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Our-time effects on VBO (Vacuum Bag Only) prepreg and laminate properties / L. K. Grunenfelder in SAMPE JOURNAL, Vol. 47, N° 5 (09-10/2011)

[article]  inSAMPE JOURNAL > Vol. 47, N° 5 (09-10/2011) . - p. 6-13 Titre : Our-time effects on VBO (Vacuum Bag Only) prepreg and laminate properties Type de document : texte imprimé Auteurs : L. K. Grunenfelder, Auteur ; S. R. Nutt, Auteur Année de publication : 2011 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique Composites à fibres de carbone Epoxydes Matériaux -- Imprégnation Moulage à la poche à vide Index. décimale : 668.4 Plastiques, vinyles Résumé : Changes in VBO (vacuum bag only) prepreg properties were tracked as a function of room temperature aging time (out-time). A modulated differential scanning calorimetry method was used to characterize the prepreg, and changes in prepreg tack levels were examined using an energy of separation technique. Laminates were cured from prepreg at various levels of aging using both traditional autoclave processing and low-pressure vacuum bag only (VBO) techniques. Cured laminates were examined using ultrasound scanning, mechanical properties were tested, and laminates were sectioned for examination of microstructure. Laminate quality as a function of out-time is discussed in terms of prepreg properties and manufacturing technique. Note de contenu : - PREPREG CHARACTERIZATION : Modulated differential scanning calorimetry - LAMINATE FABRICATION AND TESTING : Test panels - Laminate characterization. - Prepreg characterization : Modulated DSC - Laminate characterization - Ultrasounds scans - Thickness measurements - Microstructure - Mechanical properties - Age determination and quality prediction Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11842 [article]

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Adhesive characterization using NIAR-modified KGR extensometer / W. P. Seneviratne in SAMPE JOURNAL, Vol. 47, N° 5 (09-10/2011)

[article]  inSAMPE JOURNAL > Vol. 47, N° 5 (09-10/2011) . - p. 37-44 Titre : Adhesive characterization using NIAR-modified KGR extensometer Type de document : texte imprimé Auteurs : W. P. Seneviratne, Auteur ; J. S. Tomblin, Auteur Année de publication : 2011 Article en page(s) : p. 37-44 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Assemblages collés Caractérisation Cisaillement (mécanique) Colles:Adhésifs Contraintes (mécanique) Extensomètre Mesures physiques Index. décimale : 668.3 Adhésifs et produits semblables Résumé : ASTM standard test medhod for thick-adherend metal lap-shear joints for determination of the stress-strain behavior of adhesives in shear by tension loading (D5656) recommends using a KGR extensometer, specially designed to measure the shear deformation of the gage section of single lap or double lap shear specimens. The KGR extensometer is a customade unit that comes with its own signal conditioner. ASTM D5656 is the only currently available standard method generate adhesive shear stress-strain curves that are widely used in the industry for adhesive joint designs. Therefore, the authors have develoed the proposed technique to measure the shear strain for ASTM D 5656 specimens. The NIAR-KGR extensometer method does not require special signal conditioning or specialized extensometers that are limited to use in ASTM D5656 testing. A standard laboratory axial extensometer can be converted to a NIAR-KGR extensometer with the use of the specially designed attachments discussed in thie paper. THE NIAR-KGR technique has no usage limitations for thick bondlines, and test data has been generated for bondline thicknesses up to 5 mm. The use of the NIAR-KGR techynique does not require significant changes to the overall data reduction methodology. The adhesive characteristics generated using the attachments are in several technical reports and publications. Tests results produced using the NIAR-KGR method were comparable to adhesive strain-strain curves obtained using KGR extensometer data. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11843 [article]

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