Theoretical Modeling of Creep Behavior of Bellows and Some Applications

[+] Author and Article Information
Kazuyuki Tsukimori

Structure and Material Research Group, O-arai Engineering Center, Japan Nuclear Cycle Development Institute, O-arai, Ibaraki-ken, Japane-mail: mr-moon@hq.jnc.go.jp

J. Pressure Vessel Technol 123(2), 179-190 (Aug 03, 2000) (12 pages) doi:10.1115/1.1320817 History: Received December 20, 1999; Revised August 03, 2000
Copyright © 2001 by ASME
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Curved beam of 1/4 convolution cross section shape—(a) thin curved beam model; (b) arc part; (c) straight part
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Deformation of bellows due to bending moment (1/4 convolution)—(a) side view; (b) front view
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Column-type deformation of 1/2-bellows
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Definition of lateral displacements of bellows
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Creep deformation of bellows by FEM analysis (case 4-1, N=40)—(a) initial shape; (b) deformed shape
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Change of central displacement of bellows with time—(a) time versus W max (case 1-1∼-4), (b) time versus W max (case 2-1, -2), (c) time versus W max (case 3-1), (d) time versus W max (case 4-1)
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Comparison of critical times between FEM analysis and prediction
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Mitigation of thermal stresses in Z-shaped piping system by expansion joints
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Relation between bending moment and angular displacement (elastic follow-up behavior of bellows expansion joint)
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A simple elastic follow-up model with two bellows expansion joints
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Finite element mesh for FEM analysis of piping model
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Change of bending moment and angular displacement of no. 1 bellows expansion joint with time—(a) time versus nondimensional bending moment, (b) time versus nondimensional angular displacement
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Relation between nondimensional angular displacements and nondimensional bending moments of Nos. 1 and 2 bellows expansion joints (case 1)




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