A Coupled Rigid-viscoplastic Numerical Modeling for Evaluating Effects of Shoulder Geometry on Friction Stir-welded Aluminum Alloys

Villegas, Jonathan Fabregas; Guarin, Alvaro; Unfried-Silgado, Jimy

doi:10.5829/ije.2019.32.02b.17

Cited by 4 publications

(5 citation statements)

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“…HAZ extension depends on the process parameters combination used. When R-values were higher, the width of HAZ also increased, being consistent with higher revolutions per unit of length producing a higher peak of temperature near to pin of tool [33]. In Figure 12 can be observed that the maximum peak of temperature was ~857 K in stir region.…”

Section: Simulation Of Thermal Evolution In Welded Jointssupporting

confidence: 52%

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Effects of tool shoulder geometry on mechanical properties and microstructure of friction-stir welded joints of AA5083-0 aluminium alloys

Ortega

Fernandez

Santa

et al. 2020

JMES

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Shoulder geometry is an important geometrical feature of tool design in friction stir welding since it has a strong effect on heat generation and material flow. In this paper the effect of shoulder geometry of tool on mechanical properties, microstructure evolution, and thermal history of friction stir welded joints of AA5083-O aluminium alloy. Two different shoulder geometries of tool named concave and featured (concentric circles) were used, both with cylindrical threaded pin. A set of samples were fabricated using a milling machine and a factorial experimental design to estimate the effects of process parameters (rotational and welding speed) and shoulder geometry on welded joints. Tensile strength, hardness, and microstructure evolution were experimentally measured. These observations were complemented with results obtained from a finite element modelling to calculate thermal history in welded joints. The results showed that the combination of revolution pitch R-value and shoulder geometry of tool were the most significant factors, affecting to mechanical properties, thermal behaviour, and microstructure evolution. The best tensile properties were obtained with a featured shoulder tool using 1400 rpm and 16 mm.min-1, and 1085 rpm and 11 mm.min-1 for rotational and welding speed. The same parameter combination resulted in a joint efficiency of 70% and 65%, respectively. In addition, the results of evaluation using an ANOVA analysis with fixed factors showed that increasing R-values produces statistically significant differences in ultimate strength (Sut) values.

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Section: Simulation Of Thermal Evolution In Welded Jointssupporting

confidence: 52%

“…The extension of HAZ can be limited by statically recrystallization temperature since it experiences only a thermal cycle, which is in the range from 433 K to 486 K for aluminium alloys, Villegar et al, and McNelley et. al, in [33,34]. journal.ump.edu.my/jmes ◄…”

Section: Simulation Of Thermal Evolution In Welded Jointsmentioning

confidence: 99%

Effects of tool shoulder geometry on mechanical properties and microstructure of friction-stir welded joints of AA5083-0 aluminium alloys

Ortega

Fernandez

Santa

et al. 2020

JMES

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“…In other related studies, contact friction is designed analytically in the involute of gears, as well as the simulation of non-newtonian liquids, CFD applications, DOE design of experiments, and remeshing in deformable systems by finite elements, as also indicated in Ref. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Elastohydrodynamic Lubrication in Spur Gears

Rafael Ramirez,

Andrés Rodríguez,

Jonathan Fabregas

et al. 2024

CFDL

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An analysis using computational modeling by finite elements of the phenomenon of elastohydrodynamic lubrication (EHL) was carried out for a transmission system of pinion gear in a crankcase with partial filling lubrication. The analysis utilized tribological studies describing the contact behavior characteristics of solid surfaces with the lubrication film caused by dragging and splashing. Furthermore, the characteristics of the Reynolds-Hertz model for this type of phenomena are described, as well as the equations of elastic deformation and elastic displacements along with the geometry of the non-concordant bodies in contact. This was done by modeling the Lagrangian-Eulerian type for non-Newtonian fluid, implementing multiphysics coupling methods. The pressure profile of the lubricant films, the temperature reached by the lubricant, and the von Mises stress at the contact were obtained, showing a good approximation with the related results, indicating a range of 30 MPa to 900 MPa of pressure in the lubricant film and von Mises stress ranging from 30 MPa to 100 MPa in the contact area of the gear tooth.

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“…Azizi et al [19] studied gas-solid heat transfer in risers using two-fluid CFD modeling to evaluate the effect of bed angle and particle feed velocity. Villegas et al [20] used a coupling of computational tools, applying CFD to represent the friction-stir welding phenomenon. Culun et al [21] developed a synergistic analysis in CFD of heat transfer of impinging multi jets, evaluating parameters such as the geometry of the jet holes, their arrangement, the density of the jets through spanwise and streamwise directions, and the type of confinement.…”

Section: Introductionmentioning

confidence: 99%

CFD Modeling of Microchannels Cooling for Electronic Microdevices

Fábregas

Santamaria

Buelvas

et al. 2022

IIUMEJ

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A simulation of the cooling of electronic devices was carried out by means of microchannels, using water as a coolant to dissipate the heat generated from a computer processor, and thus stabilize its optimum operating temperature. For the development of this study, computational fluid mechanics modeling was established in order to determine the temperature profiles, pressure profiles, and velocity behavior of the working fluid in the microchannel. In the results of the study, the operating temperatures of the computer processor were obtained, in the ranges of 303 K to 307 K, with fluid velocities in the microchannels of 5 m/s, a pressure drop of 633.7 kPa, and a factor of safety of the design of the microchannel of 15. From the results, the improvement of the heat transfer in a cooling system of electronic devices was evidenced when using a coolant as a working fluid compared to the cooling by forced air flow traditional. ABSTRAK: Simulasi penyejukan alatan elektronik telah dibina menggunakan saluran mikro, di samping air sebagai agen penyejuk bagi menghilangkan haba yang terhasil dari pemproses komputer, dan penstabil pada suhu operasi optimum. Kajian ini mengenai model komputasi mekanik bendalir bagi menentukan profil suhu, profil tekanan, dan halaju perubahan bendalir dalam saluran mikro. Dapatan kajian menunjukkan suhu operasi pemproses komputer adalah pada julat suhu 303 K sehingga 307 K, dengan halaju bendalir dalam saluran mikro adalah pada kelajuan 5 m/s, penurunan tekanan sebanyak 633.7 kPa, dan faktor keselamatan 15 bagi reka bentuk saluran mikro. Ini menunjukkan terdapat kenaikan pemindahan haba bagi sistem penyejukan alatan elektronik ini, terutama apabila cecair digunakan sebagai penyejuk haba berbanding kaedah tradisi iaitu dengan mengguna pakai aliran udara sebagai agen penyejuk.

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A Coupled Rigid-viscoplastic Numerical Modeling for Evaluating Effects of Shoulder Geometry on Friction Stir-welded Aluminum Alloys

Cited by 4 publications

References 0 publications

Effects of tool shoulder geometry on mechanical properties and microstructure of friction-stir welded joints of AA5083-0 aluminium alloys

Effects of tool shoulder geometry on mechanical properties and microstructure of friction-stir welded joints of AA5083-0 aluminium alloys

Modeling and Simulation of Elastohydrodynamic Lubrication in Spur Gears

CFD Modeling of Microchannels Cooling for Electronic Microdevices

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