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Research Papers: Operations, Applications and Components

Thermal Aging Effect on the Ratcheting Behavior of Pressurized Elbow Pipe

[+] Author and Article Information
Caiming Liu, Dunji Yu, Waseem Akram

School of Chemical Engineering
and Technology,
Tianjin University,
Tianjin 300072, China

Xu Chen

Mem. ASME
School of Chemical Engineering
and Technology,
Tianjin University,
Tianjin 300072, China
e-mail: xchen@tju.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 5, 2017; final manuscript received December 30, 2017; published online February 22, 2018. Assoc. Editor: Akira Maekawa.

J. Pressure Vessel Technol 140(2), 021604 (Feb 22, 2018) (9 pages) Paper No: PVT-17-1199; doi: 10.1115/1.4039073 History: Received October 05, 2017; Revised December 30, 2017

In this study, the ratcheting behaviors of pressurized Z2CN18.10 austenitic stainless steel elbow pipe influenced by the thermal aging process were experimentally investigated in controlled constant internal pressure and reversed in-plane bending after different thermal aging periods (1000 h and 2000 h) at thermal aging temperature of 500 °C. It is shown that the ratcheting behavior of pressured elbow pipe is highly affected by the thermal aging process. The evaluation of ratcheting behavior of pressured elbow pipe was performed using Chen–Jiao–Kim (CJK) kinematic hardening model as a user subroutine of ANSYS. The relationships of yield stress σs and multiaxial parameter χ with thermal aging time were proposed. Ratcheting shakedown boundary of aged elbow pipe was evaluated by CJK model with thermal aging time.

Copyright © 2018 by ASME
Topics: Pipes
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Figures

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Fig. 5

Uniaxial tensile specimen specification cut from elbow pipe and uniaxial tensile curves of Z2CN18.10 austenitic stainless steel after different thermal aging time, (a) uniaxial tensile specimen specification and (b) uniaxial tensile curves

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Fig. 4

Arrangement of strain gauge location

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Fig. 3

Thermal aging process

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Fig. 2

Experimental setup

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Fig. 6

Evolutions of the initial 20 hysteresis loops at extrados (180 deg) of original elbow pipe specimen, (a) hoop and (b) axial

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Fig. 7

The 1st, 5th, 10th, 20th, 50th, and 100th hysteresis loops at extrados (180 deg) of original elbow pipe specimen, (a) hoop and (b) axial

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Fig. 10

Evolutions of the hoop ratcheting strains of aged elbow pipe specimen after different aging period at 1000 h and 2000 h with the same thermal aging temperature of 500 °C and original specimen at intrados (0 deg), 45 deg, 90 deg, and 135 deg, (a) intrados (0 deg), (b) 45 deg, (c) 90 deg, and (d)135 deg

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Fig. 13

The comparison of the experimental data and the predicted results of elbow pipes at intrados (0 deg) by CJK model

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Fig. 8

Ratcheting strains of original elbow pipe specimen at intrados (0 deg), 45 deg, 90 deg, 135 deg, and extrados (180 deg), (a) axial and (b) hoop

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Fig. 9

Ratcheting strains of aged elbow pipe specimen at different Locations, (a) 1000 h and (b) 2000 h

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Fig. 14

Relationships of σs and χ as a function of thermal aging time, h

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Fig. 1

Shape and geometries of elbow pipe specimen

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Fig. 15

Ratcheting shakedown boundary of elbow pipes at intrados (0 deg)

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Fig. 11

Finite element model and load conditions of elbow pipe (a) finite element model and (b) load conditions

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Fig. 12

Simulation results of uniaxial tension curves of Z2CN18.10 austenitic stainless steel at different thermal aging periods

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