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A study of the non-linear behaviour of adhesively-bonded composite assemblies ArchiMer
Cognard, Jean Yves; Davies, Peter; Sohier, S; Creac' Hcadec, R.
The objective of this study is to define a reliable tool for dimensioning of adhesively bonded assemblies, particularly for marine and underwater applications. This paper presents experimental and numerical results, which describe the non-linear behaviour of an adhesive in a bonded assembly for various loadings. A modified Arcan fixture, well-suited for the study of the behaviour of bonded metal-metal assemblies, was developed in order to focus on the analysis of the behaviour of the adhesive in thin films. The edge effects are minimised by using an appropriate design of the substrates so that experimental results give reliable data. To analyze the kinematics of the deformation of the adhesive joint non-contact extensometry techniques were employed. Thus,...
Tipo: Text Palavras-chave: Non linear behaviour; Finite element; Arcan fixture; Marine structures; Composite; Adhesion.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2079.pdf
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Absorção de água, solubilidade em água, propriedades mecânicas e morfológicas de compósitos de glúten de milho e poli(hidroxibutirato-co-valerato) (PHBV) reforçados com fibras de coco verde. Repositório Alice
CORRADINI, E.; FERREIRA, F. C.; AGNELLI, J. A. M.; MARCONCINI, J. M.; MATTOSO, L. H. C.; ROSA, M. de F..
2013
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Biocompósitos; Fibras de coco-verde; Glúten de milho; Poli; Hidroxibutirato-co-valerato; Composite; Green coconut fibers; Corn gluten meal; Poly; Hydroxybutyrate-cohydroxyvalerate.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/982446
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An experimental study of water diffusion in carbon/epoxy composites under static tensile stress ArchiMer
Humeau, Corentin; Davies, Peter; Jacquemin, Frederic.
The coupling between tensile stress and water diffusion in composites represents a major issue in many marine applications. Even if these two behaviours are well documented as separate subjects, there are still very few data on fully coupled mechanisms. The aim of this study is to understand what governs the coupled behaviour, by investigating the water diffusion in carbon/epoxy. The coupling is first evaluated on neat resin samples to characterise the matrix behaviour. Then the study focuses on composites with two types of woven fibre orientation: one at ±45°, in order to understand the coupling effects on materials loaded away from the reinforcement direction and another quasi-isotropic to obtain properties along the fibres. For each material the same...
Tipo: Text Palavras-chave: Composite; Moisture diffusion; Static tensile stress; Coupled behaviour.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00416/52788/53687.pdf
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Characterization and use of swine deep bedding ashes in cementitious composites REA
Oliveira,Débora C. G. de; Rodrigues,Michelle S.; Santos,Sérgio F. dos; Savastano Junior,Holmer.
The deep bedding is a swine alternative production, especially in the finishing phase, whose byproduct can be recycled, reducing the environmental impact. The objectives of this study were to characterize the ash coming from the controlled burning of the swine deep bedding (SDBA) based on rice husk, and to evaluate their performance in composites as a partial substitute for Portland cement (PC). To measure the differences between SDBA and rice husk ash (RHA) as a reference, we have characterized: particle size distribution, real specific density, x-ray diffraction, electrical conductivity, scanning electron microscopy, chemical analysis and loss on ignition. Samples were prepared for two experimental series: control, and another one with the partial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Composite; Rural construction; Residues; Swine production; Sustainability.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000500001
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Characterization of açaí (E. oleracea) fruits and its processing residues BABT
Pessoa,José Dalton Cruz; Arduin,Marcos; Martins,Maria Alice; Carvalho,José Edmar Urano de.
The aim of this work was to study the source of the açaí residue for its possible commercial applications by characterizing the fruit (fresh and dry mass), and performing an anatomic study of the pericarp from which were identified the origin of the anthocyanins, and fatty acids, and fibers; also the vascular system, its fibers constituents and fibrils were characterized. It was concluded that anthocyanins were located on the epiderm and external parenchyma, and that solids retained on the sieve come from the sclerenchyma, and that the fatty acids come from the storage parenchyma. The vascular tissue was formed by the fibers around 20 mm length. The length distribution of the fibrils had a mean length of 580µm.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fiber; Fibril; Composite; Fatty acid; Anthocyanin.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600022
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Characterization of residual stresses in wound composite tubes ArchiMer
Casari, Pascal; Jacquemin, Frederic; Davies, Peter.
