An integration of microstructure predictions and structural analysis in long-fiber-reinforced composite with experimental validation / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 4 (08/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 4 (08/2017) . - p. 455-466 Titre : An integration of microstructure predictions and structural analysis in long-fiber-reinforced composite with experimental validation Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur ; R.-Y. Chang, Auteur ; C.-H. Hsu, Auteur Année de publication : 2017 Article en page(s) : p. 455-466 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par injection Composites à fibres de verre Composites à fibres longues Imagerie tridimensionnelle Microstructures -- Analyse Modèles mathématiques Polypropylène Prévision, Théorie de la Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : Long fiber-reinforced thermoplastic (LFRT) composites are a very important lightweight material for practical use by the automotive industry because their mechanical performance is superior to that of short fibers. Microstructures of LFRT products, including fiber orientation state and fiber length distribution, strongly affect their mechanical properties and testing. Prior numerical approaches were limited by their inability to analyze many complex flows. Currently, the 3D numerical technology is able to analyze a varying geometry flow. We therefore aim to derive accurate predictions of fiber microstructure in a reliable 3D flow simulation of an injection molded LFRT composite part, with the use of objective fiber orientation and fiber length models. In addition, the microstructure data imported to calculate appropriate mechanical properties effectively improves the prediction accuracy of structural performance for an LFRT part. In such an integrative simulation, the predictive results are compared to related experimental data for the purpose of evaluation. Note de contenu : - THEORETICAL BACKGROUND : Basic governing equations - Fiber orientation equations - Fiber attrition equation - RESULTS AND DISCUSSION : Microstructure prediction - Micromechanical properties - Structural analysis DOI : 10.3139/217.3377 En ligne : https://drive.google.com/file/d/1YJvbY5H1ckJWNfFMVajUkdhZu6psHL5a/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28902 [article]

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Non-isothermal simulation of a corner vortex within entry flow for a viscoelastic fluid Huan-Chang Tseng EMAIL logo / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 3 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 3 (2023) . - p. 362-374 Titre : Non-isothermal simulation of a corner vortex within entry flow for a viscoelastic fluid Huan-Chang Tseng EMAIL logo Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur Année de publication : 2023 Article en page(s) : p. 362-374 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Polyéthylène basse densité Rhéologie Simulation par ordinateur Tags : 'Simulation  numérique  3D'  'Vortex  de  coin'  'Flux  d'entrée'  'Modèle  White-Metzner  modifié'  non  isotherme'  'Fluides  viscoélastiques Index. décimale : 668.4 Plastiques, vinyles Résumé : A modified White-Metzner viscoelastic constitutive equation is incorporated into the state-of-the-art Three Dimensional Computational Fluid Dynamics (3D-CFD) framework for performing isothermal and non-isothermal entry flow simulations of a polymer melt. As a result, the corner vortex becomes smaller with increased isothermal temperature, namely, the so-called temperature-induced vortex reduction. In addition, the vortex grows with raising wall temperatures, whereas the vortex reduction is found under high inlet temperatures. Through the visualized flow patterns, it is significant to investigate the dramatic variations of vortex size in relation to fluid temperature, weighted viscosity and extension rate, as well as Weissenberg number and Trouton ratio. Note de contenu : - THEORETICAL BACKGROUND : GNF shear viscosity - GNF-X weighted shear/extensional viscosity - WMT-X viscoelastic constitutive equation - RESULTS AND DISCUSSION : Fit of WMT-X model to viscoelastic material functions - Temperature induced vortex reduction within isothermal entry flow - Simulations of non-isothermal entry flow with vortex streamline - Table 1 : Shear viscosity parameters of Cross-WLF model for LDPE melt - Table 2 : Extensional viscosity parameters of Trouton ratio of GNF-X model for LDPE melt - Table 3 : N 1 parameters of Weissenberg number of WMT-X model for LDPE melt - Table 4 : -N 2/N 1 ratio parameters of WMT-X model for LDPE melt DOI : https://doi.org/10.1515/ipp-2022-4312 En ligne : https://drive.google.com/file/d/1ftb1rtH9JYA2Lsi7n9bhLsQcRctU6-zO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39698 [article]

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Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 4 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 4 (2023) . - p. 447-455 Titre : Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur Année de publication : 2023 Article en page(s) : p. 447-455 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Polyéthylène basse densité Rhéologie Rhéométrie Simulation par ordinateur Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : In capillary rheometry of a polymer melt, the total pressure drop consists of three primary components: shear viscosity, extensional viscosity, and normal stress differences. Traditionally, viscoelastic constitutive equations have been used to produce accurate predictions regarding the pressure drop. It is difficult to investigate the primary components in past experimental measurements and numerical computations. The useful improvement of the classic White-Metzner viscoelastic constitutive equation coupled with the weighted shear/extension viscosity is performed in isothermal capillary flow simulations. It is significant to analyze the extension-induced pressure drop for a short die and the shear-induced pressure drop for a long die, along with a small contribution of normal stress differences. Note de contenu : - GNF shear viscosity - GNF-X weighted shear/extensional viscosity - WMT-X viscoelastic constitutive equation - Table 1 : Model parameters of material functions for a LDPE melt at 150 °C - Table 2 : For a LDPE melt in capillary rheometry with a short die with aspect ratio of L/D = 0.2, the total pressure drop consists of three components, ΔP S , ΔP E , and ΔP N . - Table 3 : For a LDPE melt in capillary rheometry with a long die with aspect ratio of L/D = 20, the total pressure drop consists of three components, ΔP S , ΔP E , and ΔP N DOI : https://doi.org/10.1515/ipp-2022-4322 En ligne : https://drive.google.com/file/d/1VHLhRybQ3B6B_lOcerg2aJ3IXuMZTnw2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40107 [article]

