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A platform for research: civil engineering, architecture and urbanism
New interpretations of gripping force tests for lined pipes
Abstract Surface interaction properties between the backing steel and liner in lined pipes are important features in terms of understanding the mechanical behavior of lined pipes. Presently API 5LD recommends a gripping force test to classify the surface interaction properties between the liner and the backing steel. In this paper, several details involving the influence of axial and hoop stress interaction, friction behavior and the influence of free boundaries are investigated in testing contexts. Published results using different testing regimes have been re-investigated in order to show the effects of accounting for axial strain release close to free boundaries, axial and hoop stress interaction and different friction behaviors. It has clearly been demonstrated that these effects must be accounted for when trying to accurately quantify surface interaction properties between liners and backing steels in physical testing contexts.
Highlights ► The ring-split test for lined pipes is investigated in detail. ► Published experiments and experiments conducted at Det Norske Veritas are used in the study. ► It is demonstrated that the current practice for interpreting ring-split tests, according to API 5LD is inaccurate. ► A new methodology is proposed, where analytical methods are applied to give more accurate interpretations of ring-split tests.
New interpretations of gripping force tests for lined pipes
Abstract Surface interaction properties between the backing steel and liner in lined pipes are important features in terms of understanding the mechanical behavior of lined pipes. Presently API 5LD recommends a gripping force test to classify the surface interaction properties between the liner and the backing steel. In this paper, several details involving the influence of axial and hoop stress interaction, friction behavior and the influence of free boundaries are investigated in testing contexts. Published results using different testing regimes have been re-investigated in order to show the effects of accounting for axial strain release close to free boundaries, axial and hoop stress interaction and different friction behaviors. It has clearly been demonstrated that these effects must be accounted for when trying to accurately quantify surface interaction properties between liners and backing steels in physical testing contexts.
Highlights ► The ring-split test for lined pipes is investigated in detail. ► Published experiments and experiments conducted at Det Norske Veritas are used in the study. ► It is demonstrated that the current practice for interpreting ring-split tests, according to API 5LD is inaccurate. ► A new methodology is proposed, where analytical methods are applied to give more accurate interpretations of ring-split tests.
New interpretations of gripping force tests for lined pipes
Vedeld, Knut (author) / Osnes, Harald (author) / Fyrileiv, Olav (author)
Marine Structures ; 29 ; 152-168
2012-10-12
17 pages
Article (Journal)
Electronic Resource
English
New interpretations of gripping force tests for lined pipes
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