An engineering model that simulates pantographing occurring in the shaping process of reinforced uncured rubber parts / B. Debbaut in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 84-89 Titre : An engineering model that simulates pantographing occurring in the shaping process of reinforced uncured rubber parts Type de document : texte imprimé Auteurs : B. Debbaut, Auteur Année de publication : 2017 Article en page(s) : p. 84-89 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc Composites à fibres Composites thermoplastiques Matériaux -- Déformations géométriques et dimensionnelles Pantographie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : When a material volume consisting of an uncured rubber matrix reinforced with two non-parallel sets of embedded reinforcement wires or cords is subjected to large deformations, pantographing may occur. In other words, the angles between reinforcement wires change. We introduce a simple phenomenological fluid model suitable for the numerical prediction of pantographing, as can be encountered in industrial processes such as the manufacturing of rubber tires or reinforced hoses. The reinforced material is described with an orthotropic continuous fluid model. Here the reinforcement wires or cords are accounted for by the orthotropy, whose direction is locally affected by the deformation undergone by the matrix, and is updated accordingly. The model is subsequently applied to the simulation of a sagging experiment, where the role of pantographing is illustrated. Note de contenu : - Model constructions - Application : simulation of pantographing DOI : 10.3139/217.3287 En ligne : https://drive.google.com/file/d/1BYlGJvH8jnMbbNL1spJjoK4261YfAkB9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28004 [article]

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Experimental investigation of PC-films using optical measurements / Christian Dammann in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 2 (05/2014) . - p. 260-271 Titre : Experimental investigation of PC-films using optical measurements Type de document : texte imprimé Auteurs : Christian Dammann, Auteur ; I. Caylak, Auteur ; Rolf Mahnken, Auteur Année de publication : 2014 Article en page(s) : p. 260-271 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anisotropie Contraintes (mécanique) Films plastiques Matériaux -- Déformations géométriques et dimensionnelles Mesures dimensionnelles sans contact Mesures optiques Polycarbonates Index. décimale : 668.9 Polymères Résumé : The alignment of polymer chains is a well known microstructural evolution effect due to straining of polymers. This has a drastic influence on the macroscopic properties of the initially isotropic material. In this work, cold forming is performed at room temperature on a tensile testing machine. Polycarbonate films are examined in two loading phases. In the first phase, the specimen is loaded to induce anisotropy, and in the second, it is re-loaded, while the material direction is varied. The investigations are supported by an optical measurement system to gain knowledge about the inhomogeneous material behavior in the initial loading phase and about the anisotropic homogeneous behavior during the re-loading phase. Two dimensional strain contours are obtained from the test data. Additionally, we propose a method for approximation of the macroscopic true stress and compare the results with a common approach based on volume consistency. In the future, the test data will set a basis for parameter identification of constitutive equations taking into account a combination of inhomogenous and homogenous material behavior, exhibiting strain induced anisotropy. Note de contenu : - SPECIMENS AND TESTING EQUIPMENT : Material and specimen preparation for initial loading - Cut-out specimens for re-loading - Experimental equipment - FUNDAMENTALS FOR EXPERIMENTS ON INDUCED ANISOTROPY WITH OPTICAL MEASUREMENTS : Definitions of kinematics and stresses - Cauchy stress using area approximations with optical measurements - Approximation of Cauchy stress using volume consistency - EFFECT OF VARYING STRAIN-RATES AND MOLAR MASSES - INVESTIGATIONS OF INDUCED ANISOTROPY FOR POLYCARBONATE FILMS : INITIAL AND RE-LOADING : Initial loading - Re-loading - ON DETERMINATION OF THE CAUCHY STRESS : Initial loading - Reloading DOI : 10.3139/217.2848 En ligne : https://drive.google.com/file/d/1_N7bOckKeNiIH_YMh2s-x5jS3xELNmCj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21321 [article]

