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A Study on the Residual Stress Evaluation of Autofrettaged SCM440 High Strength Steel  

Kim, Jae-Hoon (충남대학교 기계설계공학과)
Shim, Woo-Sung (충남대학교 기계설계공학과)
Yoon, Young-Kwen (충남대학교 기계설계공학과)
Lee, Young-Shin (충남대학교 기계설계공학과)
Cha, Ki-Up (국방과학연구소)
Hong, Suck-Kyun (국방과학연구소)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.14, no.4, 2010 , pp. 39-45 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. The purpose of the present paper is to predict the accurate residual stress of SCM440 high strength steel using the Kendall model which was adopted by ASME Code. Hydraulic pressure process was applied in the inner part and thick-walled cylinders were autofrettaged up to 30% overstrain levels. Electro polishing on the surface of autofrettage specimen was performed to get more accurate residual stress. Residual stresses were measured by X-ray diffraction method. The autofrettage surface which was plastically deformed analyzed using a scanning electron microscope(SEM). Although there were some differences in measured residual stress and numerical results, it has a tendency to agree comparatively with each other.
Keywords
Autofrettage; Thick-walled Cylinder; Residual Stress; Bauschinger Effect; Scanning Electron Microscope;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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