Relevant bibliographies by topics / Composites variables et anisotropes

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Academic literature on the topic 'Composites variables et anisotropes'

Author: Grafiati
Published: 14 September 2024

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Journal articles on the topic "Composites variables et anisotropes"

1

Ducret, D., R. El Guerjouma, M. Dubuget, and J. C. Baboux. "Caractérisation ultrasonore de l’élasticité et de l’endommagement anisotropes des matériaux composites." Matériaux & Techniques 88, no. 9-10 (2000): 3–7. http://dx.doi.org/10.1051/mattech/200088090003.

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2

Gavarri, J. R., P. Boher та A. W. Hewat. "Monoxyde PbOα(II): Élasticité et vibrations anisotropes; modélisation; constantes élastiques". Journal of Solid State Chemistry 58, № 1 (1985): 87–97. http://dx.doi.org/10.1016/0022-4596(85)90271-3.

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3

Hall, Richard B. "A Thermodynamic Framework for Viscoplasticity Based on Overstress (VBO)." Journal of Engineering Materials and Technology 127, no. 4 (2005): 369–73. http://dx.doi.org/10.1115/1.1924562.

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A thermodynamic framework is presented for the theory of Viscoplasticity Based on Overstress (VBO) developed by Krempl and co-workers (Krempl, E., and Ho, K., 2001, in Lemaitre Handbook of Materials Behavior Models, Academic Press, New York, pp. 336–348; 2000, in Time Dependent and Nonlinear Effects in Polymers and Composites, ASTM STP 1357, Schapery, R. A., and Sun, C. T., eds., ASTM, West Conshohocken, PA, pp. 118–137; Cernocky, E. P., and Krempl, E., 1979, Int. J. Non-Linear Mech., 14, pp. 183–203; Gomaa et al., 2004, Int. J. Solids Struct., 41, pp. 3607–3624), for anisotropic materials and small deformations. A Caratheodory-based approach is applied to demonstrate the existence of entropy and absolute temperature, as previously described by Hall (2000, Compos. Sci. Technol., 60, pp. 2581–2599). The present framework indicates that the stress rate-dependent term in the established growth law for the equilibrium stress cannot contribute to the dissipation, and is therefore referred to here as the elastic equilibrium stress rate. A new temperature rate-dependent term is obtained for the same growth law, which is also required to be dissipationless. These terms are therefore identified with dissipationless changes of the stored energy and∕or entropy. In general, the traditional, and thermodynamically justified, forms for the potential functions that arise in the present nonequilibrium treatment lead to dissipationless contributions from internal variable growth law terms that are linear in the rates of the controllable variables. Similar indications, without first establishing entropy and absolute temperature existence, were noted in the modeling of Lehmann (1984, in The Constitutive Law in Thermoplasticity, T. Lehmann, ed., Springer, New York).
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4

Chater, R., J. R. Gavarri, and A. W. Hewat. "Évolution structurale sous pression de NiSb2O4: Compressibilités anisotropes et ordre magnetique." Journal of Solid State Chemistry 67, no. 1 (1987): 98–103. http://dx.doi.org/10.1016/0022-4596(87)90344-6.

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5

Chater, R., and J. R. Gavarri. "Evolution structure entre 2 et 300 K de l'oxyde MnSb2O4: Proprie´te´se´lastiques et magne´tiques anisotropes." Journal of Solid State Chemistry 59, no. 1 (1985): 123–31. http://dx.doi.org/10.1016/0022-4596(85)90359-7.

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6

Chater, R., J. R. Gavarri, and A. Hewat. "Structures isomorphes MeX2O4—Evolution structurale entre 2 K et 300 K de l'antimonite FeSb2O4: Elasticité et ordre magnétique anisotropes." Journal of Solid State Chemistry 60, no. 1 (1985): 78–86. http://dx.doi.org/10.1016/0022-4596(85)90166-5.

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7

Djibril, Oumar. "Examen de la Dette Extérieure Publique D’un Pays à Revenu Intermédiaire par une Approche D’indicateur de Sutenabilité: le cas de la Côte d’Ivoire." European Scientific Journal, ESJ 18, no. 28 (2022): 94. http://dx.doi.org/10.19044/esj.2022.v18n28p94.

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Cette étude examine la soutenabilité de la dette extérieure de la Côte d’Ivoire, pays à revenu intermédiaire avant et après son élection à l’IPPTE[1] en 2012, date cruciale de son histoire par l’approche de l’Indicateur de Soutenabilité de la Dette (ISD). Les résultats de l’étude montrent que son niveau d’endettement extérieur pose un problème de soutenabilité avant la période de l’atteinte du point d’achèvement mais relativement moins après. Le recours à la mesure de l’ISD fondé sur des variables socioéconomiques composites permet de conclure que la Côte d’Ivoire s’appauvrit empiriquement au plan socio-économique en dépit de son taux d’endettement s’inscrivant dans les normes de l’UEMOA (<70% du PIB). La dette extérieure étant insoutenable, sa bonne gestion et le recours régulier aux opérations d’emprunts obligataires et l’exploitation des avantages comparatifs sont à encourager.
 
 [1] Initiative Pays pauvres très endettés (IPPTE) ; solution qui a pour objectif de rendre la dette extérieure des pays pauvres soutenable. Elle est lancée par les Institutions de Bretton Woods depuis 1996.
 