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Hybrid moulds with epoxy-based composites – effects of materials and processing on shrinkage and warpage / P. G. Martinho in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 3 (07/2011) . - p. 256-264 Titre : Hybrid moulds with epoxy-based composites – effects of materials and processing on shrinkage and warpage Type de document : texte imprimé Auteurs : P. G. Martinho, Auteur ; A. Sabino Netto, Auteur ; C. H. Ahrens, Auteur ; G. V. Salmoria, Auteur ; A. S. Pouzada, Auteur Année de publication : 2011 Article en page(s) : p. 256-264 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matériaux -- Déformations géométriques et dimensionnelles Moulage par injection -- Défauts Moules d'injection Polymères amorphes Polymères semi-cristallins Thermocinétique Thermoplastiques -- Moulage par injection Index. décimale : 668.4 Plastiques, vinyles Résumé : This paper contributes with the analysis of the case of a complex three-dimensional shape that was moulded in a standard steel mould and an alternative hybrid mould with steel cavity and epoxy-based composites cores. The mouldings were produced in semicrystalline and amorphous polymers. Pressure and temperature were recorded at two locations in the cavity. The processing conditions were simulated. The effect of the processing was observed on some dimensions of the part that were used for assessment of the shrinkage and warpage. The results suggest the importance of predicting the regime mould temperature when low thermal conductivity materials are used in moulding blocks. Results also evidenced that in hybrid moulds with resin blocks the shrinkage of the mouldings is a consequence of the specific polymer shrinkage and the deformation of the non-metallic core deformed by the processing pressure. The warpage occurring on these parts is also larger in comparison with conventional steel moulds. DOI : 10.3139/217.2435 En ligne : https://drive.google.com/file/d/1wXHy38Kn2T_X1NFFNEQuP_WVsgglzKic/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12404 [article]

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Molecular orientation behavior of isotactic polypropylene films under uniaxial and biaxial deformation at elevated temperatures / S. Yoshida in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 2 (05/2012) . - p. 237-244 Titre : Molecular orientation behavior of isotactic polypropylene films under uniaxial and biaxial deformation at elevated temperatures Type de document : texte imprimé Auteurs : S. Yoshida, Auteur ; T. Sawada, Auteur ; T. Kawamura, Auteur ; K. Nitta, Auteur Année de publication : 2012 Article en page(s) : p. 237-244 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contraintes (mécanique) Déformations (mécanique) Films plastiques Matériaux -- Déformations géométriques et dimensionnelles Orientation moléculaire (matériaux) Polymères -- Effets des hautes températures Polypropylène Index. décimale : 668.9 Polymères Résumé : In-situ molecular orientation behavior of isotactic polypropylene films prepared by quenching at 0 ºC was investigated under uniaxial and biaxial extension at elevated temperatures. Both the retardation value of film and the stress were simultaneously measured during stretching. The stress required to deform films depended on the stretching temperature, but the retardation was nearly independent of temperature. DOI : 10.3139/217.2527 En ligne : https://drive.google.com/file/d/1p9NXvcVfdamjwve1G-31kkZxUwPd9Pxv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14693 [article]

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Preventing deformation of moldings / Peter Schwarzmann in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 12 (12/2014)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 104, N° 12 (12/2014) . - p. 38-41 Titre : Preventing deformation of moldings : Processing parameters influence the molding geometry Type de document : texte imprimé Auteurs : Peter Schwarzmann, Auteur Année de publication : 2014 Article en page(s) : p. 38-41 Langues : Anglais (eng) Catégories : Anisotropie Composites à fibres courtes Dilatation (thermodynamique) Matériaux -- Déformations géométriques et dimensionnelles Matières plastiques -- Refroidissement Matières plastiques -- Thermoformage Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermoformed parts generally have localized differences in temperature during production. On cooling, the change in length is then always larger at hotter areas than at cooler areas. Excessive temperature-related differences in the change in length inevitably lead to deformation of the moldings. Note de contenu : - Deformation - what happens in the molding ? - Tips and advices in general... - ...with combined cooling using mold and cooling fan, ... - ...with single-sided cooling using only the mold, without cooling air circulation En ligne : https://drive.google.com/file/d/13tY2A1fE5edVCp5PzOG3pfAULaI9CH6k/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22657 [article]

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PVT device : characterizing volumetric and linear deformations of composite materials / Violaine Le Louët in JEC COMPOSITES MAGAZINE, N° 141 (07-08/2021)

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