Experimental Study of Tensile Strength in Composite Floats Structure Repaired with Multi-Layer Patches

Repair of cracked composite structural components and plates according to repair standards is increased year on year. Patched repair reduces the stress field near the crack by bridging the stresses between the cracked plate and the composite patch, leads to retardation or complete stoppage of the crack growth, provides high structural efficiency and extends the life of cracked structural components at an economical cost. This study is investigated the repair process of the cracked float composite structures through the experiments. At first, composite specimens are constructed similar to the composite body of a marine float, and after done damage on it, they were repaired by multi-layer patches. Then, the tension test was done on samples and the effect of some parameters on tensile strength was studied. These parameters are bonded angle, resin type, fiber type, lay-up techniques, the percentage of resin compound and hardener. Finally, the results of tests showed that the bonded angel and lay-up techniques are the most important parameters on tensile strength in repaired composite components.