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Residual stress analysis of autofrettaged thick-walled spherical pressure vessel

Maleki, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijpvp.2010.04.002
  3. Publisher: 2010
  4. Abstract:
  5. In this study, residual stress distributions in autofrettaged homogenous spherical pressure vessels subjected to different autofrettage pressures are evaluated. Results are obtained by developing an extension of variable material properties (VMP) method. The modification makes VMP method applicable for analyses of spherical vessels based on actual material behavior both in loading and unloading and considering variable Bauschinger effect. The residual stresses determined by employing finite element method are compared with VMP results and it is demonstrated that the using of simplified material models can cause significant error in estimation of hoop residual stress, especially near the inner surface of the vessel. By performing a parametric study, the optimum autofrettage pressure and corresponding autofrettage percent for creating desirable residual stress state are introduced and determined
  6. Keywords:
  7. Extended variable material properties method ; Autofrettage ; Bauschinger effects ; Inner surfaces ; Loading and unloading ; Material behavior ; Material models ; Optimum autofrettage pressure ; Parametric study ; Residual stress distributions ; Residual stress state ; Spherical pressure vessel ; Spherical vessels ; Thick-walled spherical pressure vessels ; Variable material property ; VMP method ; Boilers ; Caissons ; Materials properties ; Pressure vessels ; Residual stresses ; Spheres ; Stress analysis ; Stress concentration ; Unloading ; Finite element method
  8. Source: International Journal of Pressure Vessels and Piping ; Volume 87, Issue 7 , July , 2010 , Pages 396-401 ; 03080161 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0308016110000748?np=y&npKey=7c5147802219ed1b77f7379ac5447d4a2c961cd5a0a09e0a1a6bc36d877adcc6