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Prediction of impact damage in composite sandwich plates / Mohamad Abdul Wahab in MATERIAUX & TECHNIQUES, Vol. 107, N° 2 (2019)  

[article]  inMATERIAUX & TECHNIQUES > Vol. 107, N° 2 (2019) . - 12 p. Titre : Prediction of impact damage in composite sandwich plates Type de document : texte imprimé Auteurs : Mohamad Abdul Wahab, Auteur ; Tony Jabbour, Auteur Année de publication : 2019 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de dommages (matériaux) Cisaillement (mécanique) Composites Construction sandwich -- Détérioration Endommagement (mécanique) Impact (mécanique) Rupture (mécanique) Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : This study tracks the development of an analytical model, designed to investigate the dynamic response of a composite sandwich plate subjected to a low-velocity impact. The model is based on the thick anisotropic plate theory, developed by Reddy and Pagano, which takes into account a through-thickness shear. An indentation law, as proposed by Hertz, is used to model the local response under the impactor. The good correlation between the shock and the simulation results testifies the validity of the method as far as the prediction of the contact force and the shear deformation in the core are concerned. Note de contenu : - DYNAMIC MODEL : Equations of motion - Determination of the transverse displacement of the plate - Localized loading - METHOD OF RESOLUTION : Contact force - Displacement of the impactor - RESULTS AND DISCUSSION : Contact force and displacement - Prediction of damage - Damage of clamped sandwich panels - Influence of damage on the natural frequencies of a sandwich structure - Observations - Failure criterion - Calculation of shear deformations in the PVC1 core - Criterion of the maximum shear deformation Référence de l'article : 201 DOI : 10.1051/mattech/2019006 En ligne : https://www.mattech-journal.org/articles/mattech/pdf/2019/02/mt180062.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32769 [article]

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Characterization of the ageing of an epoxy resin using high temperature nanoindentation / Bruno Passilly in MATERIAUX & TECHNIQUES, Vol. 107, N° 2 (2019)  

[article]  inMATERIAUX & TECHNIQUES > Vol. 107, N° 2 (2019) . - 6 p. Titre : Characterization of the ageing of an epoxy resin using high temperature nanoindentation Type de document : texte imprimé Auteurs : Bruno Passilly, Auteur ; Romain Delannoy, Auteur Année de publication : 2019 Article en page(s) : 6 p. Note générale : Bibliogr. Langues : Français (fre) Catégories : Analyse mécanique dynamique Caractérisation Durée de vie (Ingénierie) Elasticité Epoxydes Hautes températures Indentation des matériaux Matières plastiques -- Détérioration Nanoindentation Index. décimale : 668.4 Plastiques, vinyles Résumé : This article aims to understand better the mechanical properties and behavior of organic matrix composite materials under elevated temperature conditions. Two specific specimens of cured RTM6 epoxy resin are tested with DMA analysis: one being unaged and the other one aged for 5000 h at 130 °C under ambient air. Anti-plasticization effects seem to occur on aged resin. Series of nano-indentation tests are carried out from the surface to the core of the sample so as to measure gradient properties of the resin, at temperatures up to 150 °C using a high temperature indentation machine prototype. Thermo-oxidation phenomena involve oxidized layer formation during thermal ageing of the epoxy resin which is characterized through measurements of indentation Young’s modulus. After aged treatment, the variation of Young’s modulus of the oxidized layer at the surface of the sample is not clearly affected by the increasing test temperature whereas Young’s modulus of the core of the sample is decreasing significantly with the temperature test as on unaged epoxy resin. Thus, asymptotic growing of the oxidized layer is then confirmed. Note de contenu : - SAMPLES PREPARATION - INSTRUMENTATION HIGH TEMPERATURE NANOINDENTATION : High temperature nanoindentation apparatus - Loading and unloading cycle - Determination of the mechanical properties - HIGH TEMPERATURE MECHANICAL PROPERTIES OF EPOXY RESIN : DMA results - Effect of ageing - Unaged resin characterization - Aged resin characterization Référence de l'article : 206 DOI : 10.1051/mattech/2019004 En ligne : https://www.mattech-journal.org/articles/mattech/pdf/2019/02/mt180080.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32770 [article]

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Matériaux & techniques Vol. 107, N° 2 URL