Abstract
In this paper, a simplified method is performed to predict the fatigue crack growth life of repaired pipes by glass/epoxy composite patches. For this purpose, an already developed automatic procedure by the authors is adapted to handle 3D crack growth analyses of repaired pipes subjected to internal cyclic pressure. The analyses are performed for offshore pipes made of low-strength steel containing an initial fatigue corrosion crack and repaired by glass/epoxy composite patch. Finally, an equation is presented here suggesting a point along the thickness of a repaired pipe in which, the calculated fatigue crack growth life based on the fracture parameters of that point in a simple uniform crack growth modeling along the pipe thickness (UCG) is almost equal to the calculated fatigue life in non-uniform crack growth analysis (NUCG) or a real crack-front modeling approach.
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