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Non-grain oriented electrical steel photomicrograph classification using transf...
Ivo, Roberto Fernandes; Rodrigues, Douglas de Araújo; Bezerra, Gabriel Maia; Freitas, Francisco Nélio Costa; Abreu, Hamilton Ferreira Gomes deAmong the many factors that contribute to achieving a sustainable and efficient economy is the raw material of machinery and equipment of strategic sectors. Non-grain oriented (NGO) electrical steel is used in the manufacturing of electric motors. Therefore, it is directly related to the electromagnetic efficiency of engines both in industry and in homes. This work aims to develop an intelligent 1.26% Si NGO el...
New approach to evaluate a non-grain oriented electrical steel electromagnetic ...
Rebouças Filho, Pedro Pedrosa; Santos, José Ciro dos; Freitas, Francisco Nélio Costa; Rodrigues, Douglas de Araújo; Ivo, Roberto FernandesThe growing global demand for energy makes it necessary to adopt measures ranging from the exploration of new energy sources to the development of technology for machinery and equipment with greater energy efficiency. Non-grain oriented electrical steels are widely used in the construction of rotors and stators that form the core of electric motors, and their microstructures are directly related to its electrom...
Study and classification of the Crystallographic Orientation Distribution Funct...
Ivo, Roberto Fernandes; Rodrigues, Douglas de Araújo; Santos, José Ciro dos; Freitas, Francisco Nélio Costa; Herculano, Luís Flávio GasparThis article discusses a fast and efficient classification of non-grain oriented electrical steel and its electromagnetic efficiency based on the analysis of the images of the Crystalline Orientation Distribution Function (CODF). The study was carried out on samples of a non-grain oriented electrical steel, semi-processed with 1.28% silicon, cold rolled with thickness reductions of 50.0% and 70.0%, and annealed...
Sistema computacional para determinação da taxa de diluição em soldadura
Rebouças Filho, Pedro Pedrosa; Cavalcante, Tarique da Silveira; Albuquerque, Victor Hugo Costa de; Silva, Cleiton Carvalho daDiluição da solda é a modificação da composição química do metal de adição, causada pela parcela do metal de base que sofreu fusão e passou a compor a zona fundida. Sendo dada pela percentagem do metal de base que participa na formação do cordão de solda. A sua medição, em geral, é obtida manualmente utilizando-se softwares genéricos de desenho ou de processamento e análise de imagem. Neste sentido, o presente ...
Ferramenta computacional para análise de imagens de ensaios mecânicos de dureza
Rebouças Filho, Pedro Pedrosa; Albuquerque, Victor Hugo Costa de; Cavalcante, Tarique da Silveira; Tavares, João Manuel Ribeiro da SilvaThis paper presents a computational tool capable of determining the Brinell and Vickers hardnesses from identation images. The tool integrates algorithms of image processing and analysis such as region growing and snakes. For validation purpose, the results obtained by the developed tool were compared with those obtained by the conventional process from identations made in ABNT 1020 steel. The comparison confir...
Desenvolvimento de programa computacional para medição semi-automática de altur...
Ribeiro, Alyson Bezerra Nogueira; Cavalcante, Tarique da Silveira; Rebouças Filho, Pedro PedrosaThe dilution of the weld is a process that causes the change of the compositional elements of the filler metal that, due to the fusion occurring in fractions of metal, is the emergence of a new compound to the fusion zone. One can measure the dilution rate by the percentage of the base metal found in the weld bead. There are some factors that influence this rate, among which the type of joint to be soldered, th...
Simulação de tratamentos térmicos empregando o método dos volumes finitos
Cavalcante, Tarique da Silveira; Araújo, André Luiz de Souza; Rebouças Filho, Pedro PedrosaHeat treatments are very common practices and of great importance for the metalworking industry. It modify very significantly the mechanical properties of several commercial alloys, particularly steels, which occupy an outstanding position among all materials used today, through controlled heating and cooling. In recent years, the interest in developing numerical applications able to simulate the phenomena and ...
Aplicação do método de contornos ativos radial para medição de dureza Brinell u...
Alexandria, Auzuir Ripardo de; Cortez, Paulo César; Almeida, Thomaz Maia de; Bessa, Jéssyca Almeida; Cavalcante, Tarique da SilveiraThe active contour methods have obtained good results in image segmentation when low signal/noise relationship is found. These techniques consist in the minimization of the total energy of the contours, calculated by the sum of the internal energy (function of the curve’s geometry) and the external energy (which depends on the characteristics of the image that is going to be segmented). Traditionally, the exter...
Desenvolvimento de sistema para análise de termograma visando detectar falhas u...
Ribeiro, Alyson Bezerra Nogueira; Cavalcante, Tarique da Silveira; Rebouças Filho, Pedro Pedrosa; Silva, Cesar CipelliThermography allows the visualization of the infrared spectrum for analysis of thermal images, which are thermograms that allow direct observation of the distribution of body heat. This inspection technique, through the decomposition of the infrared spectrum color temperature radiated by the object, measures the distribution of surface temperature. The purpose of performing this inspection is to detect and diag...
Desenvolvimento de um software para determinação da densidade de nódulos de gra...
Ribeiro, Alyson Bezerra Nogueira; Rebouças Filho, Pedro Pedrosa; Cavalcante, Tarique da SilveiraO ferro fundido nodular é uma liga Fe-C-Si em que o carbono encontra-se na forma de grafita esferoidal no estado bruto de fundição. Essa liga substitui o ferro cinzento e o aço em variadas aplicações, entre elas cambotas, sapatas e tambores de travões, diferenciais, rodas dentadas, válvulas, condutas de água e outros fluidos, e lingoteiras. As propriedades mecânicas do ferro fundido nodular dependem da densidad...