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Experimental and numerical investigation of shrinkage and warpage of a U-shaped injection molded part / Stefan Kleindel in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)
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[article]
Titre : Experimental and numerical investigation of shrinkage and warpage of a U-shaped injection molded part Type de document : texte imprimé Auteurs : Stefan Kleindel, Auteur ; R. Eder, Auteur ; H. Schretter, Auteur ; C. Hochenauer, Auteur Année de publication : 2016 Article en page(s) : p. 68-81 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre
Composites à fibres de verre -- Moulage par injection
Gauchissement (matériaux)
Mesure
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Polyoxyméthylène
Retrait au moulage
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : Prediction of shrinkage and warpage of injection molded plastic parts is a key issue of injection molding simulation. In the present work a U-shaped part is investigated experimentally and by means of state of the art injection molding simulation software. The part has thick walls in the corner where inner defects such as voids and porous zones may appear. Experiments and simulations were performed with POM and glass fiber reinforced polyamide. Measurements of pressure in the cavities and temperature profiles around the cavities were used to validate the numerical model. In case of POM it was found that warpage predictions are way off when the void volume is high and in good agreement when the void volume is minimized. No such correlation was observed in case of fiber reinforced materials. Here, shrinkage and warpage are dominated by the fiber orientation state with minor influence of the processing conditions. Predicted warpage was found to be extremely dependent on the used closure approximation. Note de contenu : - PROBLEM DESCRIPTION
- EXPERIMENTAL : Mold design - Measurements
- NUMERICAL : Computational mesh - Material data - Boundary conditions
- RESULTS : Experimental results - Simulation results - DiscussionDOI : 10.3139/217.3148 En ligne : https://drive.google.com/file/d/1Lw0SrrPweDXNzbZ_k8OjnAguT44jH1tU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25770
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 1 (03/2016) . - p. 68-81[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17899 - Périodique Bibliothèque principale Documentaires Disponible Measurement and numerical simulation of void and warpage in glass fiber reinforced molded chunky parts / Stefan Kleindel in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 1 (03/2015)
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Titre : Measurement and numerical simulation of void and warpage in glass fiber reinforced molded chunky parts 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. 100-112 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de verre -- Moulage par injection
Déformations (mécanique)
Gauchissement (matériaux)
Moulage par injection -- Défauts
Polyamide 6
Simulation par ordinateurIndex. décimale : 668.9 Polymères Résumé : The aim of this paper is to determine the reason for the large warpage of an injection molded chunky part made of glass fiber reinforced polyamide 6. State of the art commercial 3D injection molding simulation software was used to predict the warpage of the part. While the simulation predicted a product virtually free of warpage the molded parts showed a large deformation. Several molding experiments and X-ray computed tomography (?CT) scans of the moldings have been performed to figure out the reason for this. The ?CT scans revealed voids in the thick walls of the part. It was found that these defects were the main cause of the unreliable simulation results. Therefore it is concluded that voids can have a major influence on the reliability of numerical warpage predictions. This paper shows a simplified method to determine the zones were voids will appear and shows the comparison with ?CT-data. Note de contenu : - PROBLEM DESCRIPTION
- MEASUREMENTS
- EXPERIMENTS : Initial case - Variant
- NUMERICAL ANALYSIS : Computational mesh - Material data - Fiber orientation - Warpage prediction - Process settings - Solver settings
- RESULTS AND DISCUSSION : Experimental results - µCT results - Simulation results - Prediction of porous zonesDOI : 10.3139/217.2984 En ligne : https://drive.google.com/file/d/1d_Zb9TKitwRi7zAjPmz5RFAXco_AJv4m/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23427
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 1 (03/2015) . - p. 100-112[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17016 - 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)
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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
in INTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 366-380[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17309 - Périodique Bibliothèque principale Documentaires Disponible