Evaluation of thermo-mechanical and wear behavior of short carbon fibre vinyl-ester filled homogenous and their functionally graded composites / B. Gangil in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 207-220 Titre : Evaluation of thermo-mechanical and wear behavior of short carbon fibre vinyl-ester filled homogenous and their functionally graded composites Type de document : texte imprimé Auteurs : B. Gangil ; Amar Patnaik ; A. Kumar Année de publication : 2013 Article en page(s) : p. 207-220 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Composites à fibres -- Détérioration Composites à fibres -- Propriétés thermomécaniques Composites à fibres courtes Composites à fibres de carbone Esters de polyvinyle Usure (mécanique) Index. décimale : 668.9 Polymères Résumé : The paper presents the processing and mechanical characterization of chopped carbon fibre reinforced homogenous and functionally graded vinyl ester composites and also reports on their sliding wear characteristics respectively. The sliding wear characteristics are studied with the help of POD test employing the design of experiments approach based on Taguchi’s orthogonal arrays. Dynamic mechanical analysis is carried out of the investigated homogenous/FGMs composites to investigate the overall stiffness/flexibility, so as to improve the specific wear rate. Present study reveals that graded composite possess good mechanical and wear characteristics compared to homogenous composites. SEM confirms the graded dispersion of carbon fibre in the matrix. Note de contenu : - EXPERIMENTAL DETAIL : Preparation of the specimens - Dry sliding wear test apparatus - Dynamic mechanical analysis - Experiment design - RESULTS AND DISCUSSION : Effect of fibre loading on void fraction of the composites - Effect of fibre loading on hardness of the composites - Effect of fibre loading on tensile strength of the composites - Effect of fibre loading on flexural strength of the composites - Effect of fibre loading on impact energy of the composites - Dynamic mechanical analysis of homogeneous and graded composites - Taguchi experimental design analysis for homogeneous and graded composites - Worn surface morphology of homogeneous and graded composites - ANOVA and effects of factors on specific wear rate of the composites - Confirmation experiment for homogeneous and graded composites DOI : 10.3139/217.2682 En ligne : https://drive.google.com/file/d/1WgB039PEzRKziTi7Hhym9IwTKuVMgrT4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18434 [article]

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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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