Mathematical Modeling of Process of the Friction Stir Welding

Rzaev, R.A.; Dzhalmukhambetov, Azat; Chularis, A. A.; Valisheva, A. G.

doi:10.1016/j.matpr.2019.01.034

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…In the most articles [1][2][3][4], which are written to define the gradient of the temperatures during the FSW, are based on the solution of the thermal conductivity equation and suggest numerical calculation methods. But the most important parameter is the amount of the heat power, which is applied in the heating zone (heat input).…”

Section: The Description Of the Technical Solution And The Methods Of...mentioning

confidence: 99%

Research of Heat Power in Friction Stir Spot Welding

Statsenko

Sukhorada

2019

KEM

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Nowadays the most perspective, high-tech and productive process is friction stir spot welding. The most important part of this technology is to determine the temperature of the material in the stir zone. This parameter is easily counted by the amount of the heat input, put in the welding zone. We made experimental researches about the relation of the heat power, therotation speed and the diameter of the working tool. For that purpose an experimental scheme was chosen, which models a welding material (aluminum alloy AMg5) as an experimental tube 20 mm in diameter. The tool (shear steel P6M5) is modeled as a working plate. Measurements of the frictional moments depending on the rotation speed of the experimental working tube during the constant temperature are made on the prepared stand. By the experimental data the specific heat input and the heat power were counted on every concentric ring, 2 mm in width, in the end of the working tool, 20 mm in diameter. Also, the sum of the heat power for the whole tool during various rotation speed terms was counted too. On the stand throughout the experiment were determined all the thermal conductivity heat losses along the rod, which the experimental tube was pinned on, all the working plate heat losses through the gasket towards the working desk and the convection from the surface of the rotating experimental tube to the environment. According the data, any of these losses is from 3 to 10 percent. This is shown in the heat input counting.

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Section: The Description Of the Technical Solution And The Methods Of...mentioning

confidence: 99%

Research of Heat Power in Friction Stir Spot Welding

Statsenko

Sukhorada

2019

KEM

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“…Site selection for the facility construction can have a significant effect on reducing costs and increasing the coverage level. us, an appropriate site to construct the facilities must also have maximum reliability [19][20][21]. is problem is important because many factors, such as natural disasters, result in failure of centers and influence the confidence level of system performance.…”

Section: Importance and Necessity Of Researchmentioning

confidence: 99%

A Mathematical Model for Locating the Medical and Emergency Centers considering the Failure Probability of Centers

Mosayebi

Mojaradi

Naeini

et al. 2020

Mathematical Problems in Engineering

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Enhancing the amount of industrial and chemical production is one of the most important effects of increasing rural people’s migration to cities, which leads to many abnormalities in the healthcare domain. In this regard, one of the most important tasks of health sector managers is designing and implementing some programs to monitor and control the level of community health, which is one of the health organizations’ strategic planning. On the other hand, the location of service centers is one of the most important problems in the area of strategic planning by any organization because selecting an appropriate site for constructing facilities can have a significant effect on reducing costs and increasing the coverage level. However, an appropriate site to construct the facilities must also have maximum reliability in addition to reducing costs and increasing the coverage level. This problem is important because many factors, such as natural disasters, result in failure of centers and influence the confidence level of system performance. Therefore, it is necessary to consider maximizing reliability in locating centers. For this purpose, an integer mathematical model is presented in this paper to select the optimum site for constructing the medical and emergency centers by considering the failure probability of each center. The research model’s objective function minimizes the system costs, including the costs of construction, patient transfer, and failure of medical and emergency centers. Finally, a numerical example is designed and reviewed by real-world problems to ensure the performance accuracy of the proposed model.

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“…The results of experimental studies of friction welding processes have become the basis for validating the methods for modeling physical processes that underlie these technologies [1][2][3][4][5]. Various types of numerical methods were used for numerical simulation of LFW and FSW processes [15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Titanium Alloys Plastic Flow in Linear Friction Welding

et al. 2021

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The article presents the results of the analysis of the plastic flow of titanium alloys in the process of the Linear Friction Welding (LFW). LFW is a high-tech process for joining critical structural elements of aerospace engineering from light and high-temperature alloys. Experimental studies of LFW modes of such alloys are expensive and technically difficult. Numerical simulation was carried out for understanding the physics of the LFW process and the formation laws of a strong welded joint of titanium alloys. Simulation by the SPH method was performed using the LS DYNA software package (ANSYS WB 15.2) and the developed module for the constitutive equation. The new coupled thermomechanical 3D model of LFW process for joining structural elements from alpha and alpha + beta titanium alloys was proposed. It was shown that the formation of a welded joint occurs in a complex and unsteady stress-strain state. In the near-surface layers of the bodies being welded, titanium alloys can be deformed in the mode of severe plastic deformation. A deviation of the symmetry plane of the plastic deformation zone from the initial position of the contact plane of the bodies being welded occurs during a process of LFW. Extrusion of material from the welded joint zone in the transverse direction with respect to the movement of bodies is caused by a pressure gradient and a decrease in the alloy flow stress due to heating. The hcp-bcc phase transition of titanium alloys upon heating in the LFW process necessitates an increase in the cyclic loading time to obtain a welded joint.

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Mathematical Modeling of Process of the Friction Stir Welding

Cited by 5 publications

References 7 publications

Research of Heat Power in Friction Stir Spot Welding

Research of Heat Power in Friction Stir Spot Welding

A Mathematical Model for Locating the Medical and Emergency Centers considering the Failure Probability of Centers

Modeling of Titanium Alloys Plastic Flow in Linear Friction Welding

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