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RESEARCH PAPERS

Ratcheting Study of Pressurized Elbows Subjected to Reversed In-Plane Bending

[+] Author and Article Information
Xu Chen

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, Chinaxchen@tju.edu.cn

Bingjun Gao

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China and School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China

Gang Chen

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

J. Pressure Vessel Technol 128(4), 525-532 (Nov 10, 2005) (8 pages) doi:10.1115/1.2349562 History: Received February 23, 2005; Revised November 10, 2005

With a multi-axial test machine, ratcheting was studied experimentally for pressurized low carbon steel elbows under reversed bending. The maximum ratcheting strain occurred mainly in the hoop direction at flanks. Hoop ratcheting strain was found at intrados for individual specimen. No ratcheting strain was found at the extrados for all tests. Ratcheting strain rate grew with increase of the bending loading level at the same internal pressure or with an increase of internal pressure at the same bending load. Ratcheting simulation was performed by EPFEA with ANSYS in which Ohno-Wang and Chen-Jiao-Kim kinematic hardening rules were applied by user programing. By comparing with the experimental data, it is found that predicted results by the Chen-Jiao-Kim model simulates reasonably. Ratcheting boundary was determined by C-TDF method with the Chen-Jiao-Kim model.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus

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Figure 2

Setup of the experiment apparatus

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Figure 3

Strain gauge location pattern

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Figure 4

Loading spectrum: (a) pressure time history and (b) bending load time history

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Figure 5

Strain history: (a) at flanks and (b) at the intrados

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Figure 6

Principal ratcheting strain of E90L-2: (a) ratcheting strain at flank and (b) ratcheting strain at the intrados

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Figure 7

Cut cross section of EL90-2: (a) cutting of E90L-2 and (b) cross section of EL90-2

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Figure 8

Comparison of ratcheting strain

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Figure 9

Comparison of ratcheting strain

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Figure 10

Ratcheting strain with multi-step bending

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Figure 12

Determination of parameter mi in the Ohno-Wang model and uniaxial ratcheting prediction

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Figure 13

Prediction results by the Ohno-Wang model

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Figure 14

Determination of χi in the Chen-Jiao-Kim model and its ratcheting prediction

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Figure 15

Comparison of first principal ratcheting strain predicted by the Chen-Jiao-Kim model and experimental data: (a) under the same internal pressure and different bending loads; (b) under the same bending load and different internal pressures; and (c) under same internal pressure and multi-step bending load

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Figure 16

Ratcheting boundary

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