Effects of Over-Torque on Stress Relief in Conical Threaded Connections

[+] Author and Article Information
S. Baragetti

Dipartimento di Progettazione e Tecnologie, Università degli Studi di Bergamo, Viale Marconi 5, 24044 Dalmine (Bg), Italye-mail: sergio.baragetti@unibg.it

A. Terranova

Dipartimento di Meccanica, Politecnico di Milano, P.zza Leonardo da Vinci, 32-20133 Milano, Italy

J. Mech. Des 126(2), 351-358 (May 05, 2004) (8 pages) doi:10.1115/1.1666892 History: Received March 01, 2003; Online May 05, 2004
Copyright © 2004 by ASME
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Sketch of the NC50 connection: box and pin elements
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Axisymmetric finite element model
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Finite element models: details of the mating surfaces of the threads and of the shoulder area
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(a) modification of box shoulder, (b) position of axial and circumferential strain gages on the machined shoulder face, (c) position of the strain gage chain on the inner surface of the pin element, (d) sketch of the experimental equipment for make-up torque application
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Axial and circumferential strain trends for Mup=24 kNm
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Axial and circumferential strain trends for Mup=24 kNm after the application of over-torque of 38.5 kNm
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Trend of the axial circumferential and radial stresses for Mup=24 kNm at the first thread of the pin element engaged
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RFL for (a) Mup=24 kNm with and without over-torque and (b) Mup=24 kNm and further tensile or compressive axial load
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RFL for (a) Mup=24 kNm after over-torque and tensile load application and (b) Mup=24 kNm after over-torque and compressive load application



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