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Predicting in- and out-of-plane damage evolution in woven fibre-reinforced composites / Wouter Wilson in JEC COMPOSITES MAGAZINE, N° 100 (10/2015)
[article]
Titre : Predicting in- and out-of-plane damage evolution in woven fibre-reinforced composites Type de document : texte imprimé Auteurs : Wouter Wilson, Auteur Année de publication : 2015 Article en page(s) : p. 64-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres
Détection de dommages (matériaux)
Eléments finis, Méthode des
Essais dynamiques
Prévision, Théorie de la
TissésIndex. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : In order to successfully design and qualify composite landing gear parts, it is essential to be able to reliably predict the mechanical and failure behaviour of composites. Therefore, Fokker Landing Gear developed their own material model to predict the failure behaviour of fibre-reinforced composites. A comparison with test data showed that the failure behaviour in many different tests could be predicted very well with this material model. Note de contenu : - Material model
- Mesh dependency
- Delaminations
- Implementation in abaqus and general model description
- Determination of unknown material parameters
- ValidationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25930
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Code-barres Cote Support Localisation Section Disponibilité 17538 - Périodique Bibliothèque principale Documentaires Disponible Predicting the non-linear conveying behavior in single-screw extrusion : a comparison of various data-based modeling approaches used with cfd simulations / W. Roland in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 5 (2021)
[article]
Titre : Predicting the non-linear conveying behavior in single-screw extrusion : a comparison of various data-based modeling approaches used with cfd simulations Type de document : texte imprimé Auteurs : W. Roland, Auteur ; C. Marschik, Auteur ; M. Kommenda, Auteur ; A. Haghofer, Auteur ; S. Dorl, Auteur ; S. Winkler, Auteur Année de publication : 2021 Article en page(s) : p. 529-544 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis
Matières plastiques -- Extrusion:Polymères -- Extrusion
Prévision, Théorie de la
Rhéologie
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : The traditional approach to modeling the polymer melt flow in single-screw extruders is based on analytical and numerical analyses. Due to increasing computational power, data-driven modeling has grown significantly in popularity in recent years. In this study, we compared and evaluated databased modeling approaches (i. e., gradient-boosted trees, artificial neural networks, and symbolic regression models based on genetic programming) in terms of their ability to predict – within a hybrid modeling framework – the three-dimensional non-linear throughput-pressure relationship of metering channels in single-screw extruders. By applying the theory of similarity to the governing flow equations, we identified the characteristic dimensionless influencing parameters, which we then varied to create a large dataset covering a wide range of possible applications. For each single design point we conducted numerical simulations and obtained the dimensionless flow rate. The large dataset was divided into three independent sets for training, interpolation, and extrapolation, the first being used to generate and the remaining two to evaluate the models. Further, we added two features derived from expert knowledge to the models and analyzed their influence on predictive power. In addition to prediction accuracy and interpolation and extrapolation capabilities, we evaluated model complexity, interpretability, and time required to learn the models. This study provides a rigorous analysis of various data-based modeling approaches applied to simulation data in extrusion. Note de contenu : - MELT-CONVEYING SIMULATIONS : Governing equations - Dimensionless representation - Traditional melt-conveying model - Parametric design study - Numerical simulations
DATA-BASED MODELING : Data preparation – Modeling - Modeling results
- Table 1 : Range of values for n, t/Db, and h/w of the new (merged) dataset
- Table 2 : Range of Pp,z depending on the power-law exponent of the merged dataset. The numbers of equidistant steps are 61 and 31, respectively, for the "original" and the “additional" data spaces
- Table 3 : Number of samples per dataset after data splitting
- Table 4 : Value ranges of each feature for the three different datasets
- Table 5 : Model performance for the regression task of predicting ΠV from the influencing parameters
- Table 6 : Model performance for the regression task of predicting ΠV. Comparing the influence of the additional features F1 and F2 on the prediction error
- Table 7 : Performance of the traditional Newtonian melt-conveying models for predicting ΠV
- Table 8 : Model constants for the best performing symbolic regression model
DOI : https://doi.org/10.1515/ipp-2020-4094 En ligne : https://drive.google.com/file/d/12pNqnSQWNmTVTc1gCK_cszVmf9dWA1eR/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36520
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 5 (2021) . - p. 529-544[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23735 - Périodique Bibliothèque principale Documentaires Disponible Predicting the replication fidelity of injection molded solid polymer microneedles / Tim Evens in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 3 (2022)
