A thermal model of friction stir welding applied to Sc-modified Al–Zn–Mg–Cu alloy extrusions

Hamilton, C.; Sommers, Andrew D.; Dymek, S.

doi:10.1016/j.ijmachtools.2008.11.004

Cited by 74 publications

(32 citation statements)

References 16 publications

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“…The reason behind this could be explained by the heat energy generated during FSW. The total energy generated by the rotating pin tool to the workpiece (E total ), consisted of the energy due to the plastic deformation of the material (E plastic ) and the energy created by friction between the tool and workpieces (E friction ) [57],…”

Section: Tensile Propertiesmentioning

confidence: 99%

Tensile properties of a friction stir welded magnesium alloy: Effect of pin tool thread orientation and weld pitch

Chowdhury

Chen

Bhole

et al. 2010

Materials Science and Engineering: A

154

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Section: Tensile Propertiesmentioning

confidence: 99%

Tensile properties of a friction stir welded magnesium alloy: Effect of pin tool thread orientation and weld pitch

Chowdhury

Chen

Bhole

et al. 2010

Materials Science and Engineering: A

154

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“…In addition, a finer mesh window is kept near the tool-workpiece contact area in order to obtain a deeper insight into the results due to the large deformation occurring there. For the details of the model development, the inter-object boundary conditions between the tool and workpiece are assumed to be shear friction type, where the friction coefficient is considered to be 0.38 through the calibration with the experimental force data in which the minimum error could be achieved between the simulated and experimental results, while the heat capacity and the specific heat capacity are determined depending on the simulation calibration and literature research [13]. An environmental window is maintained behind the tool to simulate the cooling effect of liquid nitrogen whose size is approximately 3mm ×1mm.…”

Section: Fem Model and Simulation Resultsmentioning

confidence: 99%

Surface Layer Modification by Cryogenic Burnishing of Al 7050-T7451 Alloy and Validation with FEM-based Burnishing Model

et al. 2015

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As one of the chipless machining processes, burnishing has been performed on manufactured components as the final operation to improve the surface integrity, including reduced surface roughness and increased surface and subsurface hardness. Refined surface layers with ultra-fine grains or nano-grains could be generated during the burnishing process due to imposed severe plastic deformation and the associated dynamic recrystallization (DRX). These harder layers with compressive residual stresses induced by the burnishing process also provide added benefits by enhancing wear/corrosion resistance and increasing the fatigue life of the components. The research findings presented in this paper show the effects of cryogenic burnishing with roller burnishing tool on Al 7050-T7451 alloy, using liquid nitrogen as the coolant. Burnishing forces and temperatures are measured to compare the differences between dry and cryogenic burnishing. Higher tangential forces and lower temperatures are observed from cryogenic burnishing due to the work-hardening and the rapid cooling effects introduced by cryogenic burnishing. Also, refined layers with nano-grains (grain size of approximately 40 nm) are formed in the cryogenically burnished surface, in which an average hardness increase of 9.5%, 17.5% and 24.8% within the 200 m depth are achieved in comparison with the hardness values obtained from dry burnishing, at the corresponding burnishing speeds of 25, 50 and 100 m/min. A finite element model (FEM) is developed to simulate the burnishing forces and temperatures for validation of the experimental results, based on the modified Johnson-Cook flow stress model combined with the constitutive equations concerning DRX. Good agreement is obtained between the predicted and experimental results.

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“…Schmidt and Hattel [12] defined an analytical model for estimating the amount of heat generated during FSW that recognizes the shoulder and the probe of the welding tool as heat sources and concludes that about 89% of heat is generated at the shoulder. Heat has friction and deformation components and the total heat is a sum of both with influence of the contact state variable [12,13]. The effective value of the friction coefficient was used in calculations.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of friction stir welding

Mijajlović

Milčić

2014

THERM SCI

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Friction stir welding is a solid-state welding technique that utilizes thermo-mechanical influence of the rotating welding tool on parent material resulting with monolith joint-weld. On the contact of welding tool and parent material, significant stirring and deformation of parent material appears, and during this process mechanical energy is partially transformed into heat. The paper describes the software for the numerical simulation of friction stir welding developed at Mechanical Engineering Faculty, University of Nis. Numerical solution for estimation of welding plates temperature is estimated using finite difference method-explicit scheme with adaptive grid, considering influence of temperature on material's conductivity, contact conditions between welding tool and parent material, material flow around welding tool etc. The calculated results are in good agreement with the experimental results.

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A thermal model of friction stir welding applied to Sc-modified Al–Zn–Mg–Cu alloy extrusions

Cited by 74 publications

References 16 publications

Tensile properties of a friction stir welded magnesium alloy: Effect of pin tool thread orientation and weld pitch

Tensile properties of a friction stir welded magnesium alloy: Effect of pin tool thread orientation and weld pitch

Surface Layer Modification by Cryogenic Burnishing of Al 7050-T7451 Alloy and Validation with FEM-based Burnishing Model

Numerical simulation of friction stir welding

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