![]() ![]() Through the analysis on applying different reinforcement schemes, we indicated that increasing the amount of composite layers evidently facilitated the reinforcement effectiveness, while increasing the bond length did not and the inversely diagonal wrapping pattern performance less effective. In addition, CRS reinforcement has increased the stiffness of the surface cracked pipes. The results showed that within the surface crack growth stage, the composite laminates were adequately bonded on the steel substrate, which significantly decreased the crack growth rate and prolonged the residual fatigue life. During the tests, the crack growth results, as well as the strain on the external mid-bottom composite laminate around the cracked area, and the vertical deflection of the specimens were recorded. CRS reinforced surface cracked API 5L X65 pipes were tested, containing three initial notch sizes and four reinforcement schemes. In this paper, we experimentally studied the external surface crack growth in steel pipes reinforced with Composite System Repaired (CRS).
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