Modeling and Experimental Analysis of Shear-Slitting of AA6111-T4 Aluminum Alloy Sheet

Bohdal, Ł.; Kukiełka, L.; Legutko, Stanisław; Patyk, R.; Radchenko, Andrii

doi:10.3390/ma13143175

Cited by 34 publications

(19 citation statements)

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“…By writing specific equations of motion for all finite elements separated from the tool and the workpiece, after their summation, the equation of motion of the technological process is obtained. The general equation of motion of a discrete object, in the updated Lagrange description, at a typical incremental step t→τ, has the form [37][38][39][40][41][46][47][48]:…”

Section: Modeling Of the Construction Process Increasing The Rigidity Of The System-flange Extrusionmentioning

confidence: 99%

“…Figure 7 presents a geometric model and an adequate discrete model (the effectiveness of the model was checked on the basis of a sensitivity analysis) of the process of shaping the flange during radial stretching of the hole. After performing numerical calculations [46][47][48][49], the relationship was developed σ R = f(h) stresses from the flange height, shown in Figure 8 Example results of numerical calculations for the h6 model are shown in Figure 9, and for the h10 model in Figure 10.…”

Section: R ∆mentioning

confidence: 99%

“…Figure 7. Geometric model (a) and discrete model (b) during the flange forming process-radial stretching of the hole.After performing numerical calculations[46][47][48][49], the relationship was developed σ = f(h) stresses from the flange height, shown in Figure8, and the developed equation has the following form:…”

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confidence: 99%

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Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

et al. 2021

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The article presents an innovative method of reducing welding distortions of thin-walled structures by introducing structural and technological changes. The accuracy of the method was demonstrated on the example of welding the stub pipes to the outer surface of a thin-walled tank with large dimensions, made of steel 1.4301 with a wall thickness of 1.5 × 10−3 (m). During traditional Gas Tungsten Arc Welding (GTAW), distortions of the base are formed, the flatness deviation of which was 11.9 × 10−3 (m) and exceeded the permissible standards. As a result of structural and technological changes, not only does the joint stiffness increase, but also a favorable stress state is introduced in the flange, which reduces the local welding stresses. Numerical models were developed using the finite element method (FEM), which were used to analyze the residual stresses and strains pre-welding, in extruded flanges, in transient, and post-welding. The results of the calculations for various flanges heights show that there is a limit height h = 9.2 × 10−3 (m), above which flange cracks during extrusion. A function for calculating the flange height was developed due to the required stress state. The results of numerical calculations were verified experimentally on a designed and built test stand for extrusion the flange. The results of experimental research confirmed the results of numerical simulations. For further tests, bases with a flange h = 6 × 10−3 (m) were used, to which a stub pipe was welded using the GTAW method. After the welding process, the distortion of the base was measured with the ATOS III scanner (GOM a Zeiss company, Oberkochen, Germany). It has been shown that the developed methodology is correct, and the introduced structural and technological changes result in a favorable reduction of welding stresses and a reduction in the flatness deviation of the base in the welded joint to 0.39 × 10−3 (m), which meets the requirements of the standards.

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Section: Modeling Of the Construction Process Increasing The Rigidity Of The System-flange Extrusionmentioning

confidence: 99%

Section: R ∆mentioning

confidence: 99%

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Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

et al. 2021

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“…Modern methods, including ANSIS [24][25][26], can be used for simulation 27, 28 and optimizing 29-31 the processes and regimes of operation as well as statistical treatment of experimental data [32][33][34]. For estimating the efficiency of such greening and fuel saving technologies during the operation in actual climatic conditions various methods of modelling [35,36] are applied.…”

Section: Literature Reviewmentioning

confidence: 99%

Absorption of pollutants from exhaust gases by low-temperature heating surfaces

Kornienko¹,

Radchenko²,

Radchenko³

et al. 2021

E3S Web Conf.

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One of the most effective methods aimed to improving the environmental safety is fuel oil combustion in the form of specially prepared water-fuel emulsions. The combustion of water-fuel emulsion in internal combustion engines makes it possible to reduce a rate of low-temperature corrosion at wall temperatures below the dew point temperature of sulfuric acid vapor, to install a condensing lowtemperature heating surface in the exhaust gas boiler that leads to increase the efficiency of boiler. Therefore, it is of great importance to assess the effect of the presence of condensate (water, acid) and pollution on these surfaces on the processes of NOx, SO2 absorption from exhaust gases. Investigations of SO2, NOx and particulate matter emission were carried out on the experimental installation for fuel oil and water-fuel emulsion combustion with different water content. Using condensing heating surface enables to reduce the concentration of NOx and SO2 by 65 %. Experimental studies have shown that condensing heating surface ensures the capture of up to 30 % of particulate matter from the exhaust gas flow.

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“…Modern methods, including ANSIS [31][32][33], can be used for simulation and optimizing the processes. Some of methodological approaches gained in waste heat recovery refrigeration [34,35] might be successfully applied in air conditioning to choose design refrigeration capacity to match current cooling demand [36,37].…”

Section: Literature Reviewmentioning

confidence: 99%

Alternative variable refrigerant flow (VRF) air conditioning systems with rational distribution of thermal load

et al. 2021

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One of the most attractive reserves of enhancing the energetic efficiency of air conditioning systems (ACS) is to provide operation of compressors in closed to nominal modes by choosing the rational design refrigeration capacities and their distribution according to current thermal loading to provide closed to maximum annual refrigeration energy generation. Generally, the overall thermal load band of any ACS comprises the unstable load range, corresponding to ambient air precooling with significant load fluctuations, and a comparatively stable load part for further air conditioning from a threshold temperature to a target value. The stable thermal load range can be covered by operation of conventional compressor in closed to nominal mode, meantime ambient air precooling needs load modulation by applying a variable speed compressor. A proposed ACS enables a wide range of refrigerant flow variation without heat flux drop in air coolers and can be considered as advanced alternative to variable refrigerant flow systems.

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Modeling and Experimental Analysis of Shear-Slitting of AA6111-T4 Aluminum Alloy Sheet

Cited by 34 publications

References 50 publications

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

Absorption of pollutants from exhaust gases by low-temperature heating surfaces

Alternative variable refrigerant flow (VRF) air conditioning systems with rational distribution of thermal load

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