Engenharia de Materiais (UACSA)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2913
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APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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40 resultados
Resultados da Pesquisa
Item ESTUDO COMPARATIVO DAS PROPRIEDADES TÉRMICAS, MORFOLÓGICAS E MECÂNICAS DE PA E PLA NA IMPRESSÃO 3D(2024-11-30) Silva, Rafael Aldreem Alves da; Ghislandi, Marcos Gomes; http://lattes.cnpq.br/3409757365313853; http://lattes.cnpq.br/1915012203419619This study conducted a comprehensive characterization of the thermal, morphological, and mechanical properties of poly(lactic acid) (PLA) and polyamide (PA) filaments used in 3D printing, including their carbon fiber (CF) and glass fiber (GF) reinforced variants, as well as specialized versions for high-strength (PRO) and high-temperature (PAHT) applications. Using Differential Scanning Calorimetry (DSC), tensile tests, and Scanning Electron Microscopy (SEM), the thermal behavior, mechanical strength, and internal morphology of the filaments were investigated. The results indicate that PAHT CF15, reinforced with 15% carbon fiber, exhibits the best thermal and mechanical resistance, making it suitable for high-temperature applications. PA6 GF30, with 30% glass fiber, offers a good balance between stiffness and strength. In contrast, PLA White and PLA Pro materials are more suited for moderate- temperature applications. The analysis of different infill patterns (40% and 100%) reveals that the choice of configuration depends on cost-effectiveness, considering the specific application and desired strength. The study suggests that improvements in matrix-fiber adhesion could optimize the performance of the composites, particularly for PAHT CF15.Item PROTÓTIPO PARA REAPROVEITAMENTO DA ÁGUA REJEITADA NO PROCESSO DE DESTILAÇÃO(2025-01-30) Lopes, Vinicius Bernard Ramos; Ghislandi, Marcos Gomes; http://lattes.cnpq.br/3409757365313853; http://lattes.cnpq.br/3152723257481776Water is an indispensable natural resource for life on planet Earth. It holds immense environmental, social, and economic value, fundamental to the survival of humans and ecosystems on our planet. Proper water resource management should consider reuse as an integral component, as it not only generates savings but also helps prevent water scarcity. In Brazil, water is primarily used for crop irrigation, public supply, industrial activities, energy generation, mineral extraction, aquaculture, navigation, tourism, and recreation. This study addresses the issue of water waste during the distillation process and is dedicated to developing a system to reuse the rejected water generated during the process, aiming to generate savings and reduce waste. Comparing the two production methods, we can observe that while the usual production method uses approximately 8,580 liters (distilled + waste) of water over 12 months, the proposed production method in this study uses only 627 liters of water, as all the water rejected in the process will be reused for new distillations. The results demonstrated that, due to the significant savings generated by the proposed system compared to the current model, the project can be implemented and replicated in other university laboratories. The findings also highlighted that this water reuse system is an excellent sustainable alternative for managing water resources.Item Estudo da resistência à corrosão do revestimento a base da liga Zn-Ni obtido por eletrodeposição em aço SAE 1020(2023-09-18) Gomes, Anyelle Maria Torres; Santos, Aureliano Xavier dos; http://lattes.cnpq.br/0810494477757052; http://lattes.cnpq.br/9310446438519382Concern for the environment and environmental laws increasingly increase the desire to reduce waste disposal costs, with this in mind, a good alternative is the use of metal biodigesters. However, the organic material and the product of the biochemical process reduce the useful life of this equipment. Aiming for good durability and efficiency of this equipment, studies have been carried out to apply coatings with materials that are highly resistant to corrosion through the electrodeposition process. The objective of this study was to evaluate the corrosion resistance of coatings based on the Zn-Ni alloy obtained by electrodeposition on SAE 1020 steel sheet. The process parameters, bath temperature and current density used to obtain coatings with the alloy Zn-Ni were optimized using factorial experimental design and the results analyzed by the Response Surface Methodology (MSR). The Ni-Zn alloy coatings were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical corrosion measurements by Linear Potentiodynamic Polarization (PPL) and Electrochemical Impedance Spectrometry (EIE). The coating with the alloy Zn68.9Ni31.1 at.