Artigos
URI permanente para esta coleçãohttps://rigalileo.itegam.org.br/handle/123456789/219
Artigos produzidos de convênios e parcerias com IES
Navegar
9 resultados
Resultados da Pesquisa
Item Matrix polyester composite strengthened by munguba fiber (Pseudobombax munguba) Amazon(INSTITUTO DE TECNOLOGIA, 2015) LOPES, Raimundo V. P.; LEITE, Jandecy C.; FUJIYAMA, Roberto Tetsuo; AFONSO, Marcus R. B.; HERMENEGILDO, Eleodoro R.; MAGALHÃES, Edilson MarquesThe diversity of Amazon flora supports the development of new polymeric composites. This article evaluates the mechanical properties of polyester composites reinforced with short and continuous munguba fibers (Pseudobombax munguba). Tensile tests were conducted for fibers of different lengths (5, 10, and 15 mm) and continuous aligned fibers. Results indicated increased tensile strength with fiber length and superior mechanical performance with aligned continuous fibers.Item Materiais compósitos de matriz poliéster reforçados com resíduos de madeira de diferentes morfologias(INSTITUTO DE TECNOLOGIA, 2013) LOPES, Carlos Eduardo Pinto; PEREIRA, Léo César de Oliveira; COSTA, Deibson Silva da; LOPES, Raimundo Valdan Pereira; PINTO, Vagner Barroso; LEITE, Jandecy Cabral; FUJIYAMA, Roberto Tetsuo; MAGALHÃES, Edilson MarquesThis study presents the production and characterization of polyester matrix composites reinforced with residues from the Amazon timber industry. Using Angelim Pedra wood powder in different particle sizes and weight fractions (6.86% and 10.86%), the composites were evaluated for their mechanical properties through tensile tests. The results showed that smaller particles increase tensile strength, indicating that the reuse of these residues is viable and contributes to industrial sustainability.Item Material Compósito de Matriz Polimérica Reforçada com Fibras Vegetais de Curauá e Sisal(INSTITUTO DE TECNOLOGIA, 2013) SANTOS, Eduardo de Jesus Silva dos; TAKAHASHI, Rafael; COSTA, Deibson Silva da; LOPES, Raimundo Valdan Pereira; PINTO, Vagner Barroso; LEITE, Jandecy Cabral; FUJIYAMA, Roberto Tetsuo; MAGALHÃES, Edilson MarquesThis study evaluated the manufacturing process of polymer matrix composites reinforced with natural curauá and sisal fibers, focusing on a fiber length of 25 mm. The methodology involved producing prepregs by spraying polyester resin diluted in styrene and manual lamination followed by compression molding. Specimens were tested according to ASTM D3039, showing that the curauá fiber composite exhibited higher tensile strength (average of 680.72 N) compared to sisal (431.53 N). The results confirmed the feasibility of the process and the influence of fiber type and length on the mechanical properties of the material.Item Estudo da Influência da Umidade e Salinidade em Material Compósito de Matriz Polimérica(INSTITUTO DE TECNOLOGIA, 2013) SANTOS, Eduardo de Jesus Silva dos; TAKAHASHI, Rafael; COSTA, Delbson Silva da; LOPES, Raimundo Valdan Pereira; PINTO, Vagner Barroso; LEITE, Jandecy Cabral; FUJIYAMA, Roberto Tetsuo; Prof. Dr. Carlos Tavares da Costa JúniorThis study examines the mechanical properties of polyester matrix composites reinforced with macaranduba wood powder and the effects of exposure to adverse environmental conditions, such as humidity and salinity. The results indicate that aging in water and saline water significantly reduces the impact resistance of the material due to degradation at the matrix-reinforcement interface.Item Efeito da transformação da microestrutura do aço ao carbono obtido por processos termoquímico a gás(INSTITUTO DE TECNOLOGIA, 2010) MONTEIRO, Alberto de Castro; SILVA, José Antonio de Souza; OLIVEIRA, Macêdo Santos de; DELON, José Alain; LEITE, Jandecy Cabral; MAGALHÃES, Edilson MarquesThe study examined the microstructural transformation of SAE 1020 steel (low carbon) subjected to gaseous carbonitriding thermochemical treatment to