Better dimensional accuracy through high pressure / Gottfried Wilhelm Ehrenstein in KUNSTSTOFFE INTERNATIONAL, Vol. 98, N° 1/2008 (01/2008)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 98, N° 1/2008 (01/2008) . - p. 48-52 Titre : Better dimensional accuracy through high pressure Type de document : texte imprimé Auteurs : Gottfried Wilhelm Ehrenstein, Auteur ; Natalie Rudolph, Auteur ; Ernst Schmachtenberg, Auteur Année de publication : 2008 Article en page(s) : p. 48-52 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : Process technology - A novel process converts plastics from the melt to the solid state solely by pressure, not by the conventional method of cooling under pressure. It can be used in injection molding and stamping, but also in extrusion. The parts produced in this way are characterized by an absence of inherent stresses and high dimensional accuracy because they are never simultaneously in a molten and solid state, in which there are significant differences in important properties. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6659 [article]

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A change of length has consequences / Natalie Rudolph in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 2 (2021) . - p. 42-45 Titre : A change of length has consequences : The coefficient of thermal expansion can help to sensure product quality Type de document : texte imprimé Auteurs : Natalie Rudolph, Auteur Année de publication : 2021 Article en page(s) : p. 42-45 Langues : Anglais (eng) Catégories : Analyse thermomécanique Composites -- Délaminage Composites à fibres Composites à fibres -- Moulage par injection Dilatation (thermodynamique) Fibres à orientation unidirectionnelle Mesure Polyéther éther cétone Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The design of parts and components made of fiber-reinforced composites needs to take the coefficient of thermal expansion into account because it determines the extent to which a material changes in length when heated or cooled. Neglecting this quality criterion can have far-reaching consequences. Note de contenu : - TMA as tool for studying the expansion behavior - An understanding of anisotropy is critical to high-performance composites - Different coefficients of expansion in different directions - How does the thermal expansion correlate to the flow field ? - Determining time to delamination of electronic assemblies - Fig. 1 : TMA measurement on a PP-GF-UD composite material. Sample size 25 mm, heating rate 5 K/min from –70 °C to 140 °C, N2 atmosphere, expansion sample holder made of fused silica - Fig. 2 : a) Sample extraction location, b) dominant fiber orientation - Fig. 3 : TMA measurement results of PEEK with short carbon fibers from different part locations; sample 1 = orange; sample 2 = red; sample 3 = green - Fig. 4 : Determination of time to delamination on an FR4 composite circuit board. Sample size 6.35 mm2 as defined by IPC standard, dried for 2 h pre-measurement at 105 °C, heating rate 10K/min, N2 atmosphere, sample holder made of fused silica En ligne : https://drive.google.com/file/d/1SMBww_r2xyAosNvyA0-MpYBYKSBW9mdp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35498 [article]

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Making the first 3D-printed carbon fibre bike / Natalie Rudolph in JEC COMPOSITES MAGAZINE, N° 125 (11-12/2018)  

[article]  inJEC COMPOSITES MAGAZINE > N° 125 (11-12/2018) . - p. 51-53 Titre : Making the first 3D-printed carbon fibre bike Type de document : texte imprimé Auteurs : Natalie Rudolph, Auteur ; Danning Zhang, Auteur ; Peter Woytowitz, Auteur Année de publication : 2018 Article en page(s) : p. 51-53 Langues : Anglais (eng) Catégories : Composites à fibres de carbone Conception technique Fibres à orientation unidirectionnelle Fibres continues Impression tridimensionnelle Polyéther éther cétone Vélo -- Matériaux Index. décimale : 668.4 Plastiques, vinyles Résumé : Thinking about 3D printig evokes images of customized prosthetics, printable organs, and even houses and many more customized products that are produced locally. However, after the hype of the last couple of years,many realized that the industry is still focusing on prototyping and mould making rather than manufacturing functional end-use parts. There are various reasons for this holdup, but one of the major weaknesses is the low mechanical performance of the plastic material itself, and especially of the interfaces between layers. Note de contenu : - 3D printing with continuous carbon fibre - True3D process - Geometric, aesthetic, and structural challenges - From prototyping to manufacturing - Different printing parameters - Fig. 1 : Example of True3D path on a chain stay - Fig. 2 : Arevo design software workflow - Fig. 3 : Left: Specific tensile modulus of a unidirectional layup in comparaison to typical mental bike frame materials; Right: Cross-section of the CF-PEEK filament with a 50 vol% fibre volume cintent and void content <1% - Fig. 4 : Optimized material thicknesses - Fig. 5 : Analysis results for a frame subkect to a 2000N vertical seat load - Fig. 6 : Top: Schematic of the printing process including compaction roller and heat input in the form of a laser light - the incident angle of the laser to the substrate or incoming filament, and therefore the absorption, changes; Bottom: Absorption of the laser at different wavelenghts and fibre volume contents as a function of incident angle, which results in less or more heating - Fig. 7 : Arevo's first 3D printed carbon fibre bike En ligne : https://drive.google.com/file/d/1g3RNqoQPWkI_0esUBTTaD-Bzbt3t_WHG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31741 [article]

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Polymer rheology / Tim A. Osswald / München [Germany] : Carl Hanser Verlag (2015)

Titre : Polymer rheology : Fundamentals and applications Type de document : texte imprimé Auteurs : Tim A. Osswald, Auteur ; Natalie Rudolph, Auteur Editeur : München [Germany] : Carl Hanser Verlag Année de publication : 2015 Importance : XI-225 p. Présentation : ill. Format : 25 cm ISBN/ISSN/EAN : 978-1-56990-517-3 Prix : 86 E Note générale : Index - Bibliogr. Langues : Anglais (eng) Catégories : Polymères Rhéologie Index. décimale : 668.9 Polymères Résumé : This book is designed to provide a background in polymer rheology to both engineering students and practicing engineers. It is written at an intermediate level with sufficient technical information and practical examples to enable the reader to understand the interesting and complex rheological behavior of polymers, to make the right decisions regarding rheological testing methods, and to troubleshoot rheology related problems encountered in polymer processing. The organization of the book and the practical examples throughout make it an ideal textbook and reference source. Processors and raw material suppliers will find the information within particularly valuable. Rheology is a rapidly growing and industrially important field, playing a significant role not only in polymer processing, but also in food processing, coaching and printing, and many other manufacturing processes. Note de contenu : 1. Introduction to rheology 2. Structure and properties of deforming polymers 3. Generalized newtonian fluid (GNF) models 4. Transport phenomena 5. Viscoelasticity 6. Rheometry Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25209

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Solidification by pressure instead of cooling / Natalie Rudolph in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 7 (07/2011)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 101, N° 7 (07/2011) . - p. 58-61 Titre : Solidification by pressure instead of cooling Type de document : texte imprimé Auteurs : Natalie Rudolph, Auteur Année de publication : 2011 Article en page(s) : p. 58-61 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par compression Tags : 'Matières  plastiques'  'Moulage  compression'  'Solidification  pression'  'Densification Index. décimale : 668.4 Plastiques, vinyles Résumé : Compression Induced Solidification - If the temperature and pressure gradient over time and position can be avoided during cooling and at the phase change, it is possible to produce parts with excellent homogeneity and dimensional stability. To achieve this, the phase change should not occur postponed during cooling, as has been done until now, but due to simultaneous densification of the entire part volume by pressure. Note de contenu : - Fundamentals of compression induced solidification - Procedure Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14989 [article]

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Understanding plastics recycling / Natalie Rudolph / München [Germany] : Carl Hanser Verlag (2017)

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