In this paper, four-point bending experiments are performed to determine the fatigue life of several threaded pipe couplings. It is shown that fatigue life of these couplings can be improved by designing them with more uniform load distribution in the threads, achieved through reducing the global and local stiffness of the coupling. Finite element simulations of a 2D axisymmetric model show consistence between experimental observation and analytical modeling. A 3D finite element simulation, which includes nonlinear material behavior, elaborate contact properties and represents the coupling geometry more accurately, is also performed to evaluate the 2D axisymmetric finite element model.
The Influence of Connection Geometry on the Fatigue Life of National Pipe Thread Threaded Pipe Couplings
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 14, 2010; final manuscript received May 8, 2012; published online November 28, 2012. Assoc. Editor: Hakim A. Bouzid.
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Van Wittenberghe, J., De Baets, P., De Waele, W., and De Pauw, J. (November 28, 2012). "The Influence of Connection Geometry on the Fatigue Life of National Pipe Thread Threaded Pipe Couplings." ASME. J. Pressure Vessel Technol. February 2013; 135(1): 011201. https://doi.org/10.1115/1.4007284
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