This paper presents a method for the characterization of residual stresses in thick filament wound tubes. The three materials considered in the study are wet wound epoxy composite tubes based on E glass, R glass and T700 carbon fibres with three winding angles, [+/- 35], [+/- 55] and [+/- 851 with respect to the longitudinal axis. The aim of the present work is to measure internal stresses, based on strains liberated by cutting composite tubes, and to compare results with predictions from a residual stress model based on the classical equations of solid mechanics. This leads to a simple technique which allows the quick identification of the effects of manufacturing and moisture on the internal multi-axial stress level.
Tipo: Text Palavras-chave: Moisture; Tube; Composite; Residual stress.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1212.pdf
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Compatibility of vegetable fibers with Portland cement and its relationship with the physical properties AGRIAMBI
Marques,Maria L.; Luzardo,Francisco H. M.; Velasco,Fermin G.; González,Luis Nieto; Silva,Everton J. da; Lima,Wellington G. de.
ABSTRACT The use of vegetable fiber residue in cementitious matrices can be a sustainable technological alternative; however, it still has problems related to the chemical compatibility between the cement and the fibers. The present study evaluated the compatibility of vegetable fibers with cement using three methods of calculation and determined certain physical properties of the fibers and the curve of the temporal evolution of temperature for each composite. The surfaces of the composites were evaluated through atomic force microscope images and the results showed that the pretreatment of fiber washing significantly favors the compatibility with cement for fibers of eucalyptus, coconut and cocoa, with no influence for water hyacinth fiber. Bivariate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aptness; Composite; Lignocellulosic materials; Hydration.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500466
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Composição ótima em composto de Charolês e Nelore baseada em estimativas de efeitos aditivos e heteróicos para pesos. Repositório Alice
ALENCAR, M. M. de; TREMATORE, R. L.; BARBOSA, P. F..
O objetivo deste trabalho foi estimar a composicao genetica otima de um composto das racas Charolesa e Nelore utilizando-se estimativas de efitos aditivos direto e materno do Charoles como desvio de Nelore, e efeitos heteroticos direto e materno entre as duas racas, obtidos para os pesos ao nascimento e a desmama.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Bovinos; Gado Charolês; Gado Nelore; Composto; Composição genética; Charolais; Composite; Genetic composition; Bovidae.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/43861
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Compósito à base de poli(hidroxibutirato) (PHB) reforçado com fibras de rami espécie Bohemeria nivea. Repositório Alice
MARINHO, N. P.; BOLZON de MUÑIZ, G. I.; NISGOSKI, S.; KLOCK, U.; ANDRADE, A. S. de; MAGALHAES, W. L. E..
Fibras de rami da espécie Bohemeria nivea foram usadas como elemento de reforço, nas proporções de 5%, 10% e 15%, para melhorar as propriedades mecânicas nos esforços de tração do poli(hidroxibutirato). Para obtenção das fibras foi utilizado o processo de polpação organosolv com uma taxa de lignina residual (kappa) de k=46,2. Nas diferentes etapas de branqueamento das fibras foram obtidos k=29,2 (1a etapa com ClO2); k=24,3 (2a etapa com H2O2); k=19,0 (3a etapa com ClO2) e k=7,6 (4a etapa com H2O2). Nos ensaios mecânicos de tração o Módulo de Elasticidade (MOE) apresentou baixos Coeficientes de Variação (CV) entre 12,45% e 17,35% e pouca dispersão no Desvio Padrão estando entre 50,41MPa e 65,93MPa para amostras de PHB/rami-15% e PHB/rami-5%,...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Bohemeria nivea; Rami; Compósito; Organosolv; MOE; Módulo de elasticidade; PolihidróxiButirato; Composite; Polyhydroxybutyrate.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1028419
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Étude du comportement non-linéaire d'une colle dans un assemblage ArchiMer
Cognard, Jean-yves; Sohier, Laurent; Davies, Peter; Gineste, Bernard.
The objective of this study is to define a reliable tool for dimensioning of adhesively bonded assemblies, particularly for marine and underwater applications. A modified “Arcan” fixture, suited for the study of the behavior of bonded metal-metal assemblies, was developed in order to focus on the analysis of the behavior of the adhesive in thin films. To analyze the kinematics of the deformation of the adhesive joint non-contact extensometry techniques were employed. Thus various characteristics of the non-linear behavior of the adhesive were observed. The first results obtained for mixed assemblies (steel, aluminium, composite substrates) show similar behaviour of the adhesive using the proposed procedure. Furthermore, quality controls by DSC, and studies...
Tipo: Text Palavras-chave: Ssemblages collés; Modélisation; Essais; Comportement non-linéaire; Composites; Adhesive bonding; Model; Tests; Non linear behaviour; Composite.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00480/59156/61785.pdf
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Evaluation of the durability of composite tidal turbine blades ArchiMer
Davies, Peter; Germain, Gregory; Gaurier, Benoit; Boisseau, Amelie; Perreux, Dominique.
