Citation

Budhe S, Banea MD, De Barros S. J. Fail. Anal. Prev. 2019; 19(6): 1832-1843.

Copyright

(Copyright © 2019, ASM International, Publisher Holtzbrinck Springer Nature Publishing Group)

DOI

10.1007/s11668-019-00782-z

PMID

unavailable

Abstract

The present paper is concerned with the failure analysis of the wall loss defect in pipelines reinforced with a polymer-based composite repair system. The main goal is to propose a methodology that accounts for the pipe extremities (axial stress) in an analysis to predict an accurate failure pressure. The proposed methodology defines a simple expression for a real test specimen condition (closed-cap cylinder), which allows to estimate the failure pressure using the elastic properties of the materials and test specimen geometry. Hydrostatic tests performed in different laboratories are used to validate the proposed methodology. The results show a good agreement between the model prediction and the experimental failure pressure results in all cases. However, a careful selection of the remaining strength factor is needed, as it impacts on the accuracy and conservative level of the failure pressure. In addition to the axial stress, there is a possibility to refine the theoretical prediction of the failure pressure value by accounting for the plastic deformation far from the defect region as well as the radial stress in the failure analysis.

Language: en