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Numerical investigations of fiber orientation models for injection molded long fiber composites / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 4 (08/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 4 (08/2018) . - p. 543-552 Titre : Numerical investigations of fiber orientation models for injection molded long fiber composites Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur ; R.-Y. Chang, Auteur ; C.-H. Hsu, Auteur Année de publication : 2018 Article en page(s) : p. 543-552 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par injection Composites à fibres longues Distribution et orientation des fibres Modèles numériques Prévision, Théorie de la Index. décimale : 668.4 Plastiques, vinyles Résumé : Understanding the effect of fiber orientation on mechanical properties is a primary consideration for long fiber-reinforced thermoplastics in automotive applications. In injection-molded parts, the classical Folgar-Tucker model has been used to predict the shell-core structure of short fiber orientation patterns. However, this model results in a thinner core region for long fiber composites. Recently, the RSC (Reduced Strain Closure), ARD (Anisotropic Rotary Diffusion), and iARD-RPR (improved ARD and Retarding Principal Rate) models are potential models developed in relation to suspension rheology. In addition to improving the inaccurate predictions, a so-called inlet condition of fiber orientation set at the gate is examined in the RSC. In this approach, a significant requirement is to numerically investigate the nature of the shell-core structure, while validating a predictive difference between the orientation models via related experimental data. Dramatic changes in the orientation distribution at various filling times and mold temperatures are discussed herein. Note de contenu : - THEORETICAL BACKGROUND : Folgar-Tucker isotropic rotary diffusion model - RSC model and ARD-RSC model - iART-RPR model - RESULTS AND DISCUSSION : Folgar-Tucker model for the shell-core structure in a center-gated disc - RSC model associated with the inlet condition to determine the broader core - Validation of Folgar-Tucker, ARD-RSC and iARD-RPR models with experimental data of long fiber orientation - Predictive results for significant influence of filling time and mold temperature on core width DOI : 10.3139/217.3550 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3550/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30894 [article]

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Numerical predictions of fiber orientation for injection molded rectangle plate and tensile bar with experimental validations / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 1 (03/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 1 (03/2018) . - p. 96-105 Titre : Numerical predictions of fiber orientation for injection molded rectangle plate and tensile bar with experimental validations Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur ; R.-Y. Chang, Auteur ; C.-H. Hsu Année de publication : 2018 Article en page(s) : p. 96-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Matériaux Composites à fibres Composites à fibres -- Moulage par injection Distribution et orientation des fibres Prévision technologique Index. décimale : 668.4 Plastiques, vinyles Résumé : Fiber composites are the pinnacle of lightweight materials in the automotive industry. The orientation of the reinforcing fibers strongly affects the mechanical performance of the finished part. However, fiber orientation prediction with high accuracy is difficult for a complex flow field in practical injection molding. Recently, an objective model, iARD-RPR (Improved Anisotropic Rotary Diffusion and Retarding Principal Rate), has been significant to provide anisotropic distribution of fiber orientation, such as the well-known skin-shell-core structure. Micro-computed tomography (micro-CT) scan is a state-of-the-art technique for measuring a very high 3D resolution of a specimen's fiber orientation data. According to the micro-CT experiments and injection molding simulations with the iARD-RPR computation, we investigate changes in fiber orientation distributions at different concentrations in a rectangle plate, while the alignment of fibers found in weld line is revealed for tensile bar. Comparisons of the fiber orientation predictions with the validated experimental data are also presented herein. Note de contenu : - Theoretical Background - Results and discussion : Investigated system description - iART-RPR orientation prediction DOI : 10.3139/217.3404 En ligne : https://drive.google.com/file/d/1jfTqH9FMDaV0_M_ojVul1DhwEJaWj1t1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30190 [article]

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Numerical visualization of extensional flows in injection molding of polymer melts / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 2 (2023)  

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Prediction of fibre microstructure in injection moulding using innovative simulation technology / Huan-Chang Tseng in JEC COMPOSITES MAGAZINE, N° 91 (08-09/2014)

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Simulation technology for fibre concentration prediction in lightweight FRP product designs / Huan-Chang Tseng in JEC COMPOSITES MAGAZINE, N° 105 (06/2016)  

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The 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)  

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The effect of fiber content and aspect ratio on anisotropic flow front and fiber orientation for injection-molded fiber composites / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 39, N° 1 (2024)  

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Three-dimensional simulation of capillary rheometry for an estimation of extensional viscosity / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 2 (2023)  

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Three-dimensional simulation of vortex growth within entry flow of a polymer melt / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)  

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