Abstract
Fully encircled bonded composite repairs in pipelines have proven effective since their introduction in the early 1990s. These fully encircled repairs completely wrap around the pipe and the defect like a sleeve. As operators became more familiar with fully encircled repairs, and as their capabilities improved, application in larger pressure equipment became viable. Increase in equipment application size corresponds to an increase in material cost and application difficulty. As such, the effectiveness of smaller patch-type repairs is of interest. Patch-type repairs, as opposed to fully encircled repairs, do not completely surround the pipe and defect, but rather only a specified area over the defect. This paper presents pressure fatigue tests comparing the performance of fully encircled and patch-type repairs installed on 6-in. nominal steel pipe with through-wall defects. Repair strain, substrate strain, and fatigue life are compared for both the fully encircled and patch-type repair. Finite element simulation results are compared to the experimental results to validate existing material models and simulation boundary conditions.
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Acknowledgments
This work was made possible by the Department of Transportation Cooperative Agreement (FOA #DTPH5614SN000006) and The University of Tulsa.
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© 2017 The Society for Experimental Mechanics, Inc.
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Theisen, S.A., Keller, M.W. (2017). Comparison of Patch and Fully Encircled Bonded Composite Repair. In: Ralph, W., Singh, R., Tandon, G., Thakre, P., Zavattieri, P., Zhu, Y. (eds) Mechanics of Composite and Multi-functional Materials, Volume 7 . Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-41766-0_11
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DOI: https://doi.org/10.1007/978-3-319-41766-0_11
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