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- 검색키워드
- 저자 : Mosayeb Davoudi Kashkoli (검색결과 2 건)
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Mosayeb Davoudi Kashkoli,Khosro Naderan Tahan,Mohammad Zamani Nejad 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.32 No.6
Using firstfirst-order shear deformation theory (FSDT), a semi semi-analytical solution is employed to analyze creep damage and remaining life assessment of 304L austenitic stainless steel thick (304L ASS) cylindrical pressure vessels with variable thickness subjected to the temperature gradient and internal non non-uniform pressure. Damages are obtained in thick cylinder using RobinsonRobinson’s linear life fraction damage rule, and time to rupture and remaining life assessment is determined by Larson Larson-Miller Parameter (LMP). The thermo-elastic creep response of the material is described by Norton Norton’s law. The novelty of the present work is that it seeks to investigate creep damage and life assessment of the vessels with variable thickness made of 304L ASS using LMP based on first first-order shear deformation theory. A numerical solution using finite element method (FEM) is also presented and good agreement is found. It is shown that temperature gradient and non non-uniform pressure have significant influences on the creep damages and remaining li fe of the vessel vessel.
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Mosayeb Davoudi Kashkoli,Mohammad Zamani Nejad 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.28 No.3
This paper presents a semi-analytical solution for the creep analysis and life assessment of 304L austenitic stainless steel thick truncated conical shells using multilayered method based on the first order shear deformation theory (FSDT). The cone is subjected to the non-uniform internal pressure and temperature gradient. Damages are obtained in thick truncated conical shell using Robinson's linear life fraction damage rule, and time to rupture and remaining life assessment is determined by Larson-Miller Parameter (LMP). The creep response of the material is described by Norton's law. In the multilayer method, the truncated cone is divided into <i>n</i> homogeneous disks, and <i>n</i> sets of differential equations with constant coefficients. This set of equations is solved analytically by applying boundary and continuity conditions between the layers. The results obtained analytically have been compared with the numerical results of the finite element method. The results show that the multilayered method based on FSDT has an acceptable amount of accuracy when one wants to obtain radial displacement, radial, circumferential and shear stresses. It is shown that non-uniform pressure has significant influences on the creep damages and remaining life of the truncated cone.
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