Gilmar Cordeiro da Silva

Scopus Publications

Mechanical and Structural Behavior of AISI 441 Steel after a Deep Drawing Operation
M. M. C. Neto, G. C. Silva, M. Matějka, E. C. S. Corrêa, W. Lopes
Journal of Materials Engineering and Performance, 2026
Influence of ECAP on the CuCrNiSi alloy: from microstructural refinement to spot welding electrode applications
Victor Souza Esteves Lima, Gilmar Cordeiro Silva
International Journal of Advanced Manufacturing Technology, 2025
Analysis of residual stress in helical gear teeth involute profile and helix in hobbing, shaving, carbonitriding, quenching and tempering processes
Carlos Alberto de Sousa Neves, José Rubens Gonçalves Carneiro, Gilmar Cordeiro da Silva, Paulo Sérgio Martins, Elhadji Cheikh Talibouya Ba, Pedro Miraglia Firpe, Anderson Silva José, Leandro da Silva Braga, Daniel Moreira Miranda
Forschung Im Ingenieurwesen Engineering Research, 2025
Development of Two-Wrinkled Tubes Using an Electrostatic Structural Analysis
Samara C. R. Soares, Gilmar C. Silva, Elza M. M. Fonseca
Applied Sciences Switzerland, 2025
The primary aim of this study is to develop an axisymmetric numerical model, employing the finite element approach, to simulate a two-wrinkling tube in T6 aluminum. The method uses an electric potential applied to the tube mesh, which passes through a solid die to induce the wrinkling process, facilitated by contact elements between the tube and the die. A lateral incremental voltage electric potential (0–50 kV), due to an electric coil, and applied axial and compressive displacement (0–12 mm) was considered. The materials’ properties were established as nonlinear, with elastoplastic behavior. The results were analyzed, which allowed the tube deformation with two wrinkles, comparable with previous results.
Hardness profile of AISI 444 steel after a stamping operation
João Marcos do Carmo Antunes, Gilmar Cordeiro Silva, Victor Souza Esteves Lima, Elaine Carballo Siqueira Corrêa, Wellington Lopes
Revista Materia, 2025
RESUMO A caracterização mecânica e microestrutural de produtos estampados é essencial para a identificação de defeitos e orientar a melhoria das propriedades, ampliando a gama de aplicações para diferentes tipos de materiais. Nesse contexto, o estudo da relação entre as propriedades mecânicas e o respectivo arranjo microestrutural assumidos por um material após uma operação de estampagem é um método útil para o controle de qualidade, assim como para avaliar a ocorrência de falhas como o desenvolvimento de uma orientação cristalográfica inadequada e a identificação de regiões que sofreram um estado de tensões e deformação plástica que podem ocasionar problemas como o afinamento da espessura da chapa. Este trabalho executa a caracterização mecânica de um copo estampado com uso do aço inoxidável ferrítico AISI 444 por meio da operação de embutimento com a descrição do perfil de dureza Vickers em diferentes posições, combinada com a apresentação do respectivo aspecto microestrutural nessas mesmas posições da caracterização mecânica. Considerando que a operação de estampagem foi realizada a frio, a análise microestrutural indicou reduzida orientação dos grãos, mesmo nas regiões que sofreram maior quantidade de deformação plástica e encruamento, e consequentemente, maior dureza Vickers. Observou-se ainda que a variabilidade da dureza em função doo posição do copo estampado foi maior que a detectada para o aspecto microestrutural.
Computational Methodology for the Development of Wrinkled Tubes by Plastic Deformation
Samara C. R. Soares, Gilmar C. Silva, Elza M. M. Fonseca
Applied Sciences Switzerland, 2024
Traditional methods for wrinkled tubes involve welding processes and additional elements, such as plates, screws, rivets, and guides. Considering all the limitations of these processes, this work aims to propose a methodology that allows for maximising the manufacturing process of carbon steel tube joints with seaming using cold forming and minimising the cost of the final product. Therefore, the present work aims to develop a computational model, based on the finite element method, to optimise the deformation process of T6 Aluminium tubes (ø 45 × ø 38.6 mm) with a length of 120 mm. The method uses a steel die with cavities to achieve wrinkled tubes by a forming process. This numerical study was carried out using the Ansys® 2022 R2 software. A nonlinear material and an incremental structural analysis were used. The applied methodology allowed the optimisation of process parameters, the application of forces during tube deformation, the geometry of the die cavity, boundary conditions, and mesh discretisation. Numerical modelling was carried out using the axial symmetry of the assembly (tube–die), enabling a simplified and efficient execution of the final tube geometry. The results were analysed based on the maximum pressure applied to the tube, and the vertical and horizontal displacements of the deformed component, thus obtaining the tube flow with complete filling inside the die cavity at the end of deformation. The die geometry that produced the best results presented a cavity with a radius of curvature of 3 mm, 6 mm in height, and with a depth of 4 mm. The optimised result of the die geometry generated satisfactory results, with the displacement on the x-axis of the tube of approximately 2.85 mm, ensuring the filling of the cavity at the end of the process. For this, the maximum pressure exerted on the tube was approximately 374 MPa.