%, deposited with current density 25 A/cm2 and bath temperature 60oC, presented the best results against corrosion, as it presented the lowest values of corrosion current, thus indicating a less dissolution of the coating.Item Gesso de revestimento destinado à construção civil reforçado com nanopartículas de óxido de grafeno: análise da resistência mecânica(2024-03-01) Firmino, Daniel Ardiles; Ghislandi, Marcos Gomes; http://lattes.cnpq.br/3409757365313853; http://lattes.cnpq.br/3378137503705619Plaster is a widely used material in civil construction, employed for both structures and general coatings. Graphene Oxide, known for reinforcing structures and being utilized as a reinforcement in civil engineering, is expected to provide additional strength to the structure when incorporated into plaster. This study focused on reinforcing plaster coating with graphene oxide at a concentration of 0.01% by mass, aiming to optimize mass and examine its mechanical properties. A comparison was made between samples with and without oxide addition. The graphene oxide was obtained through the modified Hummers method. Two characterization techniques, X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), were employed for morphological and structural analysis. Sample preparation adhered to parameters outlined in the NBR 12128 (ABNT, 2019) and NBR 12129 (ABNT, 2017) standards. The results revealed that plaster with added graphene oxide exhibited a reduction of over half in compressive strength compared to plaster without the additional load. SEM images highlighted the accumulation of graphene oxide in specific regions of the plaster, potentially contributing to this decrease in strength.Item Plano de gerenciamento de materiais de reposição para mitigação de falhas no processo de resfriamento em linhas produtivas de uma aciaria(2024-10-04) Gusmão, Maria Clara Carvalho; Araújo, Ana Cláudia Vaz de; http://lattes.cnpq.br/6861890992609511; http://lattes.cnpq.br/9542072301264041Cooling in the continuous casting process is essential for the solidification of liquid steel in a controlled manner. Failures in cooling pumps can interrupt the flow of water, resulting in inadequate cooling and increasing the downtime of a melt shop. The availability of suitable replacement materials for the water pumps is fundamental to maintaining the efficiency of the production lines. In this study, a spare materials management plan was implemented for cooling pumps in a steel mill, with the aim of reducing recurring failures. To analyze the causes of these failures, methodologies such as the Ishikawa Diagram and the 5 Whys Method were applied, which enabled critical factors to be identified, including the use of inappropriate materials. Based on this information, a materials management plan was drawn up, which included the creation of a detailed inventory with the technical specifications of the components, theclassification of replacement items by criticality, the implementation of maintenance plans and regular audits to monitor the effectiveness of the system. The results showed a significant reduction in machine downtime, from 878 minutes to 123 minutes over the 6-month period, representing a decrease of approximately 85.9%. These results reinforce the importance of effective materials management and the correct availability of spare parts for maintaining operational efficiency, highlighting the importance of proactive maintenance practices and strict quality control of materials.Item Efeito dos parâmetros de soldagem em revestimentos a base de níquel nas medidas eletroquímicas de corrosão(2024-09-30) Santos, Paulo Vinícius Lima dos; Santos, Aureliano Xavier dos; http://lattes.cnpq.br/0810494477757052; https://lattes.cnpq.br/7584847021954297Metallic materials are widely used in industry, including API 5L X70 steel, used for oil transportation. However, these steels are susceptible to corrosion due to the aggressive environment. As a result, various studies have been carried out to mitigate the effect of corrosion. Solid wire welding processes are used to weld coatings for this purpose, but they require information from the user to determine the most suitable welding conditions. The aim of this work was to study the influence of welding parameters for Inconel 625-based coatings on electrochemical corrosion measurements. To optimize the experiments, a full factorial design was used to evaluate the welding parameters, welding speed and feed rate. After welding, the samples were cross-sectioned and dilution calculations and iron content measurements were made by EDX. Finally, to reveal the corrosion resistance, the electrochemical technique by linearpotentiodynamic polarization was used, through polarization resistance, corrosion potential, corrosion current.Item Adsorção do preto reativo 5 a partir das cinzas do bagaço da cana-de-açúcar(2024-08-02) Souza, Ellen Cristovão de; Freitas, Jucleiton José Rufino de; http://lattes.cnpq.br/5437959745507297; http://lattes.cnpq.br/5321037256511207Water is essential for humanity, but in the Brazilian Northeast there is a serious socio- environmental problem due to poor distribution and low water availability, aggravated by the expansion of agribusiness and contamination of water sources. Industrial pollution is a major problem, especially in the textile sector, which uses toxic dyes that are difficult to remove, such as Reactive Black 5 (RB5), widely used in the textile industry, is a toxic, mutagenic and carcinogenic dye. To mitigate the damage, nanotechnology, which manipulates materials on a nanometric scale, offers promising solutions. Adsorption is an efficient method for treating effluents, standing out for its ease and simplicity. Among adsorbents, such as zeolites, minerals with high adsorption capacity, are promising for removing contaminants. The study focuses on the synthesis of zeolites from sugarcane bagasse ash, supplied by the Olho D’Água plant (Camutanga-PE). The ash was prepared, dried and characterized, and the silica was extracted by thermal and chemical methods. The synthesized zeolites were tested for adsorption of the RB5 dye, demonstrating high efficiency in