enhance wear resistance in helical broaches for pocket lighters. Nitrided and carburized layers were analyzed via optical microscopy and microhardness tests, comparing approved and non-conforming samples. Results showed that ferric nitride presence significantly increased surface hardness, with diffusion layers of 0.14 µm to 0.47 µm (nitrides) and 1.43 µm to 2.76 µm (carbides), complying with NBR NM 136 standards. The process proved effective for applications requiring ductile cores and wear-resistant surfaces.Item Lei de Crescimento em Função da Posição para Ligas do Sistema Monotético(INSTITUTO DE TECNOLOGIA, 2014) BRAGA, José F. A.; SILVA, Cássio A. P.; SPINELLI, José E.; GARCIA, Amauri; SILVA, Adrina P.; Professora Dra. Fernanda Souza do NascimentoThis paper investigates the evolution of interphase spacing (λ) in monotectic alloys of the Al-Bi, Al-Pb, and Al-In systems during unsteady-state directional solidification. A new growth law specific to monotectic systems was proposed, expressed as λ = k.(P)⁰.⁵, where k is a constant and P is the position from the metal/mold interface. The results demonstrated that the proposed law is valid for different heat extraction configurations (upward and downward), with coefficients of determination (R²) ranging from moderate to strong. The study enhances the understanding of the microstructure of these alloys, which are promising for wear-resistant automotive components.Item Microestrutura e dureza após têmpera por indução eletromagnética aplicada em virabrequim de motocicleta(INSTITUTO DE TECNOLOGIA, 2014) TENÓRIO, Jovanio G.; VASCONCELOS, Angela J.; MAGNO, Igor B.; SOARES, Evaldo F.; ROCHA, Otávio L.; Jandecy Cabral LeiteThis paper investigates the application of electromagnetic induction hardening on motorcycle crankshafts using a straight inductor device. Metallographic tests, hardness testing (HRC), optical microscopy, and X-ray diffraction were conducted. The results show a hardening depth of up to 1.5 mm and surface hardness reaching 58 HRC. The microstructure includes tempered martensite and fine carbides dispersed in a refined ferrite-rich matrix. The heat treatment proved effective according to the motorcycle manufacturer's standards.Item Biocomposite from polyester reinforced with licuri leaves fiber (Syagrus coronata)(INSTITUTO DE TECNOLOGIA, 2015) SANTOS, Manfrine Silva; LOPES, Raimundo Valdan Pereira; LEITE, Jandecy Cabral; AFONSO, Marcus Roberto Binda; HERMENEGILDO, Eleodoro Rodriguez; MAGALHÃES, Edilson MarquesThe aim of this paper is the evaluation of the mechanical properties of polyester composites reinforced with Licuri fibers by tensile testing using a manual process with minimal technological steps to obtain a technically viable material. Fibers were characterized by mass fraction and surface morphology via scanning electron microscopy. Results showed that tensile strength increased with fiber length, indicating potential viability despite the relatively low mass fractions compared to other studies.Item Avaliação da Variação das Frações Mássicas das Fibras nas Propriedades Mecânicas do Compósito Poliéster Reforçado por Fibras de Sisal(Instituto de Tecnologia, 2013) EL BANNA, Wassim R.; COSTA, Delbson S. da; GILDO, Camila C. R.; LOPES, Raimundo Valdan P.; PINTO, Wagner B.; LEITE, Jandecy Cabral; FUJIYAMA, Roberto T.; QUARESMA, João Nazareno NonatoThe study evaluated the influence of sisal fiber mass fractions (1.41% to 9.41%) on the mechanical properties of polyester matrix composites. Specimens were fabricated by manual molding and subjected to tensile tests according to ASTM D 638. Results showed that the 5.41% mass fraction achieved the highest tensile strength (22.23 MPa), outperforming other natural fibers. Beyond this fraction, strength decreased due to fiber-matrix interface saturation. The manufacturing method proved viable for producing sustainable and low-cost materials.