Friction surfaced coatings obtained by vertical feed-rate controlled deposition exhibit stable electrochemical behavior as a function of rotation speed during deposition
Diego Fonseca Silva, Gilmar Cordeiro da Silva, Pedro Brito
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2024
Preventive measures for progressive tool failure using load cell-based signal monitoring
Edipo Santos Amaral, Gilmar Cordeiro Silva
Measurement Journal of the International Measurement Confederation, 2024
Analyzing micro-geometric deviations of a helical gear profile as a function of material and machining parameters in the hobbing, shaving and carbonitriding processes
Carlos Alberto de Sousa Neves, José Rubens Gonçalves Carneiro, Gilmar Cordeiro da Silva, Paulo Sérgio Martins, Elhadji Cheikh Talibouya Ba, Gustavo Henrique Nazareno Fernandes
International Journal of Advanced Manufacturing Technology, 2023
Characterization of Iron Aluminide Diffusion Coatings Obtained after Friction Surfacing
Norberto Martins, Ana Paula Silva, Gilmar Cordeiro da Silva, Ítalo Bruno dos Santos, Carlos Eduardo dos Santos, Fernanda Troysi, Pedro Brito
Metals, 2023
Iron aluminides are considered as candidate materials for high temperature applications for their excellent high temperature corrosion and oxidation resistance. In the present work, iron-aluminide coatings were developed by friction surfacing (6351 aluminum alloy deposited on a low-carbon steel substrate) followed by a diffusion heat treatment. The initial coatings were found to be geometrically homogenous and adhered well to the steel substrate. The heat treatment process was carried out at 550 °C for 48, 72 and 96 h and the resulting coatings were characterized in terms of microstructure, chemical composition, hardness distribution and phase composition. After heat treatment, the coating/substrate interface morphology was modified and presented patterns typical of Fe-Al intermetallic formation, as well as a substantial increase in hardness (>900 HV) relative to the initial as-deposited condition. With the diffusion treatment, initially Fe2Al5 was found to develop in the coatings, which was converted into FeAl2 after longer exposures.
Numerical and experimental analysis of SAE 1010 thin steel sheets formability with and without galvanizing (GI-85)
Izabella Luiza Santos Almeida, Gilmar Cordeiro da Silva, Tarcísio José de Almeida, Breno Pimenta Pires
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2023
Evaluation of the effect of surface modification of Ti64 and 316 L by addition of calcium phosphate through electrical discharge machining process
Aderci Freitas Filho, Gilmar Cordeiro Silva, Samara Christina Soares Rodrigues, Anderson Júnior Santos
Tribology International, 2023
Study of wear behavior and tool life in different taps during the internal threading of a nodular iron engine crankshaft
Paulo Sérgio Martins, Josué Olímpio dos Santos, José Rubens Gonçalves Carneiro, Gilmar Cordeiro da Silva, Cádmo Augusto Rodrigues Dias, Vitor Ferreira Vieira, Gustavo Henrique Nazareno Fernandes, Elhadji Cheikh Talibouya Ba
International Journal of Advanced Manufacturing Technology, 2022
Evaluation of surface roughness in the incremental forming process with variation in the degrees of freedom of the contact tool
Gilmar Cordeiro da Silva, Lucas Moraes Rufini de Souza, Lucio Flávio Santos Patrício
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2022
Pipe joining by mechanical conformation in thin sheets with rotary locking via a notch
Gilmar Cordeiro Silva, Samara Christina Rodrigues Soares, Alysson Lucas Vieira
Engineering Structures, 2021
Analysis of an automotive coil spring fracture
Felipe Bergh, Gilmar Cordeiro Silva, Caio Silva, Pedro Paiva
Engineering Failure Analysis, 2021
New milling methodology for sealing planes in AlSi9Cu3(Fe) alloy machined with PCD tool
Gilmar Cordeiro da Silva, Querlem Martins Saraiva, José Rubens Gonçalves Carneiro, Izabela Ângela Santos, Anderson Silva José
International Journal of Advanced Manufacturing Technology, 2021
Residual stress and surface microhardness post-milling in 2205 duplex steel
Carlos Eduardo dos Santos, José Rubens Gonçalves Carneiro, Gilmar Cordeiro da Silva, Pedro Paiva Brito, Ítalo Bruno dos Santos, Thais Roberta Campos
International Journal of Advanced Manufacturing Technology, 2021
Incremental stamping forming with use of roller ball tool in aluminum and magnesium alloy
Daniel de Castro Maciel, Gilmar Cordeiro da Silva, Lucas Mendes de Quadros
International Journal of Advanced Manufacturing Technology, 2020
Analytical, numerical, and experimental investigation of the influence of lubrication on the drawing behavior of copper alloy
Gilmar Cordeiro Silva, Norberto Martins, Izabela A. Santos, Alysson L. Vieira
International Journal of Advanced Manufacturing Technology, 2020
Study of replacement of nylon by polypropylene composite and glass fiber
Gilmar Cordeiro da Silva, Geraldo Flávio Ximenes Ladeira, Hermano Nascimento Júnior, José Rubens Gonçalves Carneiro
Revista Materia, 2019
Wear and Thermal Analysis of WC Inserts in Turning Operations by Fuzzy Modeling
G.C. Silva, B.M. Malveira, J.R.G. Carneiro, P.P. Brito, T.A. Silva
Procedia CIRP, 2017
The method of finite elements in conformational mechanics
Metalurgia E Materiais, 2002