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dc.contributor.authorHarter, Fabiane Valentept_BR
dc.contributor.authorSouza, Jeferson Ávilapt_BR
dc.contributor.authorIsoldi, Liércio Andrépt_BR
dc.contributor.authorSantos, Elizaldo Domingues dospt_BR
dc.contributor.authorAmico, Sandro Campospt_BR
dc.date.accessioned2018-02-24T02:26:36Zpt_BR
dc.date.issued2017pt_BR
dc.identifier.issn1517-7076pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/172855pt_BR
dc.description.abstractResin Transfer Molding (RTM) process is commonly used to produce high quality polymeric composites with simple or complex geometries in small to large sizes. In RTM process a preformed reinforcement is positioned inside the mold cavity. This dry reinforcement is actually a fibrous porous media whereby resin will flow. The mold is then closed and resin is injected. After complete impregnation of the reinforcement, resin cure process takes place. Numerical simulation is a very useful tool for mold design and process optimization, however resin and reinforced medium physical properties must be precisely determined. Medium permeability is probably the most important and most difficult parameter to be evaluated. In this work it is proposed a numerical/experimental methodology to determine transverse permeability in reinforcements used within RTM process. PAM–RTM software was chosen to simulate resin flow through the reinforced medium. Proposed methodology uses the inverse parameter estimation method to calculate the unknown permeability. Newton-Raphson method was used to solve the associated algebraic equation system, on which PAM–RTM software is used to calculate resin injection times. Results have shown that with previous knowledge (taken from literature or obtained experimentally) of the in-plane permeabilities (Kxx and Kyy), physical properties of the resin (ρ, μ), medium porosity (ε) and total filling time (t) it is possible to estimate transverse permeability in thick pieces. It was also performed a numerical study about the influence of transverse permeability in resin flow inside the mold. This study predicted several possible problems that may occur when transverse permeability is much smaller than in-plane permeabilities. Finally, it is possible to state that mold design and proper fibrous reinforcement choice can be optimized when numerical techniques are used.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofRevista matéria [recurso eletrônico]. Rio de Janeiro, RJ. Vol. 22, n. 2 (2017), artigo e-11851, [12 p.]pt_BR
dc.rightsOpen Accessen
dc.subjectMoldagem por transferência de resinapt_BR
dc.subjectTransverse permeabilityen
dc.subjectSimulação numéricapt_BR
dc.subjectAnisotropic mediumen
dc.subjectRTMen
dc.subjectPAM-RTMen
dc.titleTransverse permeability determination and influence in resin flow through an orthotropic medium in the RTM processpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001059875pt_BR
dc.type.originNacionalpt_BR


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