Abstract
This study deals with the upheaval thermal buckling of functionally graded subsea pipeline subjected to thermal loadings. The temperature-dependent material properties of the functionally graded subsea pipeline are considered, which distribute through the cross-section of the pipe. The governing equations of the functionally graded subsea pipeline are derived by using the nonlinear von-Kármán assumption and Euler-Bernoulli beam theory. An accurate analytical solution is derived to evaluate the thermal post-buckling response. The proposed mathematical model is verified by comparing it with the results in the literature. Numerical results are provided to explore the influences of the temperature-dependent material properties and the volume fraction exponent. The results show that the temperature-dependent material property of the thermal expansion coefficient has a great influence on the upheaval thermal buckling behavior. In addition, both the minimum critical temperature and the maximum stress will reduce when the functionally graded subsea pipeline is employed. Thus, the functionally graded materials have potential application to the subsea pipeline transporting high-temperature oil and gas.
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