The long term reliability of tidal turbines is critical if these structures are to be cost-effective. Optimised design requires a combination of material durability models and structural analyses. Composites are a natural choice for turbine blades but there are few data available to predict material behaviour under coupled environmental and cycling loading. This paper addresses this problem, by introducing a multi-level framework for turbine blade qualification. At the material scale static and cyclic tests have been performed, both in air and in seawater. The influence of ageing in seawater on fatigue performance is then quantified and much lower fatigue lives are measured after ageing. At a higher level flume tank tests have been performed on three-blade...
Tipo: Text Palavras-chave: Composite; Fatigue; Ageing; Tidal turbine; Flume tank; Finite-element model.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00079/19053/20068.pdf
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La conception de structures navales en sandwich: Un probleme inverse ArchiMer
Holm, D; Esping, B; Romell, O; Campion, F.
An integrated approach is introduced for the solution of the inverse problem: which are the lamina orientation, laminate constitution, core quality and thickness combination ensuring specified objective(s) to be reached? The optimal solution is obtained using mathematically stringent optimization methods (the Method of Moving Asymptotes, MMA) coupled with finite element analysis, interactive graphic pre- and post-processing and parametric modelling, as implemented in OASIS-ALADDIN. This approach has been applied to the optimal design of the hull structure of a Surface Effect Ship made of GRP-sandwich. The objective was to minimize the weight of the ship by determining the optimum skin and core thicknesses of structural members of the hull as well as web...
Tipo: Text Palavras-chave: Finite element method; Glass reinforced plastics; Ship hulls; Safety devices; Ship technology; Ship design; Composite materials; Sandwich; Composite; Problème inverse; Sensibilité; Optimisation.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1054.pdf
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Le comportement en fluage, en fatigue et la tenue au feu de composites sandwichs ArchiMer
Chevalier, J.
Baltek Corp. is currently in the process of introducing 3 new products: density select material, AL-600/10 and DecoLite panels, that reduce weight and cost. Creep results on typical core materials have shown that only end-grain balsa (EGB) and 9.0 lb. Nomex honeycomb were capable of continuous operation at 160 F (71 degree C). In reverse bending fatigue studies, EGB has a fatigue limit 2-2.4 times that of the PVC foams. Finally, while EGB by itself is a ASTM E-84 Class 2 material, with the proper skins and resin system, it can easily meet Class 1 requirements.
Tipo: Text Palavras-chave: Fatigue (materials); Creep; Fire; Ship technology; Ship design; Composite materials; Feu; Nid d'abeille; PVC; Ame balsa; Sandwich; Composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1065.pdf
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Linkage disequilibrium and haplotype block structure in a composite beef cattle breed. Repositório Alice
MOKRY, F. B.; BUZANSKAS, M. E.; MUDADU, M. de A.; GROSSI, D. do A.; HIGA, R. H.; VENTURA, R. V.; LIMA, A. O. de; SARGOLZAEI, M.; MEIRELLES, S. L. C.; SCHENKEL, F. S.; SILVA, M. V. G. B.; NICIURA, S. C. M.; ALENCAR, M. M. de; MINARI, D. P.; REGITANO, L. C. de A..
Abstract. Background: The development of linkage disequilibrium (LD) maps and the characterization of haplotype block structure at the population level are useful parameters for guiding genome wide association (GWA) studies, and for understanding the nature of non-linear association between phenotypes and genes. The elucidation of haplotype block structure can reduce the information of several single nucleotide polymorphisms (SNP) into the information of a haplotype block, reducing the number of SNPs in a coherent way for consideration in GWA and genomic selection studies. Results: The maximum average LD, measured by r2 varied between 0.33 to 0.40 at a distance of < 2.5 kb, and the minimum average values of r2 varied between 0.05 to 0.07 at distances...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Beef cattle; Composite; Desequilíbrio de ligação; Genome wide association studies; Halplotype block; Linjage disequilibirium; Polimorfismo de nucleotídeo único; Beef cattle; Linkage disequilibrium; Single nucleotide polymorphism; Gado de corte.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1006604
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Logiciels pour l'analyse et la conception de structures marines en composites: Problemes et perspectives ArchiMer
Papazoglou, V.
The rational procedure for the structural design of composite marine structures, including the determination of structural loading, material characterization, design criteria and performance of strength calculations, is first presented. This is followed by a critical analysis of the problems, limitations and future perspectives of the numerical tools necessary for the performance of analytical and design oriented calculations of composite marine structures.
