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Publications
Li, RX., Chen, B.Q. and Guedes Soares, C. (2021), “Design equation for the effect of ovality on the collapse strength of sandwich pipes”, Ocean Engineering, Vol. 235, 109367 (11 pages)
This research focuses on the effect of ovality on the collapse strength of subsea sandwich pipes under external pressure. About 600 finite element analyses are performed to obtain the collapse strength of sandwich pipes with different geometrical parameters. Given the complicated geometrical characteristics of the two individual pipes and the core layer, three parameters are selected to express the geometrical features of sandwich pipes: (1) the ratio between the radius of outer and inner pipes, (2) the radius-thickness ratio of the outer pipe, and (3) the radius-thickness ratio of the inner pipe. Considering different values of radius-thickness ratios and ovalities of outer and inner pipes, four series of calculations are performed. By summarizing the obtained results, a simplified equation, combining with two supplementary equations, is derived to describe the relationship between the collapse strength and the geometrical parameters of sandwich pipes. Good agreement is achieved between the calculation results and the proposed design equation. With the help of the proposed simplified equation, it is revealed that under external pressure the inner pipe contributes more to the strength of sandwich pipes than the outer pipe.
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