Effect of Internal Pressure and Dent Depth on Strain Distribution of Pressurized Pipe Subjected to Indentation

Abstract:

A dent in a pipeline is a permanent plastic deformation of the circular cross section of the pipe. This paper discusses numerical results obtained from finite element (FE) simulation of pressurized pipe subjected to radial denting by a rigid indenter. Dent produced by rectangular shape indenter is assessed and the strain distribution of the pipe is investigated. The effect of internal pressure and dent depth on the distribution of strain is also studied. The results show that the circumferential and longitudinal strains increase with increasing the internal pressure and the depth of the dent. Numerical results are compared with an empirical theoretical model in order to demonstrate the accuracy of the analysis.

• Periodical: Applied Mechanics and Materials (Volume 376)
• Pages: 135-139
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.376.135
• Online since: August 2013
• Authors: Maziar Ramezani, Thomas Rainer Neitzert
• Keywords: Finite Element (FE) Simulation, Indentation, Internal Pressure, Pipe

References

[1] Baek, J. -H., Kim, Y. -P., Kim, W. -S., Koo, J. -M., Seok, C. -S. (2012) Load bearing capacity of API X65 pipe with dent defect under internal pressure and in-plane bending. Materials Science and Engineering A 540 , pp.70-82.

DOI: 10.1016/j.msea.2012.01.078

[2] Błachut, J., Iflefel, I.B. (2008).

[3] Błachut, J., Iflefel, I.B. (2011) Analysis of pipes containing plain and gouged dents. Strain 47 (SUPPL. 1) , pp. e34-e51.

DOI: 10.1111/j.1475-1305.2008.00478.x

[4] Cosham, A., Hopkins, P. (2004) The effect of dents in pipelines - Guidance in the pipeline defect assessment manual. International Journal of Pressure Vessels and Piping 81 (2) , pp.127-139.

DOI: 10.1016/j.ijpvp.2003.11.004

[5] Hyde, T.H., Luo, R., Becker, A.A. (2005) Elastic-plastic response of unpressurised pipes subjected to axially-long radial indentation. International Journal of Mechanical Sciences 47 (12) , p.1949-(1971).

DOI: 10.1016/j.ijmecsci.2005.07.004

[6] Hyde, T.H., Luo, R., Becker, A.A. (2007) Elastic-plastic analysis of offset indentations on unpressurised pipes. International Journal of Solids and Structures 44 (2) , pp.399-418.

DOI: 10.1016/j.ijsolstr.2006.04.040

[7] Iflefel, I.B., Moffat, D.G., Mistry, J. (2005) The interaction of pressure and bending on a dented pipe. International Journal of Pressure Vessels and Piping 82 (10) , pp.761-769.

DOI: 10.1016/j.ijpvp.2005.06.002

[8] Jiao, Z. -L., Shuai, J. (2011) Integrity assessment of pipeline with dents. Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University 33 (4) , pp.157-164.

[9] Lancaster, E.R., Palmer, S.C. (1994) Experimental study of strains caused by pressurisation of pipes with dents. Proceedings of the International Offshore and Polar Engineering Conference 2 , pp.110-117.

[10] Liu, J.H., Francis, A. (2004) Theoretical analysis of local indentation on pressured pipes. International Journal of Pressure Vessels and Piping 81 (12) , pp.931-939.

DOI: 10.1016/j.ijpvp.2004.05.007

[11] Maxey, W.A. (1986) Outside force defect behaviour. Seventh Symposium on Linepipe research, paper 14 (American Gas Association, Houston, Texas).

[12] Orynyak, I.V., Shlapak, L.S. (2001) Estimation of ultimate pressure for a pipe with a dent. Problemy Prochnosti (5) , pp.101-110.