A fuzzy finite element model based on the eigenstrain method to evaluate the welding distortion of T-joint fillet welded structures

Cai, Shupeng; Zhang, Yongkang; Wu, Jianxin; Wu, Fang

doi:10.1016/j.jmapro.2022.03.029

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…[ 40 ] The idea of combining evolutionary algorithms with eigenstrain theory in a fuzzy finite element model [ 36 ] was also applied to a more complex weld form for full‐field reconstruction of residual stresses. [ 41 ] However, all these attempts and previously developed full‐field eigenstrain reconstruction methods are based on guiding information about the distribution of eigenstrains that aims to find a match between resulting and experimentally determined deformations or residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Voxel‐Based Full‐Field Eigenstrain Reconstruction of Residual Stresses

Uzun

Korsunsky

2023

Adv Eng Mater

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Inverse eigenstrain (inherent strain) analysis methods are shown to be effective for the reconstruction of residual stresses in plane eigenstrain problems (continuously processed bodies) while conversely residual stress reconstruction in discontinuously processed bodies is extremely challenging and necessitates the use of complex regularizing assumptions. Herein, a new generic inverse eigenstrain method suitable for the reconstruction of residual stresses along with residual elastic strains and displacements in discontinuously processed bodies is introduced. The proposed method uses the superposition of eigenstrain radial basis functions together with a set of limited experimental data for model‐free (unconstrained) determination of unknown eigenstrain fields. This approach eliminates the limitations introduced by global basis functions such as polynomials. The novel point of this method is the ability to account for all six components of strain in an isotropic body without using regularizing assumptions. By lifting complex guiding formulation, the fidelity of full‐field eigenstrain reconstruction becomes directly related to the quality of experimental data and proper discretisation of the model domain. The FEniCS implementation has been validated using the experimental data of pointwise high‐energy synchrotron X‐ray diffraction measurements from a bent titanium alloy bar. A hybrid high throughput computing approach is also introduced for effective parallel computing.

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Section: Introductionmentioning

confidence: 99%

Voxel‐Based Full‐Field Eigenstrain Reconstruction of Residual Stresses

Uzun

Korsunsky

2023

Adv Eng Mater

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“…Khoshroyan et al [28] adopted the 3D thermo-mechanical coupled FE method for welding deformation, residual stress, and temperature distribution, and the vertical deformation, angular distortion, transverse shrinkage, and residual stress in the plate and stiffener are greatly affected by welding speed, sequence, and welding current. Cai et al [29] proposed a fuzzy finite element model to assess the welding distortion in T-joint fillet welding with the eigenstrain method, combining with thermal elastoplastic finite element results, which explains the generation mechanism of welding distortion related to the formation of the heat-affected zone.…”

Section: Introductionmentioning

confidence: 99%

A Study on Welding Characteristics, Mechanical Properties, and Penetration Depth of T-Joint Thin-Walled Parts for Different TIG Welding Currents: FE Simulation and Experimental Analysis

Mao

Sun

et al. 2022

Metals

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Considering the effect of heat input of tungsten inert gas (TIG) arc welding for T-joint welding of thin-walled parts of aluminum alloy 6061-T6, here, the welding characteristics are analyzed via the finite element method. The experiments are carried out using scanning electron microscope (SEM), optical microscope (OM), and tensile test of specimens to investigate the microstructure variation of the weld zone (WZ), heat-affected zone (HAZ), and base metal (BM), and the mechanical properties of the T-welded joint. The mechanical properties of the T-welded joint are explored and assessed combined with the tensile test in terms of yield strength, tensile strength, and Vickers hardness. Furthermore, the effects of different welding currents on welding penetration variation under welding deformation are thoroughly investigated, and the appearance of porosity and incomplete fusion defects of T-welded joints are clearly illustrated. The results show that the yield and tensile strength of T-welded joints, respectively, account for less than 37% and 74% of the base metal (BM) strength. Moreover, the welding penetration depth and microstructure of T-welded joints are deeply affected by the welding current. The maximum penetration depth is achieved at about 2.18 mm under the maximum welding current, and partial welding defects emerged, affecting and reducing the mechanical properties of the welded joint. It is expected that these results will provide an analysis foundation for optimization of the welding process, suppression of welding defects, and promotion of mechanical properties for thin-walled parts in the future.

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“…The subsequent rapid cooling of molten materials leads to material shrinkage in the weld zone and its immediate vicinity. It is generally known that this phenomenon leads to the appearance of undesirable effects such as changes in the crystal structure, changes of mechanical properties in the weld zone and the occurrence of permanent plastic deformations and residual stresses [1][2][3][4]. Plastic deformations disrupt the external appearance and cause dimensional deviations which is a problem when assembling pipe structures, while on the other hand, residual stresses contribute to the appearance of cracks and generally shorten the life of the welded structure [5,6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Measurement of Residual Stresses in a Thick-Walled Buried-Arc Welded Pipe Structure

Perić

Garašić

Gubeljak

et al. 2022

Metals

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In this study, a numerical simulation of a single pass welding of two thick-walled pipes with the buried-arc method was performed in order to determine the residual stresses caused by welding. The numerical simulation procedure in the thermal analysis was performed by the element birth and death method while the structural analysis was performed simultaneously, without the application of the element birth and death technique in order to reduce the duration of the numerical simulation. The simulation results were validated by experimental residual stress measurements on the outside surfaces of the welded model using the X-ray diffraction technique. A good agreement between the results of the numerical simulation and experimental measurements was confirmed.

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A fuzzy finite element model based on the eigenstrain method to evaluate the welding distortion of T-joint fillet welded structures

Cited by 8 publications

References 28 publications

Voxel‐Based Full‐Field Eigenstrain Reconstruction of Residual Stresses

Voxel‐Based Full‐Field Eigenstrain Reconstruction of Residual Stresses

A Study on Welding Characteristics, Mechanical Properties, and Penetration Depth of T-Joint Thin-Walled Parts for Different TIG Welding Currents: FE Simulation and Experimental Analysis

Numerical Simulation and Experimental Measurement of Residual Stresses in a Thick-Walled Buried-Arc Welded Pipe Structure

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