Effects of Defect Shapes on Stress of High-Strength Steel Pipe Using FSI Method

Abstract:

High-strength steel pipes have excellent strength but have poor fracture arrest. By finite-element analysis involving fluid-structure interaction (FSI) method, models of high-strength steel pipe with three kinds of defects (triangle, rectangle and semi-ellipse) were built to determine the concentrated stress based on the working conditions of X70 pipelines in the West-to-East Natural Gas Transmission Project, and the simulation results were compared with the field test results measured by an X-ray stress analyzer. With the same defect width (2 mm), the triangular defect (40°) had a greater influence on the concentrated stress in the pipe than rectangular and semi-elliptic defects. The results can be taken as references of the damage failure process of the defect in pipes in operating conditions as well as a theoretical basis for the fracture arrest of pipes in field operation.

• Periodical: Applied Mechanics and Materials (Volume 577)
• Pages: 154-157
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.577.154
• Online since: July 2014
• Authors: Yue Cui*, Hui Qing Lan, Zhao Hui Zhang, Nan Lin, Yong Ping Du
• Keywords: Defect Shape, Fluid Structure Interaction (FSI), High Strength Steel (HSS), Pipe, Stress

References

[1] D. P. Fairchild. W. J. Sisak and C. W. Petersen: Welded Pipe and Tube Vol. 29 (2006), p: 27.

[2] K. Shiozawa and L. Lu: Key Engineering Materials Vol. 378 (2008), p: 65.

[3] G. Cheng, Y. Cai and H. Zang: Machinery Design & Manufacture. Vol. 5 (2012), p: 87.

[4] American Petroleum Institute. Specification for line pipe. (2007).

[5] S. Nesic: Corrosion Science Vol. 49 (2007), p: 4308.