| Titre : |
Micro-residual stress measurement in nanocomposite reinforced polymers |
| Type de document : |
texte imprimé |
| Auteurs : |
H. R. Ziaei Moghadam, Auteur ; S. A. Faghidian, Auteur ; Majid Jamal-Omidi, Auteur ; S. Rahmati, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 356-366 |
| Langues : |
Anglais (eng) |
| Catégories : |
Composites à fibres de carbone
Contraintes résiduelles
Eléments finis, Méthode des
Epoxydes
Fraisage
Matériaux hybrides
Nanotubes de carbone à parois multiplesUn nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets :
- le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ;
- le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier.
Stratifiés -- Propriétés mécaniques
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
In the present study, residual stress is measured in fiber-reinforced SWCNT/epoxy at weight fractions of 0.1% and 0.5% with a cross-ply layup on a micro-scale. The mechanical properties of the SWCNT/epoxy composites were determined by tensile testing and the Young's modulus of the epoxy increased moderately with the addition of CNTs. The micro-residual stress of the cross-ply CF/epoxy and CNF-reinforced CF/epoxy laminates were measured using a new experimental approach. The micro-hole was milled by laser beam and the surface displacement was recorded by SEM after milling. In order to determine the residual stress from the recorded strain, the calibration matrix was calculated using the finite element method. The residual stress was obtained at a certain hole depth of specimens. The reliability of this approach was assessed by comparing the residual stress measurements from this method and from the standard hole-drilling method. The experimental results of the present approach confirmed that laser hole drilling SEM-DIC has excellent potential as a reliable method for measuring residual stress in polymer nanocomposites. Generally, CNT agglomerates, especially in high weight fractions, increased the micro-residual stress. An analytical method based on classical theory was used to calculate the residual stress and was compared with the experimental results. Good agreement was found between the results of the analytical methods and the experimental measurement. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE
- RESIDUAL STRESS MEASUREMENT : Laser SEM-DIC method - Obtaining full field strains
- FINITE ELEMENT MODELING
- ANALYTICAL ANALYSIS |
| DOI : |
https://doi.org/10.3139/217.3756 |
| En ligne : |
https://www.degruyter.com/document/doi/10.3139/217.3756/pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32897 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 3 (07/2019) . - p. 356-366
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