Analysis of a Longitudinal Crack in a Pipeline Loaded with a Certain Internal Pressure, with Recommendations for Further Operation

Abstract:

In fracture mechanics, there is a rather complex theory associated mainly with the choice of model and the correct choice of fracture criteria. There may be models and criteria for the fracture mechanics of bodies with stable and unstable properties, or the choice of a fracture model for an viscoelastic material. When calculating, you can choose the critical crack opening criterion or the local energy criterion. But in practice, it is possible to carry out more simplified initial theoretical calculations, which can be performed by an engineer who has the necessary theoretical knowledge and practical experience, for example, in the operation of pipelines. If the material is considered completely solid, then the interatomic bonds are destroyed. On this basis, the theoretical strength limit of the material is introduced. In this article we study normal tensile cracks, since this is the most dangerous situation (when the tensile stress is perpendicular to the plane of the crack). The main goal is to reduce a real crack detected on an object to simple standard solutions. That is, to imagine it as a crack that has a solution. This means that we must calculate the load with a margin and all our assumptions must be related to the safety margin. In reality, cracks are the most unpredictable (unpredictable shape, unpredictable location).

• Periodical: Engineering Headway (Volume 7)
• Pages: 3-9
• DOI: https://doi.org/10.4028/p-cYX97i
• Online since: April 2024
• Authors: Shahid Yusubov*
• Keywords: Crack Resistance, Mechanical Characteristic, Stress Intensity Factor

References

[1] Y. Murakami, Stress Intensity Factors Handbook, third edition, (1999)

[2] V.M. Pestrikov, E.M. Morozov, Fracture Mechanics of Solids, Textbook for Universities, (2002)

[3] Zakharov M.N., Lukyanov V.A. Strength of vessels and pipelines with wall defects in oil and gas production, State University of Oil and Gas, National Research University, named after I.M. Gubkin, Moscow (2000)

DOI: 10.32758/2071-5951-2021-0-3-50-56

[4] Vansovich K. A., Yadrov V. I., Beseliya D. S. The Effect of Stress State Characteristics on the Surface Fatigue Cracks Growth Rate Taking into Account Plastic Deformations // Procedia Engineering. 2015. Vol. 113. P. 244-253. DOI: 10.1016/j. proeng.2015.07.329.

DOI: 10.1016/j.proeng.2015.07.329

[5] Terfas O., Alaktiwi A. Ductile Crack Grows in Surface Cracked Pressure Vessels // International Journal of Mechanical, Aerospace, Industrial, Mechatronic and Manufacturing Engineering. 2013. Vol. 7, no. 1. P. 46-52.

[6] Shiratori, T. Computational fracture mechanics / T. Shiratori, T. Miyoshi, H. Matsushita. – M.: Publishing House Mir, 1986. – 334 p.

[7] Murzakhanov G.Kh. Diagnostics of the technical condition and assessment of the residual life of main pipelines. Moscow, Publishing House of the Independent Institute of Oil and Gas, 2005, 70 p.

[8] GOST 25.506 – 85 Methods of mechanical testing of metals. Determination of crack resistance characteristics (fracture toughness) under static loading. – M.: Standards Publishing House, 1985. – 63 p.

[9] Vansovich K. A., Aistov I. P., Beselia D. S. Method for assessing the residual life of a main oil pipeline in the presence of a surface crack under operating loads // Engineering journal: science and innovation. 2018. No. 5 (77). pp.1-7. B01:.

DOI: 10.18698/2308-6033-2018-5-1759

[10] Pluvinage G., Bouledroy O., Hadj-Meliani M. Assessing the danger of corrosion defects using a diagram for assessing areas of destruction // Science and technology of pipeline transport of oil and petroleum products. 2018. No. 4. pp.384-396. BOT:.

DOI: 10.28999/2541-9595-2018-8-4-384-396

[11] Main oil pipelines and petroleum product pipelines. Determination of the strength and durability of pipes and welded joints with defects: RD-23.040.00-KTN-115-11: approved. 07/10/2011: effective from 08/10/2011. M.: OA UAC Transneft, 2011. 143 p.