Accueil
Résultat de la recherche
2 résultat(s) recherche sur le tag ''prédiction'
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
Analytical prediction of roll coating with counter-rotating deformable rolls / Bettina Willinger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
[article]
Titre : Analytical prediction of roll coating with counter-rotating deformable rolls Type de document : texte imprimé Auteurs : Bettina Willinger, Auteur ; Antonio Delgado, Auteur Année de publication : 2014 Article en page(s) : p. 31-37 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Revêtement au rouleau' 'Rouleau déformable' 'Ecart négatif' 'Prédiction analytique' Index. décimale : 667.9 Revêtements et enduits Résumé : Roll coating is a common technique for applying thin coating films on continuous substrates, e.g., papers and foils. Key advantages are the comparatively simple technology and the possibility of coating thin films using highly viscous fluids. Since roll coating is a self-metered process, the prediction of film thicknesses is of fundamental interest for industrial process control. In the present work, a new analytical approach for the prediction of the film thickness in roll coating with deformable rolls and negative gaps is developed. This method is based on the fluid dynamic theory of lubrication approximation. The film thickness is calculated depending on the geometry of the rolls (including the elasticity of the rubber), the fluid properties of the applied film and the roll velocities. This is gained by using boundary conditions for pressure and—in contrast to former literature—for force. The quality of the predicted results is validated with experimental data from literature. The comparison shows good agreement and thus the derived analytical model offers new possibilities for predicting film thickness and understanding of the associated influence parameters. Note de contenu : - GOVERNING EQUATIONS AND CALCULATION MODEL : Basic equations - Set-up of the calculation model - Calculation procedure and result
- RESULTS AND DISCUSSION : Validation for thick rubber covers - Validation for thin rubber coversDOI : 10.1007/s11998-013-9506-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9506-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20613
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 31-37[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16023 - Périodique Bibliothèque principale Documentaires Disponible Numerical modeling of the effects of fiber packaging and reinforcement volume ratio on the transverse elasticity modulus of a unidirectional composite material glass/epoxy / Brek Samir in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 5-6 (12/2020)
[article]
Titre : Numerical modeling of the effects of fiber packaging and reinforcement volume ratio on the transverse elasticity modulus of a unidirectional composite material glass/epoxy Type de document : texte imprimé Auteurs : Brek Samir, Auteur ; Meddour Belkacem, Auteur ; Groun Brahim, Auteur Année de publication : 2020 Article en page(s) : p. 203-210 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres de verre
Epoxydes
Fibres à orientation unidirectionnelle
Micromécanique (physique du solide)
Modèles numériquesTags : 'Composites à fibres de verre' 'Analyse micromécanique' 'Prédiction des propriétés' 'Facteur renforcement' 'Module transverse' 'Lame unidirectionnelle' Epoxy Index. décimale : 668.4 Plastiques, vinyles Résumé : Composite materials are very widely used in the manufacturing of structures because of their specific mechanical properties. However, they are characterized by heterogeneity and anisotropy and they present great challenges in designing and also in predicting their behavior by using the numerical simulation. The unidirectional composite material has a more relevant property which is the transverse elasticity modulus E2. The determination of E2 is still interesting researchers because of the diversity of results obtained by several models and approaches. This study aims to predict the transverse elasticity modulus E2 of a unidirectional Glass/Epoxy composite material, the effect of the arrangement fibers on the transverse elasticity modulus and predict the values of the reinforcement factor used in the Halpin-Tsai model. To do so first we adopted the micromechanical approach, which is accurate but requires much computing, and we used a calculation code based on FEM method and considered two parameters to vary, which are the volume fraction of fibers and the distribution of fibers. The obtained results of numerical modeling were tightly compared to those obtained by the available analytical models and the adopted approach can be used to predict the transverse elasticity modulus E2 and the reinforcement factor ξ. Note de contenu : - ANALYTICAL MODELS BASED ON THE RULE OF MIXTURE : Rule of mixture (ROM) - Halpin-Tsai (HT) and modified Halpin-Tsai (HTM) models - Chamis (CH) model - Tsai with contiguity model
- FINITE ELEMENT MODELING : Objective - Materials and characterizations - Representative volume element (RVE) - Cell geometry used for meshesMesh of the representative volume Calculation of the transverse elasticity module E2 - Calculation of the reinforcement factor ξ
- RESULTS AND DISCUSSION : The effect of the position of the fibers on the transverse modulus of elasticity E2 - Normal stress distribution σ22 - Transverse elasticity module as a function of the volume content of the fibers - Reinforcement factor as a function of the volume content of the fibers
- Table 1 : The elastic characteristics
- Table 2 : Boundary conditions along the 2 and 3 directionsDOI : https://doi.org/10.18280/rcma.305-602 En ligne : https://www.iieta.org/download/file/fid/46441 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37652
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 5-6 (12/2020) . - p. 203-210[article]