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• W4303438165 abstract "This paper proposes a novel approach to scrutinize the creep buckling of the super-heating pipes in boilers subjected to external pressure in high temperature environment. It is well known that once buckling occurs, cylindrical shells will collapse instantly. As the load carrying capability of the cylindrical shell decreases sharply upon the occurrence of the buckling, the proposed analysis is based on the consideration that the creep will have a significant influence on the material properties only in the pre-buckling stage. According to the creep aging theory, the influence of the creep deformation on the mechanical response of the super-heating pipes is defined by introducing two parameters--the reduced Young's modulus and the reduced Poisson's ratio. The nonlinear constitutive relation for creep deformation of the super-heating pipes in high-temperature environment is established based on the deformation theory in mechanics of plasticity. Governing equations for creep buckling of super-heating pipes in boilers are derived by considering the extra change of curvature due to the initial curvature of the super-heating pipes. MATLAB programs are developed based on the analytical expression for super-heating pipes with simply supported boundary conditions at the two ends and are tested against the available experimental results and the finite element prediction from ABAQUS software. It is found that the components of the creep strain caused by the stress at high temperature far exceeds those of the elastic strain. As a results of that, the creep buckling load of the super-heating pipes is much lower than its elastic buckling load. From this study, an explicit expression to compute the creep buckling load is provided which facilitates engineer to easily predict the residual life of the super-heating pipes at different servo temperature and servo time. • Two parameters--the reduced Young's modulus and the reduced Poisson's ratio is defined to demonstrate the influence of the creep deformation on the mechanical response of the super-heating pipes. • The nonlinear constitutive relation for creep deformation of the super-heating pipes in boilers in high-temperature environment is established. • The extra change of curvature as well as the bending moment due to the change in initial radius of the super-heating pipes is taken into consideration in the proposed model to derive the governing equations. • It is found that the buckling load of the super-heating pipes is greatly reduced once upon the occurrence of the creep deformation, even though the serve time is very short." @default.
• W4303438165 created "2022-10-07" @default.
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• W4303438165 date "2022-12-01" @default.
• W4303438165 modified "2023-10-18" @default.
• W4303438165 title "Creep buckling of long-term-serving super-heating pipes in boilers subjected to high temperature loading" @default.
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• W4303438165 doi "https://doi.org/10.1016/j.ijpvp.2022.104822" @default.
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