Abstract

This study focuses on the application of composite materials for strengthening and repairing worn pipelines. The influence of various structural and operational factors on the stress state of a pipe reinforced with a composite wrap was investigated. A comparative analysis was conducted between the calculations of a steel pipe reinforced with a composite using the finite element method and several analytical methods, including those specified in DSTU ISO 24817:2019. Numerical and analytical calculations were carried out according to a full factorial experiment plan (three factors at three levels, twenty-seven experiments in total), with the variable factors being the wrap thickness, pipe thickness, and the ratio of residual thickness to pipe thickness. The calculations involved two system variants: "undamaged pipe" and "damaged pipe." A new analytical approach was proposed to determine the stress-strain state of the "pipe-composite wrap" system, which provides higher accuracy compared to DSTU ISO 24817:2019.

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