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Numerical and experimental analyses of biocomposites reinforced with natural fi...
Silva, Leandro J.; Panzera, Túlio Hallak; Christoforo, André Luis; Durão, Luís M.; Lahr, Francisco Antonio Roccon the last decades the biocomposites have been widely used in the construction, automobile and aerospace industries. Not only the interface transition zone (ITZ) but also the heterogeneity of natural fibres affects the mechanical behaviour of these composites. This work focuses on the numerical and experimental analyses of a polymeric composite fabricated with epoxy resin and unidirectional sisal and banana fib...
Remarks on orthotropic elastic models applied to wood
Mascia,Nilson Tadeu; Lahr,Francisco Antônio RoccoWood is generally considered an anisotropic material. In terms of engineering elastic models, wood is usually treated as an orthotropic material. This paper presents an analysis of two principal anisotropic elastic models that are usually applied to wood. The first one, the linear orthotropic model, where the material axes L (Longitudinal), R( radial) and T(tangential) are coincident with the Cartesian axes (x,...
Relation between the compaction rate and physical and mechanical properties of ...
Dias,Fabricio Moura; Nascimento,Maria Fátima do; Martinez-Espinosa,Mariano; Lahr,Francisco Antonio Rocco; Valarelli,Ivaldo de DomenicoThe compaction rate, the relation between the density of the wood panel and the density of the wood used for producing the particles, is an indicator of the product's densification. Among the various types of wood panels, particleboards are widely employed in the lumber industry, mainly for the furniture production. This paper presents a study of the relation between the compaction rate and the properties of te...
Wood-polymer composite: physical and mechanical properties of some wood species...
Stolf,Denise Ortigosa; Lahr,Francisco Antonio RoccoThis study aimed to demonstrate the feasibility of obtaining wood-polymer composites (WPC) displaying a performance superior to that of untreated wood from reforested genera. To this end, wood samples of Pine (Pinus caribaea) and Eucalyptus (Eucalyptus grandis), whose density is compatible with this process, were impregnated with the polymeric monomers styrene and methyl methacrylate, using benzoyl peroxide to ...
Alternative castor oil-based polyurethane adhesive used in the production of pl...
Dias,Fabricio Moura; Lahr,Francisco Antonio RoccoPlywood is normally produced with urea-formaldehyde and/or phenol-formaldehyde adhesives. However, the former is considerably toxic and environmentally damaging, while the latter is expensive, thus motivating the search for alternative raw materials in plywood production. The castor oil-based polyurethane adhesive developed at the São Carlos Institute of Chemistry, University of São Paulo, is an environmentally...
Production and characterization of MDF using eucalyptus fibers and castor oil-b...
Campos,Cristiane Inácio de; Lahr,Francisco Antonio RoccoThe growing popularity of wooden panels renders this market segment increasingly competitive. MDF (Medium Density Fiberboard), in particular, is widely employed for a variety of applications, including civil construction, furniture, and packaging. This paper discusses a study of MDF produced from alternative raw materials, i.e., Eucalyptus fibers and castor-oil-based polyurethane resin. Physical and mechanical ...
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