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Chemical reactivation of exterior decorative aerospace topcoats / D. H. Berry in SAMPE JOURNAL, Vol. 49, N° 2 (03-04/2013)

[article]  inSAMPE JOURNAL > Vol. 49, N° 2 (03-04/2013) . - p. 7-13 Titre : Chemical reactivation of exterior decorative aerospace topcoats Type de document : texte imprimé Auteurs : D. H. Berry, Auteur ; J. A. Bolles, Auteur ; J. E. Seebergh, Auteur ; S. Bateman, Auteur Année de publication : 2013 Article en page(s) : p. 7-13 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Avions -- Revêtements:Avions -- Peinture Polyuréthanes Réactivité (chimie) Revêtements -- Finition Traîtements de surface Index. décimale : 667.6 Peintures Résumé : Exterior aerospace topcoats are typically highly cross-linked polyurethane based paints designed to be resistant to UV degradation with a high level of adhesion required during all aspects of flight. These topcoats are also designed to be resistant and inert to a variety of aggressive solvents and airplane fluids. Consequently, during processing, a topcoat surface can be inert to the reception of the next topcoat layer. Proper surface preparation of each paint layer prior to the application of the next is critical for ensuring adequate adhesion. Historically, the only viable method to prevent de-bonding of cured paints has been to mechanically abrade (sand) prior to the application of subsequent coating layers. However, sanding is an ergonomically hazardous process, adds process flow time, and produces contamination. In addition, sanding intricate stencil lettering in most cases is not feasible without tearing the stencil material and/or leaving visible scratches in the areas immediatly surrounding the stencil markings. Chemical reactivation using a newly developed alkoxide-based chemical reactivator has proven to be a viable alternative to scuff sanding and has been successfully implemented on multiple aerospace platforms. This paper discusses the properties and application process of aerospace decorative livery, the mechanism and tests available for rain erosion durability and the performance of paint layers bonded by the chemical reactivation process. Note de contenu : - EXPERIMENTAL MATERIALS AND METHODS : Materials - Application methods - MATERIAL DEVELOPMENT AND MECHANISM TESTING - RESULTS : Qualification test methods - Rain erosion resistance - Hydraulic fluid resistance - IMPACT RESISTANCE : Initial and weathered appearance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18009 [article]

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Experimental-comparative investigation of the effects of various process parameters on drilling CFRP / B. Deger in SAMPE JOURNAL, Vol. 49, N° 2 (03-04/2013)

[article]  inSAMPE JOURNAL > Vol. 49, N° 2 (03-04/2013) . - p. 20-24 Titre : Experimental-comparative investigation of the effects of various process parameters on drilling CFRP Type de document : texte imprimé Auteurs : B. Deger, Auteur ; O. Bahtiyar, Auteur ; F. Sonat, Auteur Année de publication : 2013 Article en page(s) : p. 20-24 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de carbone Coupe Défauts Epoxydes Perçage et alésage Renforts textiles Tissés Tolérance (technologie) Usinage Index. décimale : 620.19 Autres matériaux Résumé : Carbon Fiber Reinforced Plastic (CFRP) materials have superior properties such as high strength-to-weight ration, elasticy and corrosion resistance which makes them highly preferred materials, especially in aerospace structures. Despite drastic increase in applications of CFRP, the machining processes of this material have been troublesome due to several reasons such as the variety of material configurations, their non-homogeneous mechanical properties and abrasive nature of their fibers. Typical and comMon CFRP machining problems are : defects formed on work piece such as delaminations, unconformities of dimensional tolerances and poor cutting tool life. In addition to the challenge of manufacturing a defect free part, potential quality issues may differ from one material to another even if the cutting conditions are same. Therefore ; presenting effects of the fundamental process parameters such as work piece material, cutting tool configuration (i.e. geometry and material) and cutting parameters is extremely crucial so as to eliminate or minimize these problems and to define efficient CFRP machining strategies. The aim of this study was to investigate effects of process parameters on cutting forces, hole tolerances and defect formation through experimental and comparative approach. In this paper ; polycrystalline diamond (PCD), diamond coated carbide and uncoated carbide drills with several geometries are used in standard modulus 5-harness satin woven CFRP epoxy system. Note de contenu : - EXPERIMENTATION : Materials - Cutting tools - EXPERIMENTAL PROCEDURE - RESULTS : Experimental results of DCC drills - EXPERIMENTAL RESULTS OF PCD DRILLS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18010 [article]

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Machining and drilling of Carbon Fiber Reinforced Plastic (CFRP) composites / J. Miller in SAMPE JOURNAL, Vol. 49, N° 2 (03-04/2013)

[article]  inSAMPE JOURNAL > Vol. 49, N° 2 (03-04/2013) . - p. 36-46 Titre : Machining and drilling of Carbon Fiber Reinforced Plastic (CFRP) composites Type de document : texte imprimé Auteurs : J. Miller, Auteur ; E. D. Eneyew, Auteur Année de publication : 2013 Article en page(s) : p. 36-46 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de carbone Coupe Perçage et alésage Usinage Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of carbon fiber reinforced polymers (CFRP) has been steadily increasing because of superior specific strength, corrosion resistance, and fatigue performance. Machining of CFRP structures is often necessary for achieving final dimensions following cure and for assembly operations. Edge trimming or milling is the mot common secondaryprocessing method for achieving net engineering geometry and hole drilling is the most common method for producing features necessary for assembly. There are significant differences between the machining of metals and composites due to the inhomogeneity and anisotropy of the material system. The choice of constituent materials and fiber orientation has the most significant influence on the cutting process. A common concern when drilling and trimming CFRP materials is machining quality, which is essential for dimensional accuracy, and minimizing defects. Chip formation modes, abrasiveness of the fibers, cutting tool selection, and cutting conditions impact hole and edge quality of machined components. This paper will provide some recent experimental results along with a review of the issues and challenges for edge trimming and drilling of CFRP materials Note de contenu : - EXPERIMENTAL WORK : Edge trimming and drilling experiments. Materials - Experimental procedures - RESULTS AND DISCUSSIONS : Edge trimming - PCD and carbide cutters - Abrasive diamond cutters - Drilling - Abrasive waterjet cutting and trimming Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18011 [article]

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