[article]
Titre : Predicting the replication fidelity of injection molded solid polymer microneedles Type de document : texte imprimé Auteurs : Tim Evens, Auteur ; Sylvie Castagne, Auteur ; David Seveno, Auteur ; Albert Van Bael, Auteur Année de publication : 2022 Article en page(s) : p. 237-254 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Micro-aiguilles
Polycarbonates
Polypropylène
Prévision, Théorie de la
Réplication (technologie)
Simulation par ordinateurIndex. décimale : 668.9 Polymères Résumé : Microneedles are sharp microscopic features, which can be used for drug or vaccine delivery in a minimally invasive way. Recently, we developed a method to produce polymer microneedles using laser ablated molds in an injection molding process. At this moment, extensive injection molding experiments are needed to investigate the replication fidelity. Accurate predictions of the injection molding process would eliminate these costly and time expensive experiments. In this study, we evaluated the replication fidelity of solid polymer microneedles using numerical simulations and compared the results to injection molding experiments. This study was performed for different sizes of microneedles, different thermoplastics (polypropylene and polycarbonate) and different mold materials (tool steel, copper alloy and aluminium alloy). Moreover, different processing conditions and different locations of the microneedles on the macroscopic part were considered. A good correlation with experimental findings was achieved by optimizing the heat transfer coefficient between the polymer and the mold, while using a multiscale mesh with a sufficient number of mesh elements. Optimal heat transfer coefficients between 10,000 and 55,000 W/m2 K were found for the different combinations of polymer and mold materials, which resulted in an accuracy of the simulated microneedle replication fidelity between 94.5 and 97.0%. Note de contenu : - MATERIALS AND METHODS : Thermoplastic polymers - Mold insert -
Injection molding product - Injection molding experiments
- INJECTION MOLDING SIMULATIONS SETTINGS : It can be assumed that the macroscopic flow - Simulation parameters in Moldex3D - Mesh convergence study using multi-scale meshing - Heat transfer coefficient - Replication fidelity in function of the location of the microfeatures - Replication fidelity in function of the injection molding parameter - Replication fidelity in function of the mold material
- RESULTS AND DISCUSSION : Macroscopic flow - Mesh convergence study - Effect of the heat transfer coefficient - Replication fidelity in function of the location of the microfeatures - Replication fidelity in function of the injection molding parameters - Replication fidelity in function of the mold material
- Table 1 : Main properties of the thermoplastics based on material datasheets and the Moldex3D 2020 material database
- Table 2 : Thermal properties of the different mold materials based on material datasheets
- Table 3 : Injection molding process parameters for the two thermoplastic materials
- Table 4 : Default and adapted simulation parameters in Moldex3D
- Table 5 : Adapted injection molding process parameters for the two thermoplastic materials
- Table 6 : Heat transfer coefficients, corresponding to a minimal average absolute deviation between the simulated and experimentally determined replication fidelity, for the PP and PC in combination with the tool steel, the aluminium alloy and the copper alloy mold insert
DOI : https://doi.org/10.1515/ipp-2021-4207 En ligne : https://drive.google.com/file/d/1oNumrisvhCE-7j_vpdYOWG6Ed6AmPXcr/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37904
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Code-barres Cote Support Localisation Section Disponibilité 23738 - Périodique Bibliothèque principale Documentaires Disponible Prediction and validation of short fiber orientation in a complex injection molded part with Chunky geometry / Stefan Kleindel in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)
[article]
Titre : Prediction and validation of short fiber orientation in a complex injection molded part with Chunky geometry Type de document : texte imprimé Auteurs : Stefan Kleindel, Auteur ; D. Salaberger, Auteur ; R. Eder, Auteur ; H. Schretter, Auteur ; C. Hochenauer, Auteur Année de publication : 2015 Article en page(s) : p. 366-380 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par injection
Composites à fibres courtes
Distribution et orientation des fibres
Prévision, Théorie de la
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The paper shows the capability of state-of-the-art models and software to predict the fiber orientation distribution (FOD) on injection molded parts with a complex and thick-walled geometry. Predictions by the standard Folgar-Tucker model and the Reduced Strain Closure model were compared to measurements of the fiber orientation distribution obtained by X-ray Computed Tomography. Measurements and simulations were performed under different processing conditions to investigate the influence of injection velocity and packing pressure on the FOD. It was found that the predicted fiber orientation is in good qualitative agreement with the measurements. The measured orientation shows a distinct shell-core structure with high alignment of the fibers in flow direction in the shell layer and a orientation perpendicular to the flow direction in the core layer. While the orientation in the shell layer is predicted fairly well, a significant deviation is found in the prediction of the orientation in the core layer. Note de contenu : - MEASUREMENTS
