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Metal prepreg filament winding / Brian Gordon in SAMPE JOURNAL, Vol. 42, N° 5 (09-10/2006)  

[article]  inSAMPE JOURNAL > Vol. 42, N° 5 (09-10/2006) . - p. 6-11 Titre : Metal prepreg filament winding Type de document : texte imprimé Auteurs : Brian Gordon, Auteur Année de publication : 2006 Article en page(s) : p. 6-11 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : MetPregâ„¢ is a technology in which fiber reinforced metals are produced using all the traditional composite processing techniques such as pultrusion, filament winding, tape placement, hot pressing, and vacuum bagging. This work is significant for applications where the high specific properties and temperature capability of metal matrix composites provide benefits over conventional monolithic metals and organic composites. Touchstone's metal matrix composite (MMC) technology has advanced significantly in the area of filament winding. Hydrostatic burst testing has been conducted on cylinders produced with both hoop and helical plies under conditions that produce a biaxial stress state in the cylinder wall. This testing will lead to the development and refinement of predictive models that can be used for designing optimized pressure vessels and other types of containers. For example, the combination of high strength and low permeability of MMC materials makes them good candidates for storing hydrogen for the new hydrogen-based economy. The MMC filament winding process is being scaled up for producing larger cylindrical sections, and future modifications will improve current end dome capabilities. This paper describes Touchstone's recent efforts to advance this unique technology. Note de contenu : - EXPERIMENTAL : Materials - Filament winding process - Test specimens - Test fixtures - RESULTS AND DISCUSSION : Tension test results - Torsion test results - Hydostatic burst test results En ligne : http://www.metpreg.com/documents/Metal_Prepreg_Filament_Winding_MetPreg_SAMPE_10 [...] Format de la ressource électronique : PDF Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23459 [article]

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Automation implementation and process development of thermoplastic tape placement for 3-dimensional parts / Markus Steeg in SAMPE JOURNAL, Vol. 42, N° 5 (09-10/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 5 (09-10/2006) . - p. 18-24 Titre : Automation implementation and process development of thermoplastic tape placement for 3-dimensional parts Type de document : texte imprimé Auteurs : Markus Steeg, Auteur ; Ralf Schledjewski, Auteur ; Alois K. Schlarb, Auteur Année de publication : 2006 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : The paper describes the development steps of a thermoplastic tape placement head, the requirements concerning the tape quality, the process limitations regarding the presentable in-plane radii, impacts of low axial angle deviations on the tape placement head, and evaluates the laminate quality achievable by in-situ consolidation. Note de contenu : - PROCESS DEVELOPMENT - CONSOLIDATION - THERMODYNAMIC MODEL : Modeling the heat transfer - MATERIAL SPECIFIC PROCESSING PROBLEMS AND LIMITATIONS - TECHNOLOGY IMPLEMENTATION AND TAPE PLACEMENT RESULTS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23466 [article]

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Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements / Robert L. Crane in SAMPE JOURNAL, Vol. 42, N° 5 (09-10/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 5 (09-10/2006) . - p. 35-38 Titre : Assessment of adhesively bonded aluminium joints by high frequency dielectric measurements Type de document : texte imprimé Auteurs : Robert L. Crane, Auteur ; David Hayward, Auteur ; Barry McConnell, Auteur ; Richard A. Pethrick, Auteur ; Anthony J. Mulholland, Auteur ; Sean McKee, Auteur ; Cameron MacKay, Auteur Année de publication : 2006 Article en page(s) : p. 35-38 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : The most significant environmental factor in the degradation of adhesively bonded aluminium joints is moisture ingress. Water degrades the adhesive by plasticisation and hydrolysis, leading to failure with in the adhesive, it hydrates the oxide layer disrupting the adhesive/metal interface leading to interfacial failure. Since water is a polar material dielectric measurements are an effective means of detecting water at low concentrations. Dielectric techniques which use the aluminium adherends as the electrodes are capable of non-destructive measurement within a joint without the use of embedded sensors and if the frequencies employed are high enough (~GHz) then spatial information (~cms) on the water distribution should be available. In addition measurements over a large frequency spectrum can yield information on the interaction of the water within the adhesive, important in deducing the mechanisms by which the water diffuses through the adhesive and the interface. Note de contenu : - THEORY - EXPERIMENTAL : Geometry recovery - Aging studies - RESULTS AND DISCUSSION : Geometry recovery - Aging studies Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23467 [article]

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Ten common mistakes in composite design and manufacture and how to avoid them / S. T. Peters in SAMPE JOURNAL, Vol. 42, N° 5 (09-10/2006)

[article]  inSAMPE JOURNAL > Vol. 42, N° 5 (09-10/2006) . - p. 53-59 Titre : Ten common mistakes in composite design and manufacture and how to avoid them Type de document : texte imprimé Auteurs : S. T. Peters, Auteur Année de publication : 2006 Article en page(s) : p. 53-59 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : The design process for any composite involves both laminate and component design and must also include considerations of the manufacturing process and eventual environmental exposure. These steps are all interdependent with composites and the most efficient design must involve true concurrent engineering. The requirements of concurrent design mean that someone from Materials and Processes, Manufacturing, or Manufacturing Engineering on the design team be aware of some of the pitfalls still inherent in composite design. Too many times, in spite of the most sophisticated computer routines and the most powerful FEA analyses the design and manufacturing process develop problems because of some minor anomaly that could have been avoided with the right experience. The following are tips gleaned from many sources along with this author's own mistakes. As far as can be ascertained, the composite community is still making the same mistakes that were prevalent when the advanced composites era started. The following summarizes several of the subjects that the composite designer should be aware as a list titled ten common mistakes: 1) Inappropriate Laminate Configuration Including appropriate areas for and contrary to quasi-isotropic laminates and balance and symmetry options 2) Not Preparing for Outer Surface Damage to Composite 3) Ignoring Corrosion Concerns 4) Selecting a Manufacturing Method for the wrong reasons 5) Inattention to out-of-plane or unanticipated loads 6) Inattention to subsequent joining/bonding requirements 7) Inattention to tooling requirements 8) Not combining substructures 9) Not using appropriate design allowables or knockdowns 10) Inattention to cost considerations related to tolerances, production quantities, joints, machining, surface finish, and inspectability. Note de contenu : - INTRODUCTION : If you cannot produce the component, the most elegant composite design is worthless - MATERIAL CONSIDERATIONS : Unidirectional composites - Quasi-isotropic composites - Omitting balance and symmetry option - Not preparing for outer surface damage to composite - Ignoring corrosion concerns - MANUFACTURING CONCERNS : Selecting a manufacturing method for the wrong reasons - Inattention to out-of-plane or unanticipated loads - Inattention to hygrothermal stresses Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23468 [article]

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