Open AccessFatigue investigation of threaded pipe connections
Author(s) -
Jeroen Van Wittenberghe,
Jan De Pauw,
Patrick De Baets,
Wim De Waele,
Magd Abdel Wahab,
Wouter Ost,
Guido De Roeck,
Tung Thanh Bui
Publication year - 2010
Publication title -
sustainable construction and design
Language(s) - English
Resource type - Journals
eISSN - 2295-9092
pISSN - 2032-7471
DOI - 10.21825/scad.v1i1.20424
Subject(s) - drill pipe , casing , structural engineering , bending , finite element method , connection (principal bundle) , drill , engineering , materials science , mechanical engineering
Threaded pipe connections are used to connect well casing, well tubing, drill pipes and risers.For many of these applications fatigue resistance plays an important role. In this study the fatigueproperties of threaded connections are studied using a combination of finite element modelling andexperimental testing. Using 2D axisymmetric FE analysis several connections are compared. It is shownthat the load distribution over the engaged threads is an important feature. Experimental tests are carriedout on three setups. A small scale four-point bending setup is used to develop S-N curves. An S-N curve fora standard API Line Pipe connection is compared to an S-N curve for a connection that showed animproved load distribution over the engaged threads in the FE analysis. On a medium scale four-pointbending setup, strains together with crack opening are measured. The strain measurements are comparedwith the strains obtained by the numerical model. Finally a full scale resonant bending fatigue setup ispresented, which will be used in future testing of pipe connections ranging from 168 mm (6”) to 508 mm(20”) in diameter.