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Erschienen in: Experimental Mechanics 4/2024

12.03.2024 | Research paper

Residual Stress Measurements in Tensile Armours of Flexible Pipes by the Contour and X-Ray Diffraction Methods

verfasst von: I.L. Diehl, C.A. Theis Soares Diehl, T.R. Schifelbain de Lima, T.G. Rosauro Clarke, M. Torres Piza Paes

Erschienen in: Experimental Mechanics | Ausgabe 4/2024

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Abstract

Background

Excessive levels of residual stresses (RS) in metallic components of flexible pipes can lead to failure by fatigue or stress-corrosion cracking (SCC) mechanisms. Accurate measurements of residual stresses are essential in order to support comprehensive integrity assessments of these structures.

Objective

This paper aims at proposing a methodology for in-field evaluation of the residual stresses in the tensile armour of flexible pipes. This methodology is evaluated by comparing results from the contour method (CM), a portable (PXRD) and a benchtop (BXRD) X-ray diffractometer.

Methods

A set of samples with a controlled RS state was used to evaluate PXRD depth-profiles by comparison with BXRD measurements. CM was used to investigate stress values elsewhere in the cross-section of the samples. PXRD was then used to measure the total stress on a full-scale flexible riser.

Results

Strong texture was seen in XRD measurements due to the preferential orientation in the samples, but a method to overcome this is proposed. RS measurements with PXRD were in close agreement with BXRD values in all samples. Total stress profiles obtained by PXRD on a tensile armour of flexible pipe are given. CM did not provide reliable results in the near-surface region of shot-peened samples, but reasonable agreement was found with BXRD after manual adjustment of a smoothing parameter when depths from 0.3 mm to 1.5 mm were analyzed.

Conclusion

A methodology has been established for non-destructive in-loco profiling of the total stress state in tensile armours of flexible pipes with PXRD; in a real application scenario it could provide valuable information that could help to understand damage initiation mechanisms.

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Metadaten
Titel
Residual Stress Measurements in Tensile Armours of Flexible Pipes by the Contour and X-Ray Diffraction Methods
verfasst von
I.L. Diehl
C.A. Theis Soares Diehl
T.R. Schifelbain de Lima
T.G. Rosauro Clarke
M. Torres Piza Paes
Publikationsdatum
12.03.2024
Verlag
Springer US
Erschienen in
Experimental Mechanics / Ausgabe 4/2024
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-024-01045-1

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