New interpretations of gripping force tests for lined pipes

作者：Vedeld Knut^*; Osnes Harald; Fyrileiv Olav

来源：Marine Structures, 2012, 29(1): 152-168.

DOI：10.1016/j.marstruc.2012.10.004

• Lined pipes
• Gripping force
• Saw test
• Ring-split test
• API 5LD

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.

• 出版日期2012-12