Mathematical Modeling of the Test Process of Construction Materials

Pirumyan, Narine; Stakyan, M. G.; Galstyan, Gagik

doi:10.4028/www.scientific.net/kem.828.115

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…The problem of controlling its complex modes and computer aided design is becoming more and more relevant every year. The solution to this problem requires the development of qualitatively new approaches to the analysis and synthesis of large systems with the most rational use of the capabilities of software tools [14,[16][17][18][19][20].…”

Section: Discussionmentioning

confidence: 99%

Mathematical modeling of gas flow distribution process in the gas transportation system of Armenia

Pirumyan

Stakyan

2021

E3S Web Conf.

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The issues of enhancement the methods of calculation and design of the gas transportation system (GTS) in the Republic of Armenia and the Republic of Artsakh are considered, taking into account the analysis of loading modes and the peculiarities of the system individual nodes’ operation. To calculate the pressure distribution at the nodal points and gas flows, the matrix method for determining the material balance equations for the linear-independent and nonlinear-independent contours of the gas pipeline circuit is used as a process mathematical model. On the energy conservation law basis, the balance capacities equation of gas supply sources and its consumption, distributed among the gas transmission network elements, is proposed. A mathematical model of the gas distribution process is obtained. Calculation methods that allow increasing the economic efficiency of GTS operation under optimal terms of GTS development are proposed.

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Section: Discussionmentioning

confidence: 99%

Mathematical modeling of gas flow distribution process in the gas transportation system of Armenia

Pirumyan

Stakyan

2021

E3S Web Conf.

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“…The coefficients ( 7) -( 9) are functions of N and σ, depending on the type of fatigue (small-, multicycle and long-term) and on the level of probability of failure-free operation Φ(z), which are not presented in the literature [20,21,22].…”

Section: Methodology For Corrosion-fatigue Processes Assessmentmentioning

confidence: 99%

Mathematical Modeling of the Process of Reduction of the Material Consumption of Gas Transmission System Elements

Pirumyan

Stakyan

Khazaryan³

2022

KEM

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The new method for a comprehensive assessment of the strength, durability and material capacity of the critical elements of the main gas pipelines, taking into account the combined impact of factors causing damage (environment, corrosion, random loading, geometry variation, material defects, etc.), which are changing the bearing capacity and material capacity of these structures, is proposed. As the main damaging factor, the process of corrosion fatigue is accepted, the qualitative and quantitative assessment of which are realized by applying a set of equations of comparable fatigue lines obtained by fatigue tests carried out in air and in corrosive environment. By the joint solution of these equations, the functions of the corrosion action coefficients are obtained in a wide range of cyclic strength and durability, which in standard calculation procedures are performed only for cyclic strength and only at the inflection point of the fatigue lines (NG 5  106 cycles).The issues of reducing the material consumption and ensuring the cost-effectiveness of structures, by using relatively cheap materials for pipelines - low-carbon and low-alloy structural steels subjected to surface hardening in stressed sections of pipes (edge welds) in order to significantly increase the physical and mechanical characteristics of the used steel grades are considered. In order to increase the corrosion resistance of these sections, contemporary polymer anticorrosive coatings are used.

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“…and corrosive environments, in fact, being a universal technology for increasing the corrosion-fatigue strength of these joints. Another important advantage of this technology is its implementation by mechanisms and devices that have a simple, reliable and portable construction that allows to strengthen the weld in the field, directly during welding operations and laying the GTS pipeline [21,22,23,24].…”

Section: Methods For Improving the Gts Welded Joints' Efficiencymentioning

confidence: 99%

“…Since the process of corrosion action is continuous, there are no physical limits of strength and endurance, which makes it necessary to determine their values to fix the service life of the structure in the interval of the durations of the loading cycles and to obtain the corresponding experimental functions. But as fatigue tests show, the gradient of these functions varies in the N interval, due to the different nature of the corrosion failure mechanism [8,9,10].…”

Section: Corrosion Phenomena In Gts Structural Elements' Materialsmentioning

confidence: 99%

“…The operating GTS network conditions are characterized by the internal gas pressure [11], which creates a static or variable stress state in the system, and a variable temperature regime (-45... +50 ° C), and climatic conditions of the region (topography, solar radiation, atmospheric pressure, wind, humidity, precipitation, etc. ), forming a natural corrosive environment, which can cause irreversible physical and chemical changes in the welded joint and base metal pipeline corrosion due to leakage, sorption, erosion and other processes, which ultimately lead to disease, loss of strength and structural failure [9,10,12,14].…”

Section: Structural Condition Defects and Damage Of The Pipelines' Welded Seam Metalmentioning

confidence: 99%

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The pipe material and improvement state analysis of technological processes for laying main gas pipelines

2021

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The change in the structural state of the gas pipes’ weld material at different seam cross-sections have been considered. The classification of external and internal defects of the joint material caused by the influence of different types of factors, most significant of which are the material defects in the transition zone of the joint to the pipe base metal. The analysis of atmospheric effects on the pipeline welds materials initiating adsorption and electrochemical processes in the metal microstructure that cause corrosion on the seam outer surface is given. Taking into account the non-stationary mode of pipes loading due to fluctuations in internal gas pressure, corrosion-fatigue damage is also added to these material defects, which cause the fatigue cracks development in the material, leading to a violation of the system tightness and even to welds destruction. The structure of a mobile device is proposed for performing a complex of technological operations for assembling large-diameter ground gas pipeline and for ensuring installation accuracy and maintenance processing of the welded pipes’ edges, automatic welding along the seam perimeter, cleaning, grinding and hardening of the seam material outer surface, applying a protective coating against atmospheric influences. The device facilitates the work of installation staff, increases the reliability and bearing capacity of the gas transmission system installed in difficult terrain.

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Mathematical Modeling of the Test Process of Construction Materials

Cited by 7 publications

References 4 publications

Mathematical modeling of gas flow distribution process in the gas transportation system of Armenia

Mathematical modeling of gas flow distribution process in the gas transportation system of Armenia

Mathematical Modeling of the Process of Reduction of the Material Consumption of Gas Transmission System Elements

The pipe material and improvement state analysis of technological processes for laying main gas pipelines

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