http://repositorio.ufgd.edu.br/jspui/handle/prefix/4195 Fri, 16 Jan 2026 01:56:19 GMT 2026-01-16T01:56:19Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6767 Título: Construção de revestimentos modificadores de superfície por processo de soldagem a arco elétrico com eletrodo revestido (SMAW) Autor(es): Bernal , Pâmela Brandão; Silva, Rodrigo Josiel da Primeiro Orientador: Pollnow, Edilson Nunes Abstract: This work investigated the surface modification of A36 steel by SMAW welding using fluxes enriched with boron and ferro-niobium carbide (Fe-NbC) in dry and wet routes, focusing on the improvement of properties related to microhardness. The methodology involved visual inspection, macroscopic analysis to determine the dilution rate, microstructural characterization of the fusion zone, heat-affected zone, and base metal, as well as Vickers microhardness tests. The results showed sound weld beads and dilution rates with discrete variations, presenting a tendency for dilution rate reduction with boron and a slight increase with Fe-NbC, with greater stability in dry welding. The microstructures revealed that Fe-NbC favored the formation of dendritic columns and NbC carbides, while boron promoted B₄C carbides and microstructural refinement, with agglomeration at higher concentrations. Microhardness showed moderate variations, with boron being the most effective agent in hardening, approaching the values of the reference sample. The HAZ maintained uniform behavior, and the base metal preserved its original microstructure. It was concluded that boron stood out as the element with the greatest impact on the final performance of the coatings, both by reducing dilution and increasing hardness. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Tue, 09 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6767 2025-12-09T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6754 Título: Design, construction, and testing of alow-cost aerodynamic force measurement system for a subsonic wind tunnel Autor(es): Silva , Dionnatan Gabriel Retamero da Primeiro Orientador: Bornschlegell , Augusto Salomão Abstract: This work presents the design, construction, and experimental assessment of a low-cost external aerodynamic force measurement system for a subsonic wind tunnel. Aiming to overcome the prohibitive costs of commercial instrumentation in engineering education, the project developed a customized solution prioritizing structural integrity and maintenance feasibility. The construc tion methodology adopted a rigid welded steel architecture to minimize mechanical deflection and hysteresis, integrated with modular bending beam load cells to allow for sensor scalabi lity. The system characterization comprised static calibration, which confirmed high linearity (𝑅2 ≈ 1.0)andstable zero offsets, followed by aerodynamic testing using cylinders and a NACA 0012 airfoil. Results established a reliable operational envelope for freestream velocities excee ding 10 m/s, where the signal-to-noise ratio becomes optimal. A comparative analysis between 25 mm and 100 mm cylinders demonstrated the critical impact of wall confinement: the larger model exhibited overestimated drag coefficients due to a 21.6% blockage ratio, while the 25mm specimen yielded results consistent with subcritical literature (𝐶𝐷 ≈ 1.18). Furthermore, the system successfully resolved finite wing effects on the airfoil, capturing the induced drag penalty. It is concluded that the proposed architecture provides a robust, modular platform for educational and applied research, provided that geometric boundary conditions are respected. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Mon, 15 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6754 2025-12-15T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6740 Título: Experimental aerodynamic analysis of a formula-style multi-element front wing Autor(es): Pretto, Thales Rodrigues Primeiro Orientador: Bornschlegell, Augusto Salomão Abstract: This work investigates the aerodynamic forces on a Formula 1-inspired multielement front wing operating within the Low Reynolds Number regime. Through an experimental approach using a scale prototype produced via additive manufacturing and tested in a wind tunnel with a rolling road, the study explores the intricate interplay between ground effect, angle of attack, and flow velocity. Central to this analysis is the "Cascade Effect," a critical mechanism for high-lift generation, whose efficacy is rigorously examined under varying conditions. The results unveil a non-linear landscape of aerodynamic performance, challenging classical assumptions regarding ground proximity and revealing the susceptibility of high-camber profiles to abrupt stall phenomena when the cascade mechanism falters. Ultimately, this research highlights the delicate equilibrium required to maximize aerodynamic efficiency (lift-drag ratio), demonstrating that best operating point is achieved not through the maximization of individual parameters, but through the precise tuning of geometric and flow constraints.; Este trabajo investiga las fuerzas aerodinámicas sobre un alerón delantero multielemento inspirado en la Fórmula 1, operando dentro del régimen de Bajo Número de Reynolds. A través de un enfoque experimental utilizando un prototipo a escala producido mediante fabricación aditiva y probado en un túnel de viento con tapiz rodante (cinta rodante), el estudio explora la compleja interacción entre el efecto suelo, el ángulo de ataque y la velocidad del flujo. Central en este análisis es el "Efecto Cascada", un mecanismo crítico para la generación de alta sustentación, cuya eficacia es rigurosamente examinada bajo condiciones variables. Los resultados revelan un panorama no lineal del rendimiento aerodinámico, desafiando suposiciones clásicas sobre la proximidad al suelo y revelando la susceptibilidad de los perfiles de alta curvatura a fenómenos de estol abrupto cuando falla el mecanismo de cascada. Finalmente, esta investigación destaca el delicado equilibrio requerido para maximizar la eficiencia aerodinámica (relación sustentación-resistencia), demostrando que el mejor punto de operación no se logra mediante la maximización de parámetros individuales, sino a través del ajuste preciso de las restricciones geométricas y de flujo. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Wed, 03 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6740 2025-12-03T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/5770 Título: Análise estrutural de uma unidade portátil offshore por meio da modelagem não linear dos cabos de içamento Autor(es): Lopes, Rodrigo Baldonado Primeiro Orientador: Bornschlegell, Augusto Salomão Abstract: The main operation in industrial enviroment is transportation, that is, the displacement of materials from and to the industrial plants as well as the displacement of materials inside of the plant. Normally the loads envolved are above of the human physical capacity, then lifting and transportation machinery is necessary. This machinery may work in onshore, offhore and subsea conditions. In this article, it was performed the structural analysis of the lifting of a portable unit of 1 cubic meter in offshore conditions, using the Finite Element Analysis (FEA). The geometrical discretization was performed using shell elements and the equations discretizations was performed using the Discrete Kirchhoff Theory (DKT). The model was constructed using the software Salome Meca considering the nonlienarity from the cables. It was obtained the maximum admissible load for the estructure, according to DNV 2.7-3. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Thu, 28 Sep 2023 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/5770 2023-09-28T00:00:00Z