dye removal in adsorption tests with different masses and interaction times. The adsorption process proved to be effective and economical for the treatment of water contaminated by textile dyes, with positive results when using chemically treated ash. New tests indicated that, even with less ash, the decolorization efficiency was high. Adsorption, therefore, represents a viable and low-cost solution for the remediation of contaminated water.Item Avaliação do uso de politereftalato de etileno (PET) pós consumo na indústria de embalagens alimentícias(2021-07-15) Silva, Bárbara Stefany Lima Da; Andrade, Daniela de Lourdes Anjos Coutinho Simões; http://lattes.cnpq.br/8149955436222196; http://lattes.cnpq.br/0185643398779242The environmental appeals and the high percentage of Poly (Ethylene Terephthalate) - PET waste, discarded in nature, often inappropriately, drive the packaging market to seekalternatives for the use of post-consumer recycled PET (PET-PCR). In order to assist in this purpose, this work evaluated the feasibility of using 100% recycled PET as a raw material in the production of food packaging. For this purpose, PET-PCR was injected ina two-stage Husky injection molding machine with a 48-cavity mold. The results were compared with those of virgin PET (PET-V), a raw material already used, in order to evaluate the influence of the resin type used on the quality and viability of the preform for application in the packaging sector. The green coloring additive was added in both formulations, with 0.04% and 0.07%, by mass for PET-V and PET-PCR, respectively, to guarantee the color required in some types of carbonated beverages. According to the results obtained, the parameters established for the PET-PCR forming process did not cause injection defects or great divergences in relation to PET-V. Through intrinsic viscosity analysis, visual inspection, colorimetry and differential scanning calorimetry (DSC), it was noticed that PET-PCR is more susceptible to degradative hydrolytic fissionreactions, as expected, since it is a resin which has a thermal history, but these reactions do not make its use unfeasible in food packaging. The gas chromatography results show that the injection process used for PET-V provided higher acetaldehyde contents, this result was attributed to the more aggressive conditions during the extrusion step and, finally, the specific migration test showed that the PET- PCR is within the limits applicable according to the Brazilian Legislation for Carbonated Drinks (ANVISA - Technical Information No. 71 of February 11, 2016). Thus, PET-PCR can be used in theproduction of food packaging since the deviations found are purely esthetic and do not interfere with its quality and applicability.Item Influência dos parâmetros de tratamento térmico na resistência à corrosão de vergalhões CA-50(2024-09-17) Barros, Thiago Henrique Lima Pereira de; Santos, Aureliano Xavier dos; http://lattes.cnpq.br/0810494477757052; https://lattes.cnpq.br/2859967617130303The CA-50 carbon steel rebar is an essential component in civil construction, ensuring the resistance and durability of reinforced concrete structures. The corrosion of rebar in reinforced concrete is one of the most critical pathologies, as it compromises structural integrity, reduces the lifespan of buildings, and generates significant maintenance costs. This study aims to evaluate the effects of heat treatment parameters on the corrosion resistance and microstructure of CA-50 rebar. The influence of parameters, including heating rate, holding temperature, and holding time, was analyzed using a three-level factorial experimental design. Corrosion resistance was assessed through linear potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The results indicated that both holding time and heating rate significantly affect the corrosion potential, while the corrosion current showed no relevant variations concerning the studied parameters. It was observed that holding time had a significant impact on polarization resistance, whereas holding temperature did not exert a direct influence on any of the response variables. Additionally, both increases and decreases in corrosion resistance were observed based on the microstructures formed after heat treatment. Thus, optimizing the heat treatment parameters can enhance the corrosion resistance of CA-50 rebar, due to the direct relationship with grain size and resulting microstructural characteristics.Item Aplicações de simulações computacionais para melhorias e redução de custos no processo de injeção de termoplásticos(2021-07-14) Ribeiro, Rayanne do Nascimento Guerra Melo; Figueiredo, José Fernando DagnoneThe present project is intended to study the importance using computer simulations with the Inventor Moldflow 2019 software to study the main defects and the possibility of cost reduction in the thermoplastic injection process as a benefit of using industry 4.0 concepts. For this, thermoplastics High Density Polyethylene (HDPE or HDPE) and Polypropylene (PP) were studied to simulate the injection process of the plastic component of the domestic orange juice cone. The results induced that the injection parameters are influenced by the morphological properties of the polymers, with the crystallinity being directly induced in the contraction and injection pressure of thermoplastics. So, it was possible to show the potential of computer simulations as a tool for cost reduction in the thermoplastic injection process.