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Publications
Li, RX., Chen, B.Q. and Guedes Soares, C. (2023), Design equation of buckle propagation pressure for pipe-in-pipe systems, Journal of Marine Science and Engineering, Vol. 11(3), 622
This paper focuses on the buckle propagation pressure of a pipe-in-pipe system under uniform external pressure. After the validation of the finite element model used in this research, several effects are studied. At first, the effects of the initial imperfection of the inner pipe, including the ovality and eccentricity, are checked out. Second, the influence of the scantling of the inner and outer pipes is tested. It is found the dominant factor which affects the buckle propagation mode is changeable. Then, the boundary value of the above factor is investigated by varying the ratio of the outer and inner diameters. Finally, after a summary of the calculation results, an empirical formula is proposed to illustrate the relationship between the buckle propagation pressure and the geometrical parameters of the pipe-in-pipe system. Utilizing this formula, the buckle propagation pressure of the pipe-in-pipe system can be estimated rapidly with good accuracy.
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