.com/doi/pdf/10.3139/217.3801 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33614 [article]

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