Change search
ReferencesLink to record
Permanent link

Direct link
Deformasjon av trykksatte rørledninger
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Energy and Process Engineering.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Offshore pipelines may be subjected to impact by anchor and trawl gear. An anchor impact will drag the pipeline out of its position, before it is released and the pipe straightens, due to the rebound and large axial forces. Damage and fracture may occur due to the highly complex stress and strain history in the pipe. This thesis is a continuation of work carried out in previous master theses on the subject and a part of an ongoing research program at SIMLab (NTNU) and Statoil ASA. Three pipes were deformed quasi-statically with different horizontal loads applied in the stretch bending rig at SIMLab. A deformation rate of 25 mm/min was applied. A visual inspection after bending could not reveal any cracks. An isotropic hardening material model was used as input for the numerical simulations in Abaqus/Explicit by the use of the SIMLab Material Model. A very good fit in the global response could be seen when comparing the numerical simulations with the corresponding experiments. When checking the strain evolution for the critical elements, a plastic hinge could be seen. It could also be seen that the largest strains were smaller in pipes with horizontal load compared to pipes without horizontal load. Digital Image Correlation was utilized to validate the numerical simulations, by comparing strains close to the indentation zone. This gave a reasonably well compliance.

Place, publisher, year, edition, pages
Institutt for konstruksjonsteknikk , 2013. , 117 p.
URN: urn:nbn:no:ntnu:diva-24390Local ID: ntnudaim:10309OAI: diva2:708494
Available from: 2014-03-27 Created: 2014-03-27 Last updated: 2014-03-27Bibliographically approved

Open Access in DiVA

fulltext(20695 kB)3025 downloads
File information
File name FULLTEXT01.pdfFile size 20695 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(1161 kB)2 downloads
File information
File name COVER01.pdfFile size 1161 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Energy and Process Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 3025 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 72 hits
ReferencesLink to record
Permanent link

Direct link