Tipo: Text Palavras-chave: Computers; Ship technology; Ship design; Composite materials; Structure marine; Logiciel; Analyse; Composite.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1071.pdf
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Melhoramento do gado Canchim. Repositório Alice
BARBOSA, P. F..
Este subprojeto consta de três experimentos que tem como objetivos: Avaliar a produtividade do rebanho Canchim da UEPAE/São Carlos no período de 1953 a 1976; estimar parâmetros genético em bovinos da raça Canchim; construir um índice de seleção que, após testado, possa ser utilizado pelos criadores de Canchim.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Gado de corte; Seleção; Nova raça; Beef cattle; Selection; Composite.
Ano: 1978 URL: http://www.alice.cnptia.embrapa.br/handle/doc/42114
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Morphing Hydrofoil Model Driven by Compliant Composite Structure and Cavity Pressure ArchiMer
Mohammed Arab, Fatiha; Augier, Benoit; Deniset, François; Casari, Pascal; Asrolfi, Jacques-andré.
In this work a collaborative experimental study is conducted in order to assess the effect on the hydrodynamic performanceofacompliantcompositehydrofoilcontrolled by an imposed cavity pressure. It is expected that the cavity pressure together with composite structures is suitable to control the hydrodynamic forces as well as cavitation inception and development. A new concept of morphing hydrofoil is developed by the authors and tested in the cavitation tunnel at the French Naval Academy Research Institute. The experiments are based on the measurements of hydrodynamic forces and hydrofoil deformations under various conditions of cavity pressure. Effect on cavitation inception are shortly studied too. In parallel to this experiment, a 2D numerical tool is...
Tipo: Text Palavras-chave: Smart-structure; Hydrofoil; Morphing; Compliant; Composite; Cavitation..
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00601/71292/69699.pdf
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Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure ArchiMer
Arab, Fatiha Mohammed; Augier, Benoit; Deniset, François; Casari, Pascal; Astolfi, Jacques André.
In this work, a collaborative experimental study has been conducted to assess the effect an imposed internal pressure has on the controlling the hydrodynamic performance of a compliant composite hydrofoil. It was expected that the internal pressure together with composite structures be suitable to control the hydrodynamic forces as well as cavitation inception and development. A new concept of morphing hydrofoil was developed and tested in the cavitation tunnel at the French Naval Academy Research Institute. The experiments were based on the measurements of hydrodynamic forces and hydrofoil deformations under various conditions of internal pressure. The effect on cavitation inception was studied too. In parallel to this experiment, a 2D numerical tool was...
Tipo: Text Palavras-chave: Smart-structure; Hydrofoil; Morphing; Compliant; Composite; Cavitation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00593/70494/68641.pdf
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Number of laminae on the mechanical behavior of glued laminated timber (glulam) of Toona ciliata produced with vegetable polyurethane adhesive Ciência e Agrotecnologia
Faria,Douglas Lamounier; Cruz,Thiago Moreira; Mesquita Júnior,Laércio; Duarte,Paulo Junio; Mendes,Lourival Marin; Guimarães Júnior,José Benedito.
ABSTRACT The glued laminated timber (glulam) is a composite material obtained from the bonding of wood laminae arranged with parallel fibers put together. The purpose of this paper was to evaluate the influence of the number of laminae on the mechanical behavior of glulam of Toona ciliata produced with vegetable-based polyurethane adhesive. The glulam beams were produced with lamellae in the dimensions of 6.0 x 1.5 x 120.0 cm, with 3 beams being made per treatment, which were structurally composed by 5, 7 and 9 laminae. The polyurethane adhesive based on castor oil was used, applying a grammage of 350 g m-². For the technological characterization of the wood the moisture in the dry base, bulk density, chemical characterization, compressive strength...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Composite; Wood; Bond resistance; Flexural strength.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100236
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Optimal design of stiffened composite underwater hulls ArchiMer
Messager, Tanguy; Chauchot, Pierre; Bigourdan, Benoit.
This numerical study deals with the stiffened composite underwater vessel design. The structures under investigation are laminated cylinders with rigid end-closures and inter-nal circumferential and longitudinal unidirectional composite stiffeners. Structural buckling induced by the high external hydrostatic pressure is considered as the major failure risk. An optimization design tool has been developed to obtain the reinforcement definition which maximizes the limit of stability: an analytical model of cylindrical composite shell buckling has been coupled to a genetic algorithm procedure. The numerical optimization tests carried out corroborate design tendencies validated previously by experiments.
Tipo: Text Palavras-chave: Optimization; Buckling; Stiffeners; Cylinders; Composite.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-6474.pdf
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