LAUSR

Abstract Under the influence of environmental and transmission mediums, marine pipes are threatened by corrosion. The composite material repair method is very practical and efficient for external corroded pipes, and it has been widely used in recent years. In this paper, to study the interfacial stresses of a corroded pipe repaired with carbon fiber reinforced polymers (CFRP), a theoretical mechanical model of a perfect pipe repaired with CFRP is constructed firstly, and then the interface stresses are obtained for the reinforced pipe under tension and bending, with a modification of stresses using the residual strength factor. the interface stresses are obtained for the reinforced pipe under tension and bending, with a modification of stresses using the residual strength factor. The debonding load for the corroded pipe repaired with CFRP is calculated based on the damage failure criteria of the adhesive layer. A finite element model (FEM) for corroded pipes repaired with CFRP is constructed to achieve the interface stresses and the debonding load, and the tension experiment is also done to achieve the initial debonding loads. The theoretical results and FEM results are found to have good coherence with the experimental results. Finally, the relationship between the debonding load and the aging time is obtained based on the degradation rules of adhesive peeling and shear strength.