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A Study on Residual Stress Analysis of Autofrettaged Thick-walled Cylinders  

Kim, Jae-Hoon (Department of Mechanical Design Engineering, Chungnam National Univ.)
Shim, Woo-Sung (Department of Mechanical Design Engineering, Chungnam National Univ.)
Lee, Young-Shin (Department of Mechanical Design Engineering, Chungnam National Univ.)
Cha, Ki-Up (Propulsive Group, Agency of Defense Development)
Hong, Suck-Kyun (Propulsive Group, Agency of Defense Development)
Publication Information
Journal of the Korean Society for Precision Engineering / v.26, no.12, 2009 , pp. 110-116 More about this Journal
Abstract
Thick-walled cylinders, such as a cannon or nuclear reactor, are autofrettaged to induce advantageous residual stresses into pressure vessels and to increase operating pressure and the fatigue lifetimes. As the autofrettage level increases, the magnitude of compressive residual stress at the bore also increases. However, the Bauschinger effect reduces the compressive residual stresses as a result of prior tensile plastic strain, and decreases the beneficial autofrettage effect. The purpose of the present paper is to predict the accurate residual stress of SNCM8 high strength steel using the Kendall model which was adopted by ASME Code. The uniaxial Bauschinger effect test was performed to decide BEF, then this constant was used in calculation. There were some differences between theoretical solution and modified solution.
Keywords
Autofrettage; Residual Stress; Bauschinger Effect; Tangential Residual Stress;
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