Multiaxial Cyclic Ratcheting in Coiled Tubing—Part I: Theoretical Modeling

[+] Author and Article Information
Radovan Rolovic, Steven M. Tipton

Department of Mechanical Engineering, University of Tulsa, Tulsa, OK 74104

J. Eng. Mater. Technol 122(2), 157-161 (Sep 21, 1999) (5 pages) doi:10.1115/1.482781 History: Received November 19, 1998; Revised September 21, 1999
Copyright © 2000 by ASME
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Schematic layout drawing of coiled tubing deployment equipment
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Graphical representation of the new hardening rule
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Schematic illustration of anisotropic distortion of yield surface and the corresponding shift of the associated normal to the yield surface towards the loading direction
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Hardening parameter q as a function of the primary stress σP and ε̄e,accp
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Accumulated equivalent plastic strain as a function of the primary stress level change
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Parameters used to determine the plastic modulus in this study
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Tubing geometry and the orthogonal coordinate system for an element of coiled tubing (x—axial, h—hoop, and r—radial direction)




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