Abstract
This paper aims to identify the mechanical properties of the hull plate of fiber reinforced plastics, which occupies 95.5% of the registered domestic fishing vessels for strength improvement after a repair by changing reinforced materials. Under the present legislations, in case of repairing the hull plate of fiber reinforced plastics, localized repair using only V- and X-scarf methods are acknowledged. The existing glass fiber reinforced material was replaced with the hybrid laminated method of carbon and aramid fiber before being applied to repair surface of scarf-processed parent material and by comparing the strength with the existing glass fiber mat and roving combination. The use effect when repairing the hull made of hybrid fiber rather than glass fiber was found. As a result of the repaired hull plate, the hybrid joint type exhibited an overall reduction in tensile joint efficiency rather than the existing resin and glass fiber roving and mat combination. However, in flexural joint efficiency improved in specimen applying aramid fiber hybrid compared to the existing joint method improved by up to 77.4%. A 1:12 scarf joint had a high effect in flexural strength rather than tensile strength. When carbon-aramid fiber was used partially appropriately by replacing the existing glass fiber, joint efficiency improved.
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