Autofrettage and Reautofrettage of a Spherical Pressure Vessel

[+] Author and Article Information
A. P. Parker

Defence Academy of the United Kingdom, University of Cranfield, Swindon, SN6 8LA, UKtony̱parker@tesco.net

X. Huang

School of Naval Architecture, Ocean and Civil Engineering, Shanghai JiaoTong University, Shanghai 200030, Chinaxphuang@sjtu.edu.cn

J. Pressure Vessel Technol 129(1), 83-88 (Mar 10, 2006) (6 pages) doi:10.1115/1.2389020 History: Received January 22, 2006; Revised March 10, 2006

There is a numerical procedure for modeling autofrettage of thick-walled cylinders that incorporates the Bauschinger effect as a function of prior plastic strain and Von Mises’ yield criterion. In this paper the numerical procedure is extended to solve the analogous problem of a spherical, thick walled steel vessel. An equivalent new analytical solution for the case of a spherical vessel is also formulated. The analytical and numerical solutions are shown to be in close agreement. It is demonstrated numerically that a reautofrettage procedure, previously proposed for cylindrical vessels, may be extremely beneficial for spherical vessels. Additional commentary is provided on the limitations of certain analytic solutions.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

General material tensile-compressive stress-strain curve

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Figure 2

Radii of elastic-plastic zones within the spherical vessel

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Figure 3

Residual stress distribution after initial autofrettage of A723 spherical vessel, radius ratio 2, 70% overstrain

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Figure 4

Residual stress distribution after initial autofrettage (AF1), second autofrettage (AF2), and third autofrettage (AF3) of the A723 spherical vessel, radius ratio 2, 70% overstrain

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Figure 5

Residual stress distribution after initial autofrettage of HB7 spherical vessel, radius ratio 2, 44% overstrain




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