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On the material modeling of the autofrettaged pressure vessel steels
, Article Journal of Pressure Vessel Technology, Transactions of the ASME ; Volume 131, Issue 5 , 2009 ; 00949930 (ISSN) ; Hosseinian, E ; Assempour, A ; Sharif University of Technology
2009
Abstract
Material modeling of high strength steels plays an important role in the accurate analysis of autofrettaged tubes. Although, the loading behavior of such materials is nearly elasticperfectly plastic, their unloading behavior due to Bauschinger effect is very complicated. DIN1.6959 steel is frequently used for construction of autofrettaged tubes in some countries such as Germany and Switzerland. In spite of similarity between chemical compositions of this steel with that of A723 steel, due to different material processing, these two steels have an unlikely behavior. In this paper the material behavior of DIN1.6959 was accurately modeled by uniaxial tension-compression test results. Both 6 mm...
On the material modeling of the autofrettaged pressure vessel steels
, Article ASME 2008 Pressure Vessels and Piping Conference, PVP2008, Chicago, IL, 27 July 2008 through 31 July 2008 ; Volume 5 , July , 2008 , Pages 63-70 ; 0277027X (ISSN); 9780791848289 (ISBN) ; Hosseinian, E ; Assempour, A ; Pressure Vessels and Piping ; Sharif University of Technology
2008
Abstract
Material modeling of the high strength steels plays an important role in accurate analysis of autofrettaged tubes. Although, the loading behavior of such materials is nearly elastic-perfectly plastic, their unloading behavior due to Bauschinger effect is very complicated. DIN1.6959 steel is frequently used for construction of autofrettaged tubes in some countries such as Germany and Switzerland. In spite of similarity between chemical compositions of this steel with A723 steel, due to different material processing, two steels have unlikely behavior. In this paper material behavior of DIN1.6959 has been accurately modeled by uniaxial tension-compression test results. Both 6 mm and 12.5 mm...
Computational modeling of the transverse-isotropic elastic properties of single-walled carbon nanotubes
, Article Computational Materials Science ; Volume 49, Issue 3 , 2010 , Pages 544-551 ; 09270256 (ISSN) ; Sadeghi, M ; Naghdabadi, R ; Rafii-Tabar, H ; Sharif University of Technology
2010
Abstract
Various experimental and theoretical investigations have been carried out to determine the elastic properties of nanotubes in the axial direction. Their behavior in transverse directions, however, has not been well studied. In this paper, a combination of molecular dynamics (MD) and continuum-based elasticity model is used to predict the transverse-isotropic elastic properties of single-walled carbon nanotubes (SWCNTs). From this modeling study, five independent elastic constants of an SWCNT in transverse directions are obtained by analyzing its deformations under four different loading conditions, namely, axial tension, torsion, uniform and non-uniform radial pressure. To find the elastic...