- EXPERIMENTAL
- NUMERICAL : Computational mesh - Material data - Fiber orientation - Solver settings
- RESULTS : Influence of the processing conditions on the fiber orientation - Results of the fiber orientation prediction
- DISCUSSION : The mesh - Solver settings - Boundary condition for the fiber orientation - Rheological model - Suggestions for further investigationsDOI : 10.3139/217.3047 En ligne : https://drive.google.com/file/d/1N1uretG0XwJdlIfK-nUmpBC-VUCobfhP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24332
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible Prédiction de l'évolution de la morphologie de mélanges de polymères immiscibles en cisaillement simple et écoulement élongationnel / P. J. Carreau in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)
[article]
Titre : Prédiction de l'évolution de la morphologie de mélanges de polymères immiscibles en cisaillement simple et écoulement élongationnel Type de document : texte imprimé Auteurs : P. J. Carreau, Auteur ; C. Lacroix, Auteur ; M. Grmela, Auteur Année de publication : 1998 Article en page(s) : p. 223-227 Note générale : Bibliogr. Langues : Français (fre) Catégories : Cisaillement (mécanique)
Copolymère éthylène acétate de vinyle
Copolymère éthylène acrylate de méthyle
Ecoulement élongationnel
Matières plastiques -- Extrusion:Polymères -- Extrusion
Morphologie (matériaux)
Polyéthylène
Polystyrène
Prévision, Théorie de la
RhéologieIndex. décimale : 668.9 Polymères Résumé : L'évolution de la morphologie de mélanges de polymères immiscibles a été étudiée en cisaillement simple et pour des écoulements élongationnels. Les prédictions du modèle de Lee and Park, extension de la théorie de Doi et Ohta, et de ce modèle modifié ainsi que celle du modèle modifié de Grmela et Ait-Kadi sont comparées aux données d'accroissement de contraintes en cisaillement. Le diamètre des gouttes de la phase dispersée après relaxation dépend fortement de la grandeur de la vitesse de déformation imposée. Les modèles prédisent bien le diamètre pour un mélange de polypropylène (PP), éthylène vinyl acétate (EVA) et éthylène méthyl acrylate (EMA). Les prédictions sont beaucoup moins bonnes pour un mélange de polystyrène (PS)/polyéthylène (PE). L'évolution de la morphologie d'un mélange PP/EVA/EMA a été aussi étudiée pour un écoulement élongationnel dans une filière d'extrusion convergente. Des structures fibrillaires de la phase dispersée du mélange extrudé ont été observées. Ce comportement est prévu par les équations d'évolution du modèle de Lee et Park. Toutefois, le modèle prédit un diamètre de fibrilles de beaucoup inférieur à celui observé à partir de clichés de microscopie électronique de l'échantillon extrudé. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36497
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Code-barres Cote Support Localisation Section Disponibilité 21932 - Colloque, congrès, etc. Bibliothèque principale Documentaires Disponible Prediction of surface temperatures / Bernd Neumann in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4621 (06/2016)
PermalinkPrediction of the photofading of 1-H or 1-ethyl derivatives of 3-cyano-6-hydroxy-4-methyl-5-(p-X-phenylazo)-2-pyridone dyes and their azo-hydrazone tautomerism: A theoretical study / Krzysztof Wojciechowski in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)
PermalinkProspective strategies for composite production / Andreas Schnabel in JEC COMPOSITES MAGAZINE, N° 73 (06/2012)
PermalinkQuid du comportement des élastomères / Patrick Heuillet in CAOUTCHOUCS & PLASTIQUES, N° 797 (09/2001)
PermalinkResource efficiency with plastics technology / Christian Bonten in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 6 (06/2014)
PermalinkService life prediction of colour retention for PVDF architectural coatings with organic pigments / Kurt A. Wood in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B3 (09/2006)
PermalinkSimulation technology for fibre concentration prediction in lightweight FRP product designs / Huan-Chang Tseng in JEC COMPOSITES MAGAZINE, N° 105 (06/2016)
PermalinkPermalinkSimulations of nanoscale and macroscopic property changes on coatings with weathering / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 3 (07/2006)
PermalinkSpecialised TiO2 grade for flat paints / Stéphane Cappelle in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4606 (03/2015)
PermalinkSustainability in the paints and coatings industry : far more than just a "good idea" / George R. Pilcher in COATINGS TECH, Vol. 18, N° 5 (05/2021)
PermalinkThe effect of extensional viscosity on the core structure of fiber orientation for injection-molded fiber composites / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 4 (2023)
PermalinkThe prediction of leather mechanical properties from airborne ultrasonic testing of hides / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 3 (03/2017)
PermalinkUse of a predictive colour model for managing the colour appearance of two-colour woven fabrics / Krste Dimitrovski in COLORATION TECHNOLOGY, Vol. 136, N° 3 (06/2020)
PermalinkVers une analyse prospective de la durabilité du cycle de vie : exploration des complémentarités entre l'analyse du cycle de vie de vie sociale et environnementale pour le système énergétique / Benedetto Rugani in MATERIAUX & TECHNIQUES, Vol. 102, N° 6/7 (2014)
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