Rotary Shouldered Thread Connections: Working Limits Under Combined Static Loading

[+] Author and Article Information
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

J. Mech. Des 123(3), 456-463 (Jun 01, 2000) (8 pages) doi:10.1115/1.1371476 History: Received June 01, 2000
Copyright © 2001 by ASME
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New NC50 165×83 connection under applied make-up and tensile (static and dynamic) loads
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Dimensioned sketches both of the NC50 pin and box thread connections
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Axisymmetric finite element mesh of the NC50 thread connection
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Sketch of the modification of the NC50 box shoulder and position of the strain gages (“A”=axial strain gages, “C”=circumferential strain gages)
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Comparison between experimental and numerical results (make-up torque equal to 24 kNm).
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(a) Shoulder separation condition: a) make-up torque 5.13 kNm and tension 669 kN, b) make-up torque 30.36 kNm and tension 3674 kN. (b) Pin yielding condition: a) make-up torque 34.02 kNm and tension 3237 kN; b) make-up torque 45.31 kNm and tension 0 kN. RFL in shoulder separation and pin yielding conditions under combined loading.
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Trend of the percentage of load carried by the first-engaged thread for increasing values of make-up torque in a) pin yielding conditions and b) shoulder separation conditions
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Sketch of the equipment for tension and compression during make-up procedure
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Shoulder separation: comparison between the API diagram, FEA and the results obtained by applying make-up torques equal to Mup=9450 Nm and Mup=4700 Nm



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