Navegando por Autor "Carvalho Neto, Basílio Ferreira de"

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Corrosão intergranular no hélice de embarcação
(2021-08-20) Carvalho Neto, Basílio Ferreira de; Monteiro, Alberto de Castro; http://lattes.cnpq.br/8300386519703896; Monteiro, Alberto de Castro; http://lattes.cnpq.br/8300386519703896; Soares, José Josimar; http://lattes.cnpq.br/8049341977402653; Takeno, Mitsuo Lopes; http://lattes.cnpq.br/1152601799191567
Considering that the propeller is the ship's propulsion element and without it working together with the engine, the ship is going nowhere and with the passage of time since its invention in 1827. It comes more and more being modernized in its manufacturing process and model, being manufactured with more suitable and resistant materials, because nowadays we have larger ships and more powerful engines and therefore the propeller needs to keep up with this evolution. in order to study more about the propagation of cracks that occur along the contours of the grains. Therefore, it is necessary to know what caused great vibrations in the main axis and hull of the ship, and to discuss an analysis, an inspection and report the failure and cause of fracture of the material. Descriptive research is then carried out. Therefore, it appears that due to damage to the propeller as a result of the impact with a supposed tree trunk during navigation on the Amazon River, then the performance recovery generated a tension in the affected area, due to this propeller performance generated in the affected area a crack that was welded to repair it and finally it resulted that the right thing to do was to have to reduce the four blades evenly to maintain the balance of the propeller and end the excessive vibration in the ship, which imposes the finding that what led to the fracture of the helix in the repaired area was an intergranular corrosion. The granular corrosion that is, the propagation of cracks that occurs along the grain boundaries, is the rupture in the propeller blade.