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Adhesive bonding : providing improved fatigue resistance and damage tolerance at lower costs / A. Kwakernaak in SAMPE JOURNAL, Vol. 44, N° 5 (09-10/2008)

[article]  inSAMPE JOURNAL > Vol. 44, N° 5 (09-10/2008) . - p. 6-15 Titre : Adhesive bonding : providing improved fatigue resistance and damage tolerance at lower costs Type de document : texte imprimé Auteurs : A. Kwakernaak, Auteur ; J. C. J. Hofstede, Auteur Année de publication : 2008 Article en page(s) : p. 6-15 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : With the introduction of adhesive bonding as a replacement for mechanical fastening in aircraft structural components, the mechanical performance of these components can be improved by avoiding stress concentrations. The effect of bonded joint geometry on the stress distribution was examined and the influence of parameter variation on optimisation of the design and the efficiency of the joints was determined. It was shown that combining mechanical fastening and a structural adhesive improved the fatigue strength of a riveted joint significantly, while at the same time the assembly costs could be lowered. Adhesives could be used to manufacture laminated structures that showed better damage tolerance properties than solid monolithic materials and it was shown that by adding high strength fibres to the adhesive bondline of these laminates the fatigue and damage tolerance properties improved markedly. Examples of these structures are presented, together with the effect on weight and cost saving. Note de contenu : - INTRODUCTION : Type of joints compared - STRESS DISTRIBUTION IN BONDED JOINTS : Effect of joint geometry, material and type of adhesive for lap joints - Eccentricity in overlap joint - Joint optimization - ASSEMBLY BONDING - ADHESIVE BONDED LAMINATES - FIBER METAL LAMINATES (FML'S) - WEIGHT AND COST REDUCTION : New and future developments Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23286 [article]

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Large-scale joint fabrication using 3-D fabric preforms, sandwich core structure and VARTM processing / Dirk Heider in SAMPE JOURNAL, Vol. 44, N° 5 (09-10/2008)  

[article]  inSAMPE JOURNAL > Vol. 44, N° 5 (09-10/2008) . - p. 29-34 Titre : Large-scale joint fabrication using 3-D fabric preforms, sandwich core structure and VARTM processing Type de document : texte imprimé Auteurs : Dirk Heider, Auteur ; Hope Deffor, Auteur ; Mira Reuter, Auteur ; J. W. Gillespie, Auteur ; Mansour Mohamed, Auteur ; Roger Crane, Auteur Année de publication : 2008 Article en page(s) : p. 29-34 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 688.4 Matériel du fumeur Résumé : This article investigated the fabrication and performance issues of large-scale composite T-joints. Carbon composite balsacored sandwich panels were fabricated as the horizontal and vertical elements of the T-joints. Four element concepts to join the sandwich panels were evaluated. All joint concepts in this study used a triangular balsa core insert with carbon face sheets made from 2-D and 3-D fabric reinforced materials to transfer load between the vertical and horizontal sandwich panels. The full-scale joint specimens were tested by supporting the ends of the horizontal panel and applying a pull-off load to the vertical member. The sequence of failure events was investigated. The paper outlines the various joining concepts utilizing 3-D preform material and ranks them based on mechanical performance. The study shows clearly the benefit of 3-D fabric as both the improved interlaminar properties and unique dimentional configuration can be used to optimize composite joint design. Note de contenu : - 3-D weaving and novel joining approach - Joint fabrication and testing En ligne : http://www.3tex.com/sites/default/files/3TEX%20-%20Large%20Scale%20Joint%20Fabri [...] Format de la ressource électronique : PDF Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23287 [article]

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Induction welding of thermoplastic polymer composites using robotic techniques / Lars Moser in SAMPE JOURNAL, Vol. 44, N° 5 (09-10/2008)

[article]  inSAMPE JOURNAL > Vol. 44, N° 5 (09-10/2008) . - p. 43-48 Titre : Induction welding of thermoplastic polymer composites using robotic techniques Type de document : texte imprimé Auteurs : Lars Moser, Auteur ; Peter Mitschang, Auteur ; Alois K. Schlarb, Auteur Année de publication : 2008 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Induction welding in a highly efficient and flexible joining process that uses an electromagnetic field for heating the component. An inductor moves above the surface providing a contact-free heat input limited to the bonding zone. Afterwards, the weld is consolidated under pressure. The component can be utilized immediately as no curing time is necessary. Up to now, this technology was limited to flat geometries. In the framework of an industrial cooperative research, the process was enhanced to 3D geometries for joining of complex shaped components. A newly development welding unit integrating the heating and consolidation fonction is handled by a six-axis industrial robot allowing cured 3D seam design. This setup was used for welding single lap joints of GF/PA6 that were characterized by mechanical and microscopical analyses. The main parameters force, generator power, and feed were investigated and their influence on the mechanical properties in shown. A comparison between GF/PA6 with local welding filler and CF/PA6 without welding filler is drawn. In case of CF/PA6 the woven fibers are directly heated by the induced magnetic field. Note de contenu : - INDUCTION WELDING BASICS - AUTOMATED THREE-DIMENSIONAL WELDING SET-UP - MATERIALS AND EXPERIMENTATION: Materials - Welding equipment - RESULTS AND DISCUSSION: Glass fiber reinforced Polyamide 6 - Carbon fiber reinforced Polyamide 6 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23291 [article]

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