Rotary shouldered connections (RSC), used in the oil and gas industries, are probably the most stressed components of the drill string because they are subjected both to make-up torque and to axial and bending loads. Since loads can vary and can result in fatigue crack initiation and propagation, there is often severe damage to the first threads engaged. Such damage leads to shoulder load reduction and discontinuity in the drill string. Once we know the geometric dimensions and the materials of the pin and box elements composing the RSCs, API standards make it possible to evaluate the working limits of RSCs when they are subjected to make-up torque, torsion and tension. It is not, however, possible to establish the stress state of the connection for extreme working limits. The aim of this paper is to propose a numerical procedure, confirmed by full-scale experimental tests, which enables the evaluation both of the working limits, combined make-up and axial tensile loads, and of the stress state of RSCs for any load condition and, in particular, when RSCs are subjected to extreme combinations of make-up, torsion and axial tensile loads.
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September 2001
Technical Papers
Rotary Shouldered Thread Connections: Working Limits Under Combined Static Loading
S. Baragetti,
S. Baragetti
Dip. to Meccanica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy
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A. Baryshnikov
A. Baryshnikov
ENI-AGIP spa, Via Emilia 1, 20097 S. Donato Milanese (Milano), Italy
Search for other works by this author on:
S. Baragetti
Dip. to Meccanica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy
A. Baryshnikov
ENI-AGIP spa, Via Emilia 1, 20097 S. Donato Milanese (Milano), Italy
Contributed by the Reliability, Stress Analysis & Failure Prev. Committee for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received June 2000. Associate Editor: J. Gao.
J. Mech. Des. Sep 2001, 123(3): 456-463 (8 pages)
Published Online: June 1, 2000
Article history
Received:
June 1, 2000
Citation
Baragetti, S., and Baryshnikov, A. (June 1, 2000). "Rotary Shouldered Thread Connections: Working Limits Under Combined Static Loading ." ASME. J. Mech. Des. September 2001; 123(3): 456–463. https://doi.org/10.1115/1.1371476
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