Vol. 8 є 1, 2018 p 79-83


Article name, authors, abstract and keyword


Numerical analysis of corroded structures with ANSYS APDL

Habib Berrekia a, Adel Chouiter a, Djebbara Benzerga a

a University of Science and Technology of Oran Mohamed Boudiaf, PO Box 1505, El Mnaouar, Bir El Djir 31000, Oran, Algeria

DOI: 10.28999/2541-9595-2018-8-1-79-83

Abstract: The large part of chemical fluids, especially natural gas and crude petroleum, transmits with pipelines. These pipelines manufactured with large pipes that they can bear high pressures about several thousand kilogram per cubic centimeter. Therefore, pipelines have to be safe. Utilization of old pipelines in operation increases probability of occurrence. The most important reasons of making these occurrences are the internal and external corrosions that are very effective in damaging gas pipelines, hence safety decreases. So, controlling of corrosion in gas pipelines needs to use cathodic protection with cathodic potential. Periodic inspections of pipelines are essential, through a method called pigging.
Algeria is one of the largest hydrocarbon producer and exporter in Africa, it has one of the largest gas pipeline systems in the world. Sonatrach has initiated in 2007 an ambitious integrity of its network management program. An important corollary of this program is the need to have reliable tools for evaluating the performance of each pipeline.
This work aims to propose a numerical analysis based finite element routine ANSYS, the behavior of a structure, if a pressure tube containing corrosion defects associated with metal losses. The verification of the validity of some rules of thumb about the acceptability of a crevasse is performed simultaneously.

Keywords: pipeline, mechanics of rupture, corrosion, structural analysis, finite element method, ANSYS, APDL.

Reference for citing:
Berrekia H., Chouiter A., Benzerga D. Numerical analysis of corroded structures with ANSYS APDL. Naukatekhnol. truboprov. transp. neftiinefteprod. = Science & Technologies: Oil and Oil Products Pipeline Transportation. 2018;8(1):79Ц83.

[1] Lee Y. K., Kim Y. P., Moon M.-W., Bang W. H., Oh K. H., Kim W.-S. The Prediction of Failure Pressure of Gas Pipeline with Multi Corroded Region. Materials Science Forum. Trans Tech Publications, 2005. Vols. 475Ц479, p. 3323Ц3326.
[2] Oh C. K., Kim Y. J., Baek J. H, KimW.-S. Ductile Failure Analysis of API X65 pipes with Notch-Type Defects using a Local Fracture Criterion. Int. Journal of Pressure Vessels and Piping. 2007;84(8):512Ц525.
[3] Netto T. A., Ferraz U. S., Estefen S. F. The Effect of Corrosion Defects on the Burst Pressure of Pipelines. Journal of Constructional Steel Research. 2005;61(8):1185Ц1204.
[4] Gurson A. L. Continuum Theory of Ductile Rupture by Void Nucleation and Growth. Part 1. Ц Yield Criteria and Flow Rules for Porous Ductile Media. Journal of engineering materials and technology. 1977;99:2Ц15.
[5] Rice J. R., Tracey D. ћ. On the Ductile Enlargement of Voids In Triaxial Stress Fields. Journal of the Mechanics of Physics of Solids. 1969;17:201Ц217.
[6] Lemaitre J. A. Continuous Damage Mechanics Model for Ductile Fracture. Journal of Engineering Material and Technology. 1985;107:83Ц89.
[7] Hancock J. W., Mackenzie A. C. On The Mechanisms Of Ductile Failure In High-Strength Steels Subjected To Multi-Axial Stress-States. Journal of the Mechanics of Physics of Solids. 1976;24:147Ц169.
[8] Oh C. K., Kim Y. J., Baek J. H., Kim Y. P., Kim W.-S. A phenomenological Model of Ductile Fracture for API X65 Steel. Int. Journal of Mechanical Sciences. 2007;49:1399Ц1412.
[9] Karami M. Review of Corrosion Role in Gas Pipeline and Some Methods for Preventing It. Journal of Pressure Vessel Technology. 2012;134(5):054501.
[10] Kishawy H. A., Gabbar H. A. Review of Pipeline Integrity Management Practices. Int. J. Pressure Vessels Piping. 2010;87:373Ц380.
[11] Roche M. Corrosion Management: A Key Issue in Pipeline Integrity. Proceedings of International Petroleum Technology held 4Ц6 December 2007, Dubai, United Arab Emirates.