Effects of Taper Variation on Conical Threaded Connections Load Distribution

[+] Author and Article Information
S. Baragetti, Ph.D.

Dip. to Meccanica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy

J. Mech. Des 124(2), 320-329 (May 16, 2002) (10 pages) doi:10.1115/1.1456459 History: Received July 01, 2000; Online May 16, 2002
Copyright © 2002 by ASME
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Dimensioned sketches of the pin and box elements and of the thread (linear dimensions in millimeters)
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Finite element model of the API standard NC50 connection
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(a) Magnified section of the threads engaged; (b) strip of material belonging to the terminal part of the box element
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(a) Relationship between temperature increase and internal axial induced load, for the standard NC50 connection; (b) RFL trend induced by the application of make-up torque equal to 24×103 Nm; (c) conventions used to number the pin and box threads
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(a) Trend of the axial, circumferential and radial stresses; (b) of the contact pressure on the first thread engaged (make-up torque =24×103 Nm)
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(a) Experimental equipment; (b) strain gages set up (all dimensions in millimeters)
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Comparison between the numerical and experimental results respectively for the NC50 standard connection and for the modified one: induced shoulder axial loads Qup equal to (a)435×103 N and (b)1,525×103 N
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Comparison between the trends of the RFL parameter obtained by using three different taper values for the pin element: standard taper equal to 166.66×10−3 m/m, 156.66×10−3 m/m, and 158.36×10−3 m/m (make-up torque=24×103 Nm)
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Comparison between the trends of the contact pressures on the first thread engaged “1” obtained by using three different taper values for the pin element: standard taper equal to 166.66×10−3 m/m, 156.66×10−3 m/m, and 158.36×10−3 m/m (make-up torque=24×103 Nm)
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Comparison between the trends of the Von Mises stresses for the different thread sections of the pin element obtained by using (a) a pin taper value of 156.66×10−3 m/m and (b) a standard pin taper value of 166.66×10−3 m/m (make-up torque=24×103 Nm)



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