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Characterizing high-tech composites by means of thermal analysis / Gabriele Kaiser in SAMPE JOURNAL, Vol. 50, N° 1 (01-02/2014)

[article]  inSAMPE JOURNAL > Vol. 50, N° 1 (01-02/2014) . - p. 7-12 Titre : Characterizing high-tech composites by means of thermal analysis Type de document : texte imprimé Auteurs : Gabriele Kaiser, Auteur ; Stefan Schmölzer, Auteur ; Stephan Knappe, Auteur ; D. Rapp, Auteur ; M. Meyer, Auteur ; A. Lindemann, Auteur Année de publication : 2014 Article en page(s) : p. 7-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse diélectrique Analyse mécanique dynamique Analyse thermique Analyse thermomécanique Composites à fibres de carbone Thermogravimétrie Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : Carbon fiber-reinforced plastics (CFRPs) are lighter than aluminum and stiffer than titanium. Due to these exceptional properties, carbon fiber-reinforced polymers are of common interest, especially in the transportation industry and manufacturing of sports goods. Some typical application areas here include aerospace engineering, the automotive industry, motor sports and cycle racing. Additionally, they are corrosion-resistant and can therefore also be exposed to harsh environments. They can also be found in the industrial sector as components for robot arms or pumps, for example. CFRPs consist of a polymer matrix, usually a resin such as epoxy, and embedded reinforcing carbon fibers. Depending on the matrix material, the layout of the reinforcement and its proportion relative to the polymer, the physicochemical and mechanical properties of the composites can vary. For characterization of these properties, it is advantageous to have analysis techniques at hand. Thermal Analysis provides a variety of analytical methods which can be of service. In particular, Differential Scanning Calorimetry (DSC), Dielectric Analysis (DEA), Thermogravimetric Analysis (TGA), Thermomechanical Analysis (TMA), Dynamic-Mechanical Analysis (DMA) and Laser Flash Analysis (LFA) are ideal tools for investigating the curing behavior of the resin matrix or studying the entire composite. This technical article gives an overview of the measurement techniques mentioned and describes how Thermal Analysis can help master tasks in research, development, quality control or failure analysis. Note de contenu : - CURE MONITORING OF THE POLYMER MATRIX : DSC and DEA - Methods and instrumentation - Predicting the degree of conversion of reactive systems - Controlling the manufacturing process - ANALYZING THE COMPOSITION OF THE COMPOSITE : Verifying the carbon content - QUANTIFYING THERMAL EXPANSION DEPENDENCE ON FIBER ORIENTATION : TMA method and instrumentation - Unveiling the impact of the fiber direction of the CTE - DETERMINATION OF THE VISCOELASTIC PROPERTIES OF COMPOSITES : DMA method and instrumentation - DETERMINATION OF THERMAL DIFFUSIVITY AND THERMAL CONDUCTIVITY : Laser flash analysis (LFA) method and instrumentation - Dertermining the relationship between the fiber orientation and thermal diffusivity/thermal conductivity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20479 [article]

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Analysis implementation, verification, validation and performance of a structurally-integrated TPS concept in SAMPE JOURNAL, Vol. 50, N° 1 (01-02/2014)

[article]  inSAMPE JOURNAL > Vol. 50, N° 1 (01-02/2014) . - p. 22-29 Titre : Analysis implementation, verification, validation and performance of a structurally-integrated TPS concept Type de document : texte imprimé Année de publication : 2014 Article en page(s) : p. 22-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Industries aérospatiales -- Matériaux Isolation thermique Protection thermique Revêtement de céramique Stratifiés Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : This technical article describes the analysis implementation of a structurally-integrated thermal protection system (SITPS) concept in the HyperSizer structural sizing software. The software development is focused on integrating structural and thermal analysis methods for vehicle-level design of Highly Reliable Reusable Launch Systems (HRRLS) under the NASA Fundamental Aeronautics program. The unique feature of the SITPS concept is the AETB ceramic core which acts as an insulator between the hot outer surface and the cooler inner surface of the panel. The structural analysis is accomplished using panel homogenization. This results in an effective constitutive equation for the SITPS panel that is suitable for use in a full vehicle-scale finite element analysis. The thermal analysis of the SITPS concept is accomplished using an existing 1-D thermal analysis model that discretizes the structure and insulation into a series of thermal resistors and masses. Vehicle levet sizing studies are included to compare the performance of SITPS to Gr/Ep and Al 2219 honeycomb sandwich concepts with traditional TPS shielding. These studies are used to establish accurate weight statements for a hypersonic SITPS vehicle concept. FEA verification is included in order to assess the accuracy of HyperSizer's eigenvalue predictions. Finally, the 1-D thermal analysis is validated by comparison of the results to published experimental data Note de contenu : - INTRODUCTION : Description of structurally integrated TPS - IMPLEMENTATION : Sizing variable decription - ANALYSIS METHODS : Out-of-pland loads - Buckling stability of the web - FEA sensitivity and verification studies - Material strength of the ceramic laminate - VALIDATION - PERFORMANCE : Vehicle dimensions Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20480 [article]

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