Ratcheting Effect of Pressurized 90° Elbow Pipe under In-Plane Opening, Closing, and Reverse Bending
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 10, Issue 2
Abstract
The effect of opening-bending, closing-bending, and reversed-bending loads on the ratcheting behavior of pressurized Z2CND18.12N stainless steel 90° long-radius elbow pipe was studied using finite-element (FE) analysis. Three-dimensional elastoplastic analyses with the Chen-Jiao-Kim (CJK) kinematic hardening model, implemented in the FE software ANSYS, was used to simulate the ratcheting behavior of pressurized 90° elbow pipe at flanks and intrados. The results indicated that ratcheting strain for single-step loading increased with increasing bending loading at the same internal pressure and that it increased with increasing internal pressure at the same bending loading. Multistep bending revealed that the ratcheting rate increased with increasing loading but decreased or even vanished at a lower bending level imposed after a higher bending level. Furthermore, the results generally indicated that the ratcheting strain of a 90° elbow pipe subjected to in-plane opening-bending and closing-bending loads was larger than that with a reversed-bending load.
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Acknowledgments
The author gratefully acknowledges financial support for this work from the China Postdoctoral Science Foundation (No. 2017M610171), the Natural Science Foundation of Hebei Province of China (No. E2018501022), the Doctoral Scientific Research Foundation of Liaoning Province (No. 201601017), and the Fundamental Research Funds for the Central Universities (No. N162303001).
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 10 • Issue 2 • May 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 20, 2018
Accepted: Sep 26, 2018
Published online: Jan 30, 2019
Published in print: May 1, 2019
Discussion open until: Jun 30, 2019
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