STUDY ON STRAIN ACCUMULATION OF CARBON STEEL PRESSURIZED PIPING ELBOWS UNDER DYNAMIC OUT-OF-PLANE BENDINGS

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ZAKAVI SEYED JAVID; NOURBAKHSH MOHAMMAD

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Journal: Modares Mechanical Engineering Year:2015 | Volume:14 | Issue:15 Page(s): 218-224

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Title

STUDY ON STRAIN ACCUMULATION OF CARBON STEEL PRESSURIZED PIPING ELBOWS UNDER DYNAMIC OUT-OF-PLANE BENDINGS

Author(s)

ZAKAVI SEYED JAVID | NOURBAKHSH MOHAMMAD | Issue Writer Certificate

Keywords

ELBOWQ2

RATCHETING STRAINQ2

STRAIN HARDENINGQ2

OUT-OF-PLANE DYNAMIC MOMENTQ2

Abstract

In this paper, using the Armstrong-Frederick nonlinear kinematic hardening model, the ratcheting behavior of carbon steel piping ELBOWs is described under conditions of steady internal pressure and dynamic moments out-of-plane at frequencies typical of seismic excitations. The ELBOWs had an outside diameter of 60.3 mm and thicknesses of 3.91 and 5.54 mm. For each thickness two bend radius geometries (long and short) were studied. A pure out-of-plane bending moment applied at one end of a 90° welding ELBOW is reacted by a purely torsional moment at the other end. Three-dimensional elastic-plastic analyses by Armstrong-Frederick nonlinear kinematic hardening model are carried out to evaluate structural ratcheting behaviors. Initially, the rate of ratcheting is high and then decreases with the increasing cycles. While there is practically no strain accumulation in the axial direction, the direction of highest ratcheting is along the hoop direction. The cyclic strain accumulation against response moment for each component is assessed. By Armstrong-Frederick model, the predicted ratcheting of low moments is near to the experimental results, while for the high moment, this model will over-predict the RATCHETING STRAIN.

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APA: Copy

ZAKAVI, SEYED JAVID, & NOURBAKHSH, MOHAMMAD. (2015). STUDY ON STRAIN ACCUMULATION OF CARBON STEEL PRESSURIZED PIPING ELBOWS UNDER DYNAMIC OUT-OF-PLANE BENDINGS. MODARES MECHANICAL ENGINEERING, 14(15), 218-224. SID. https://sid.ir/paper/177701/en

Vancouver: Copy

ZAKAVI SEYED JAVID, NOURBAKHSH MOHAMMAD. STUDY ON STRAIN ACCUMULATION OF CARBON STEEL PRESSURIZED PIPING ELBOWS UNDER DYNAMIC OUT-OF-PLANE BENDINGS. MODARES MECHANICAL ENGINEERING[Internet]. 2015;14(15):218-224. Available from: https://sid.ir/paper/177701/en

IEEE: Copy

SEYED JAVID ZAKAVI, and MOHAMMAD NOURBAKHSH, “STUDY ON STRAIN ACCUMULATION OF CARBON STEEL PRESSURIZED PIPING ELBOWS UNDER DYNAMIC OUT-OF-PLANE BENDINGS,” MODARES MECHANICAL ENGINEERING, vol. 14, no. 15, pp. 218–224, 2015, [Online]. Available: https://sid.ir/paper/177701/en

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