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Numerical modelling and experimental validation of a threaded pipe connection under axial tension

Jeroen Van Wittenberghe (UGent) , Timothy Galle (UGent) , Patrick De Baets (UGent) and Wim De Waele (UGent)
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Abstract
In order to improve a threaded pipe connection’s fatigue life, accurate knowledge is necessary of the acting stresses and strains while subjected to external loads. In this study the stress distribution over an API Line Pipe threaded connection subjected to an axial load is studied using a 2D axisymmetric finite element model. It is shown that a non-uniform load distribution over the different threads causes a high stress concentration factor at the last engaged thread of the male part of the connection. The simulated results are compared to strain gauges measurements obtained during a quasistatic axial tensile test on a 4.5” API Line Pipe connection. A good correspondence is found between the two data sets, which proves the validity of the 2D axisymmetric model. Following the quasi-static tensile test, a fatigue test is carried out on the sample in the same test setup. A fatigue crack initiated at the root of the LET thread of the male part of the connection, which is the location where the highest stress concentration appears in the simulations.
Keywords
threaded pipe connection, experiment, pipeline, finite element model

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Chicago
Van Wittenberghe, Jeroen, Timothy Galle, Patrick De Baets, and Wim De Waele. 2011. “Numerical Modelling and Experimental Validation of a Threaded Pipe Connection Under Axial Tension.” In Synergy in the Technical Development of Agriculture and Food Industry (Synergy2011), ed. Zoltán Kurják and László Magó. Gödöllö, Hungary: Szent István University. Faculty of Mechanical Engineering.
APA
Van Wittenberghe, J., Galle, T., De Baets, P., & De Waele, W. (2011). Numerical modelling and experimental validation of a threaded pipe connection under axial tension. In Z. Kurják & L. Magó (Eds.), Synergy in the technical development of agriculture and food industry (Synergy2011). Presented at the 2nd International conference on Agricultural Engineering (Synergy 2011) : Synergy in the technical development of agriculture and food industry, Gödöllö, Hungary: Szent István University. Faculty of Mechanical Engineering.
Vancouver
1.
Van Wittenberghe J, Galle T, De Baets P, De Waele W. Numerical modelling and experimental validation of a threaded pipe connection under axial tension. In: Kurják Z, Magó L, editors. Synergy in the technical development of agriculture and food industry (Synergy2011). Gödöllö, Hungary: Szent István University. Faculty of Mechanical Engineering; 2011.
MLA
Van Wittenberghe, Jeroen, Timothy Galle, Patrick De Baets, et al. “Numerical Modelling and Experimental Validation of a Threaded Pipe Connection Under Axial Tension.” Synergy in the Technical Development of Agriculture and Food Industry (Synergy2011). Ed. Zoltán Kurják & László Magó. Gödöllö, Hungary: Szent István University. Faculty of Mechanical Engineering, 2011. Print.
@inproceedings{1935907,
  abstract     = {In order to improve a threaded pipe connection{\textquoteright}s fatigue life, accurate knowledge is necessary of the acting stresses and strains while subjected to external loads. In this study the stress distribution over an API Line Pipe threaded connection subjected to an axial load is studied using a 2D axisymmetric finite element model. It is shown that a non-uniform load distribution over the different threads causes a high stress concentration factor at the last engaged thread of the male part of the connection. The simulated results are compared to strain gauges measurements obtained during a quasistatic axial tensile test on a 4.5{\textquotedblright} API Line Pipe connection. A good correspondence is found between the two data sets, which proves the validity of the 2D axisymmetric model. Following the quasi-static tensile test, a fatigue test is carried out on the sample in the same test setup. A fatigue crack initiated at the root of the LET thread of the male part of the connection, which is the location where the highest stress concentration appears in the simulations.},
  articleno    = {o6\_130},
  author       = {Van Wittenberghe, Jeroen and Galle, Timothy and De Baets, Patrick and De Waele, Wim},
  booktitle    = {Synergy in the technical development of agriculture and food industry (Synergy2011)},
  editor       = {Kurj{\'a}k, Zolt{\'a}n and Mag{\'o}, L{\'a}szl{\'o}},
  isbn         = {9789632692500},
  keyword      = {threaded pipe connection,experiment,pipeline,finite element model},
  language     = {eng},
  location     = {G{\"o}d{\"o}ll{\"o}, Hungary},
  pages        = {5},
  publisher    = {Szent Istv{\'a}n University. Faculty of Mechanical Engineering},
  title        = {Numerical modelling and experimental validation of a threaded pipe connection under axial tension},
  year         = {2011},
}