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자긴가공된 SCM440 고강도강의 잔류응력평가에 관한 연구
김재훈(Jaehoon Kim),심우성(Woosung Shim),윤용근(Youngkwen Yoon),이영신(Youngshin Lee),차기업(Kiup Cha),홍석균(Suckkyun Hong) 한국추진공학회 2010 한국추진공학회지 Vol.14 No.4
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.