Study on the characteristics of pipe buckling strength under pure bending and external stress using nonlinear finite element analysis

Hartono Yudo; Wilma Amiruddin; Ari Wibawa Budi Santosa; Ocid Mursid; Tri Admono; Hartono Yudo; Wilma Amiruddin; Ari Wibawa Budi Santosa; Ocid Mursid; Tri Admono

doi:10.14203/j.mev.2021.v12.110-116

Study on the characteristics of pipe buckling strength under pure bending and external stress using nonlinear finite element analysis

Hartono Yudo, Wilma Amiruddin, Ari Wibawa Budi Santosa, Ocid Mursid, Tri Admono

Abstract

Buckling and collapse are important failure modes for laying and operating conditions in a subsea position. The pipe will be subjected to various kinds of loads, i.e., bending moment, external pressure, and tension. Nonlinear finite element analysis was used to analyze the buckling strength of the pipe under pure bending and external pressure. The buckling of elastic and elasto-plastic materials was also studied in this work. The buckling strength due to external pressure had decreased and become constant on the long pipe when the length-to-diameter ratio (L/D) was increased. The non-dimensional parameter (β), which is proportionate to (D/t) (σ_y/E), is used to study the yielding influence on the buckling strength of pipe under combined bending and external pressure loading. The interaction curves of the buckling strength of pipe were obtained, with various the diameter-to-thickness ratio (D/t) under combination loads of external pressure and bending moment. For straight pipes L/D = 2.5 to 40, D = 1000 to 4000 mm, and D/t = 50 to 200 were set. The curved pipes D/t = 200, L/D =2.5 to 30 have been investigated by changing the radius of curvature-to-diameter ratio (R/D) from 50 to ∞, for each one. With decreasing R/D, the buckling strength under external pressure decreases slightly. This is in contrast to the bending of a curved pipe. When the value of R/D was decreased, the flexibility of the pipe was increased. However, the buckling strength of the pipe during bending was decreased due to the oval deformation at the cross-section.

10.14203/j.mev.2021.v12.110-116

Keywords

buckling strength; elastic buckling; elasto-plastic buckling; bending moment; external pressure

Full Text:

PDF

References

S. Kyriakides and J. G.T., “Bifurcation and localization instabilities in cylindrical shells under bending—I. Experiments,” Int. J. Solids Struct., vol. 29, no. 9, pp. 1117–1142, Jan. 1992.

M. Elchalakani, X. L. Zhao, and R. H. Grzebieta, “Plastic mechanism analysis of circular tubes under pure bending,” Int. J. Mech. Sci., vol. 44, no. 6, pp. 1117–1143, Jun. 2002.

H. Yudo and T. Yoshikawa, “Mechanical behaviour of pipe under pure bending load,” in Proceedings of the 26th Asian technical exchange and advisory meeting on marine structures, 2012, pp. 359–364.

H. Yudo and T. Yoshikawa, “Buckling phenomenon for straight and curved pipe under pure bending,” J. Mar. Sci. Technol., vol. 20, no. 1, pp. 94–103, 2015.

H. Karampour, F. Albermani, and M. Veidt, “Buckle interaction in deep subsea pipelines,” Thin-Walled Struct., vol. 72, pp. 113–120, Nov. 2013.

Z. Li, C. An, and M. Duan, “An analytical approach for elastic and non-elastic buckling of pipes under external/internal pressures,” Ocean Eng., vol. 187, p. 106160, Sep. 2019.

C. Basaglia, D. Camotim, and N. Silvestre, “GBT-based buckling analysis of steel cylindrical shells under combinations of compression and external pressure,” Thin-Walled Struct., vol. 144, p. 106274, Nov. 2019.

S. Gong, B. Sun, S. Bao, and Y. Bai, “Buckle propagation of offshore pipelines under external pressure,” Mar. Struct., vol. 29, no. 1, pp. 115–130, Dec. 2012.

A. Binazir, H. Karampour, B. P. Gilbert, and H. Guan, “Bending capacity of pipe-in-pipe systems subjected to external pressure,” in ACMSM25, Springer, pp. 657–666, 2020.

M. Alrsai, H. Karampour, and F. Albermani, “Numerical study and parametric analysis of the propagation buckling behaviour of subsea pipe-in-pipe systems,” Thin-Walled Struct., vol. 125, pp. 119–128, Apr. 2018.

Y. Chen et al., “Local buckling of dented subsea pipelines under the combined loadings,” ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. Aug. 03, 2020.

S. Yan, X. Shen, H. Ye, Z. Chen, X. He, and Z. Jin, “On the collapse failure of dented pipes under bending moment and external pressure,” in OCEANS 2016 MTS/IEEE Monterey, pp. 1–5, 2016.

A.C. Nogueira, “Rationally modeling collapse due to bending and external pressure in pipelines,” Earthquakes and Structures, 3(3_4), pp. 473-494, 2012.

Jr, W. C. Loureiro and I.P. Pasqualino, “Numerical-analytical prediction of the collapse of flexible pipes under bending and external pressure,” International Conference on Offshore Mechanics and Arctic Engineering, Vol. 44908, pp. 353-359. American Society of Mechanical Engineers, July 2012.

T. G. Ghazijahani, and H. Showkati, “Experiments on cylindrical shells under pure bending and external pressure,” Journal of Constructional Steel Research, 88, pp. 109-122, 2013.