Determining the influence of an artificial defect on the mechanical properties of a flexible pipeline material during a rupture test

Authors

DOI:

https://doi.org/10.15587/1729-4061.2023.291877

Keywords:

pressure fire hose, flexible pipeline, normal elasticity, longitudinal stiffness of the material, artificial defect

Abstract

The object of research is the phenomenon of influence of hidden defects on the mechanical properties of the material of flexible pipelines. T-type pressure fire hoses with an inner diameter of 77 mm were used as test samples of flexible pipelines. During the operation of pressurized fire hydrants and their laying on vertical surfaces, they are subjected to significant bursting pressures in their longitudinal direction. That is, such operating modes of the sleeve may occur during its operation. The research was carried out on the FP 100/1 bursting machine, in which the test samples were fixed.

The dependence of the stiffness and normal elasticity of the material of the flexible pipeline on the depth and length of the artificial defect when testing it for breaking has been established. With an artificial defect depth of 0.2 mm and its length from 0 to 40 mm, the stiffness of the flexible pipeline material decreases from 573.812 kN/m to 478.276 kN/m. With the indicated values of the defect, the normal elasticity ranged from 86.46 MPa to 64.567 MPa. When the depth of the defect increases by 0.4 mm, the stiffness of the sleeve material decreases to 432.902 kN/m, and the normal elasticity decreases to 58.442 MPa.

The obtained results are explained by the fact that when the thickness of the threads of the base of the power frame is reduced by 33 %, the longitudinal stiffness and normal elasticity of the material of the flexible pipeline are reduced by 25 % and 26 %, respectively.

The results of these studies are needed in practice because they can make it possible to develop new or improve existing methods of detecting hidden defects in the material from which flexible pipelines are made

Author Biographies

Sergii Nazarenko, National University of Civil Defence of Ukraine

PhD, Associate Professor

Department of Engineering and Rescue Machinery

Roman Kovalenko, National University of Civil Defence of Ukraine

PhD

Department of Engineering and Rescue Machinery

Andrii Kalynovskyi, National University of Civil Defence of Ukraine

PhD, Associate Professor

Department of Engineering and Rescue Machinery

Andrii Pobidash, National University of Civil Defence of Ukraine

PhD, Senior Researcher

Academic Secretary

Volodymyr Nazarenko, Main Department of the State Emergency Service of Ukraine in the Kharkiv Region

Head of Department

Yevheniia Kravchenko, Main Department of the State Emergency Service of Ukraine in the Kharkiv Region

Specialist

Olga Shoman, National Technical University "Kharkiv Polytechnic Institute"

Doctor of Technical Sciences, Professor

Department of Geometrical Modeling and Computer Graphics

Volodymyr Danylenko, National Technical University "Kharkiv Polytechnic Institute"

Associate Professor

Department of Geometrical Modeling and Computer Graphics

Olena Sydorenko, National Technical University "Kharkiv Polytechnic Institute"

PhD

Department of Geometrical Modeling and Computer Graphics

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Determining the influence of an artificial defect on the mechanical properties of a flexible pipeline material during a rupture test

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Published

2023-12-14

How to Cite

Nazarenko, S., Kovalenko, R., Kalynovskyi, A., Pobidash, A., Nazarenko, V., Kravchenko, Y., Shoman, O., Danylenko, V., & Sydorenko, O. (2023). Determining the influence of an artificial defect on the mechanical properties of a flexible pipeline material during a rupture test. Eastern-European Journal of Enterprise Technologies, 6(1 (126), 29–37. https://doi.org/10.15587/1729-4061.2023.291877

Issue

Vol. 6 No. 1 (126) (2023): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2023 Sergii Nazarenko, Roman Kovalenko, Andrii Kalynovskyi, Andrii Pobidash, Volodymyr Nazarenko, Yevheniia Kravchenko, Olga Shoman, Volodymyr Danylenko, Olena Sydorenko

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