Estudo de reparos para embarcações navais à base de compósitos de poliéster e resina epóxi sobrepostas em chapas de aço ASTM A-131

Abstract

After the construction of a vessel, using steel material or fiber reinforced plastics, there is a need to carry out maintenance throughout its useful life. Among the most diverse areas of maintenance of a vessel, such as propulsion, diesel and electric engines, one of the most important is the repair of the hull structure. In steel ships, this repair is done replacing degraded plates with new ones with the same material specification, in fiber vessels, the repair is also done with new parts of the same material or the relamination technique is used using layers of resins and fibers. The objective of this study is to join these two universes, metallic materials and reinforced resins, and to carry out experiments (repairs), using a base of resins reinforced with fibers on naval structural steel sheets of the ASTM A-131 type. Mechanical tensile tests, Charpy impact, hardness and hydrostatic tests were carried out and both the adhesion capacity and the resistance of the composite were verified. Microscopy tests were carried out to verify the morphology of the composite samples, taken after the hydrostatic destructive test, to perform failure analysis. The tests proved to be quite satisfactory, with good adherence of the resin to the substrate, enduring a hydrostatic pressure of more than 35 bar, qualifying the study and approving the technique as an alternative for repairing a naval vessel in ASTM A-131 steel.