The objective of the study is to determine the effect of diameter/thickness (D/T) ratio on the interaction of axial force, bending moment, torsion and internal pressure in plain pipes. The Tresca and von Mises criteria are used to determine the first yield behavior of pipes when subjected to combined loads. The results show that for certain load combinations, the load interaction behavior is affected by D/T ratio and some load interaction relations change with a load dominance. The general trend is an increase in effective stress as D/T is increased. Most design codes show slightly conservative pipe design.
Issue Section:
Research Paper
1.
Ayob
, A. B.
, Moffat
, D. G.
, and Mistry
, J.
, 1997
, “Load Interaction in Pressurised Structures Using the Finite Element Method
,” Int. J. Pressure Vessels Piping
, 73
(1
), pp. 3
–9
.2.
Godoy
, L. A.
, Idelsohn
, S. R.
, and Barbero
, E.
, 1991
, “On Load Interaction in the Non Linear Buckling Analysis of Cylindrical Shells
,” Adv. Eng. Software
, Elsevier Ltd., UK, 13
(1
), pp. 46
–50
.3.
Hsieh
, M. F.
, Moffat
, D. G.
, and Mistry
, J.
, 2001
, “Nozzles in the Knuckle Region of a Torispherical Head: Limit Load Interaction Under Combined Pressure and Piping Loads
,” Int. J. Pressure Vessels Piping
, 77
(13
), pp. 807
–815
.4.
Finlay
, J. P.
, Rothwell
, G.
, English
, R.
, and Montgomery
, R. K.
, 2003
, “Effective Stress Factors for Reinforced Butt-Welded Branch Outlets Subjected to Internal Pressure or External Moment Loads
,” Int. J. Pressure Vessels Piping
, 80
(5
), pp. 311
–331
.5.
PATRAN Elsevier Ltd., UK, version 7, 1993-1997; PDA Engineering, Santa Ana, CA.
6.
ASAS-H Version 13, 2004, WS Atkins Engineering Softwares, UK.
7.
European Standard EN 13480-3, 2002, Metallic Industrial Piping: Design and Calculation, CEN European Committee for Standardisation.
Copyright © 2004
by ASME
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