 This paper examines alternatively the sustainability of Ivorian external indebtedness through HIPCs issue before and after the year 2012, a key date of Côte d’Ivoire’s history. The study takes into account social and economic variables instead of economic indicators only used by international financial institutions (IFI) and other studies. With reference to debt sustainability indicator (DSI) analysis focused on economic and also social variables provided, this study outlines the state of highly indebted poor country in terms of lack of social infrastructures before the initiative and after. Therefore, after the achievement point, the result remains relatively the same. As a matter of fact, these findings justify the poorest state of Côte d’Ivoire: the external debt is therefore unsustainable. From our findings, good external debt management, the regular using of financial bonds market and exploiting comparative advantages are encouraged.
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8

Koadri, Zainate, Azzedine Benyahia, Nadir Deghfel, Kamel Belmokre, Brahim Nouibat, and Ali Redjem. "Étude de l’effet du temps de traitement alcalin de fibres palmier sur le comportement mécanique des matériaux à base d’argile rouge de la région de M’sila." Matériaux & Techniques 107, no. 4 (2019): 404. http://dx.doi.org/10.1051/mattech/2019031.

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Ce travail s’inscrit dans le développement de matériaux locaux, telle que la fibre végétale (fibre de palmier) et l’argile rouge du sud Algérien, largement utilisées dans la préparation des briques, comme matériaux de construction rurale. Les fibres végétales possèdent des propriétés très intéressantes, elles sont : renouvelables, biodégradables et le rapport coût/légèreté faible. Leurs propriétés mécaniques sont très importantes. Cependant, le problème prédominant dans ce type de matériaux composites est la faible adhésion de l’interface matrice-fibre, attribuée probablement, à la nature de la surface et au caractère hydrophobe des fibres naturelles, conduisant ainsi, à des propriétés mécaniques faibles pour le composite envisagé. Le but de cette étude consiste à traiter la fibre de palmier par une solution basique d’hydroxyde de sodium (NaOH 4 % [m/v]) durant des périodes variables : 3, 7, 24 et 48 heures, afin d’améliorer l’adhésion interfaciale. Les résultats obtenus à partir des essais réalisés sur le composite renforcé par les fibres de palmier traitées durant 7 h ont montré une nette augmentation quant à la résistance, à la flexion et à la compression ; cette croissance est respectivement de l’ordre de 57 et 60 %, comparativement au composite renforcé par les fibres non traitées. On peut déduire que les fibres de palmier peuvent être considérées comme l’un des matériaux appropriés pour le renforcement de l’argile.
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9

Shange, Musawenkosi G., Nduduzo L. Khumalo, Samson M. Mohomane, and Tshwafo E. Motaung. "Factors Affecting Silica/Cellulose Nanocomposite Prepared via the Sol–Gel Technique: A Review." Materials 17, no. 9 (2024): 1937. http://dx.doi.org/10.3390/ma17091937.

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Cellulose/silica nanocomposites, synthesised through the sol–gel technique, have garnered significant attention for their unique properties and diverse applications. The distinctive characteristics of these nanocomposites are influenced by a range of factors, including the cellulose-to-silica ratio, precursor concentration, pH, catalysts, solvent selection, temperature, processing techniques, and agitation. These variables play a pivotal role in determining the nanocomposites’ structure, morphology, and mechanical properties, facilitating tailoring for specific applications. Studies by Raabe et al. and Barud et al. demonstrated well-deposited silica nanoparticles within the interstitial spaces of cellulosic fibres, achieved through TEOS precursor hydrolysis and the subsequent condensation of hydroxyl groups on the cellulose fibre surface. The introduction of TEOS established a robust affinity between the inorganic filler and the polymer matrix, emphasising the substantial impact of TEOS concentration on the size and morphology of silica nanoparticles in the final composites. The successful functionalisation of cellulose fibres with the TEOS precursor via the sol–gel method was reported, resulting in reduced water uptake and enhanced mechanical strength due to the strong chemical interaction between silica and cellulose. In research conducted by Feng et al., the silica/cellulose composite exhibited reduced weight loss compared to the pristine cellulose matrix, with the integration of silica leading to an elevated temperature of composite degradation. Additionally, Ahmad et al. investigated the effects of silica addition to cellulose acetate (CA) and polyethylene glycol membranes, noting an increase in Young’s modulus, tensile strength, and elongation at break with silica incorporation. However, concentrations exceeding 4% (w/v) resulted in significant phase separations, leading to a decline in mechanical properties.
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10

Atallah, Eyad, Lance F. Bosart, and Anantha R. Aiyyer. "Precipitation Distribution Associated with Landfalling Tropical Cyclones over the Eastern United States." Monthly Weather Review 135, no. 6 (2007): 2185–206. http://dx.doi.org/10.1175/mwr3382.1.

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Abstract Tropical cyclones (TCs) making landfall over the United States are examined by separating those associated with precipitation predominantly left of their tracks from those with the same to the right of their tracks. Composites of atmospheric variables for these two TC categories are performed and analyzed using potential vorticity (PV) and quasigeostrophic (QG) frameworks. Dynamical signatures are retrieved from these composites to help understand the evolution of precipitation in these storms. Results indicate that a left of track precipitation distribution (e.g., Floyd 1999) is characteristic of TCs undergoing extratropical transition (ET). In these cases, a positively tilted midlatitude trough approaches the TC from the northwest, shifting precipitation to the north-northwest of the TC. Potential vorticity redistribution through diabatic heating leads to enhanced ridging over and downstream of the TC, resulting in an increase in the cyclonic advection of vorticity by the thermal wind over the transitioning TC. A right of track precipitation distribution is characteristic of TCs interacting with a downstream ridge (e.g., David 1979). When the downstream ridge amplifies in response to TC-induced diabatic heating ahead of a weak midlatitude trough, the PV gradient between the TC and the downstream ridge is accentuated, producing a region of enhanced positive PV advection (and cyclonic vorticity advection by the thermal wind) over the TC. The diabatic enhancement of the downstream ridge is instrumental in the redistribution of precipitation about the transitioning TCs in both cases and poses a significant forecast challenge.
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