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RESEARCH PAPERS

Re-Autofrettage

[+] Author and Article Information
Hamid Jahed1

Mechanical Engineering Department,  Iran University of Science & Technology, Tehran, Iran 16844hjahedmo@iust.ac.ir

Babak Ahmadi Moghadam

Fatigue & Fracture Laboratory, Mechanical Engineering Department,  Iran University of Science & Technology, Tehran, Iran 16844ba̱ahmadi@mail.iust.ac.ir

Mojtaba Shambooli

Fatigue & Fracture Laboratory, Mechanical Engineering Department,  Iran University of Science & Technology, Tehran, Iran 16844m̱shamboli@mail.iust.ac.ir

1

Currently, Associate Professor, Mechanical Engineering Department, University of Waterloo, 200 University Ave W., Waterloo, Ontario N2L 3G1, Canada; hjahedmo@uwaterloo.ca

J. Pressure Vessel Technol 128(2), 223-226 (Dec 07, 2005) (4 pages) doi:10.1115/1.2172619 History: Received November 07, 2005; Revised December 07, 2005

Loading, unloading, and reloading behavior of high-strength steel AISI 4340 (with yield strength of 1080MPa) has been measured using the round bar specimen and method described in (Jahad, H., and Ghanbari, G., 2003, ASME J. Pressure Vessel Technol., 125, pp. 321–325). Tests were conducted at plastic strains up to 3.4% for unloading and reloading. Re-autofrettage is the process of reapplication of overload pressure on an already autofrettaged tube. The question of whether reautofrettage results in a more beneficial compressive stress distribution and, therefore, in extension of life is examined in this study. Because of the profound influence of the Bauschinger effect on the unloading and reloading behavior of high-strength steel, the actual behavior of 4340 steel is used in calculations. It has been shown that with different combinations of first and second overload pressure, higher compressive stress is obtained as compared to a single autofrettage. Using a range of first and second autofrettage pressure, the compressive stress resulted by re-autofrettage is given.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Loading and unloading behavior of AISI 4340

Grahic Jump Location
Figure 2

Loading, unloading, and reloading behavior of AISI 4340

Grahic Jump Location
Figure 3

Re-autofrettage with same pressure and with low to high pressure

Grahic Jump Location
Figure 4

Re-autofrettage with high to low pressure

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