Depiction of interfacial morphology in impact welded Ti/Cu bimetallic systems using smoothed particle hydrodynamics

Nassiri, A.; Vivek, Anupam; Abke, Tim; Liu, Bert; Lee, Taeseon; Daehn, Glenn S.

doi:10.1063/1.4984742

Cited by 53 publications

(9 citation statements)

References 24 publications

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“…From Figure 3 it can be noted that Equation 12gives a lower critical impact velocity, and, accordingly, a narrower weldability window, as compared to Equation (13).…”

Section: Upper Limitmentioning

confidence: 99%

“…SPH technique was used extensively in recent years to analyze various aspects of high-velocity impact welding. Unlike other methods, for example, Euler or Lagrangian, SPH reproduces well the basic phenomena associated with high-velocity impact welding-the formation of jets, waves and vortex zones, and it is well suited for analyzing the pressures in the impact zone [4,[7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Welding Window: Comparison of Deribas’ and Wittman’s Approaches and SPH Simulation Results

Émurlaeva

Батаев

Zhou

et al. 2019

Metals

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A welding window is one of the key concepts used to select optimal regimes for high-velocity impact welding. In a number of recent studies, the method of smoothed particle hydrodynamics (SPH) was used to find the welding window. In this paper, an attempt is made to compare the results of SPH simulation and classical approaches to find the boundaries of a welding window. The experimental data on the welding of 6061-T6 alloy obtained by Wittman were used to verify the simulation results. Numerical simulation of high-velocity impact accompanied by deformation and heating was carried out by the SPH method in Ansys Autodyn software. To analyze the cooling process, the heat equation was solved using the finite difference method. Numerical simulation reproduced most of the explosion welding phenomena, in particular, the formation of waves, vortices, and jets. The left, right, and lower boundaries found using numerical simulations were in good agreement with those found using Wittman’s and Deribas’s approaches. At the same time, significant differences were found in the position of the upper limit. The results of this study improve understanding of the mechanism of joint formation during high-velocity impact welding.

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“…From Figure 3 it can be noted that Equation 12gives a lower critical impact velocity, and, accordingly, a narrower weldability window, as compared to Equation (13).…”

Section: Upper Limitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Welding Window: Comparison of Deribas’ and Wittman’s Approaches and SPH Simulation Results

Émurlaeva

Батаев

Zhou

et al. 2019

Metals

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show abstract

“…It is known that an impact welded joint consists of an unwelded center region followed by a welded region on both sides. The welded region is then followed by an unwelded region at the end of weld line 18) . In the case of VFAW welding, the nugget diameter was measured based on the deformation area during welding.…”

Section: Microstructural Variations In Weldsmentioning

confidence: 99%

Microstructure Evaluation of Vaporizing Foil Actuator Welds of 1 GPa Strength Steel

Yoon

Lee

2020

Journal of Welding and Joining

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Demands for weight reduction in automobiles have been constantly increasing due to its environmental impact, leading to increased interests in light metals such as aluminum and magnesium. However, for most structural applications that require large energy absorption, implementation of high strength steel is still a pervasive solution. When the high strength steel having a high martensite fraction (DP 980) is joined by resistance spot welding, a softening zone is generated in the welds, leading to the reduction of the strength of the welds. In addition, high strength steels generally contain a large amount of carbon and alloying elements. As a result, the carbon equivalent exhibiting hardenability increases, having the welded part become weak, and making it difficult to secure the performance required by the part or the vehicle body. Vaporizing foil actuator welding (VFAW) which is one of the solid-state welding techniques utilizes a high-pressure pulse generated by the vaporization of an aluminum foil to cause high speed collision of flyer and target sheets to create solid-state bonds with negligible melting at the weld interface. So, VFAW produces joints with little to no HAZ. In this study, to examine the vaporizing foil actuator welding properties of 1 GPa grade high strength steel, microstructure analysis and hardness test were performed. The test results were compared with the resistance spot welding properties of the same material.

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“…In particular, fragmentation can be modeled naturally, governed by physical laws. Smoothed-particle hydrodynamics (SPH) has been widely used for modeling impact welding [10][11][12][13][14][15] and captured jetting and interfacial wave formation. Efficient computation of shape functions is one of SPH's advantages.…”

Section: Introductionmentioning

confidence: 99%

“…However, the lack of high order consistency, tensile instability, undesired numerical fracture, and inaccurate gradient estimates in stress calculations [16] are common difficulties in SPH methods that can lead to unstable and inaccurate solutions in highly deformed materials and require a highly refined domain discretization and additional treatments/modifications to achieve desirable accuracy and stability and avoid the aforementioned issues. In explosive/impact welding simulations, such issues can produce unstable and unphysical particle distributions when large interfacial waves are formed [11]. Also, when the flyer plate is under severe bending, instabilities in displacement and stress can be shown throughout the plate [14,15].…”

Section: Introductionmentioning

confidence: 99%

A semi-Lagrangian reproducing kernel particle method with particle-based shock algorithm for explosive welding simulation

Baek¹,

Chen²,

Zhou

et al. 2021

Comput Mech

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The explosive welding process is an extreme-deformation problem that involves shock waves, large plastic deformation, and fragmentation around the collision point, which are extremely challenging features to model for the traditional mesh-based methods. In this work, a particle-based Godunov shock algorithm under a semi-Lagrangian reproducing kernel particle method (SL-RKPM) is introduced into the volumetric strain energy to accurately embed the key shock physics in the absence of a mesh or grid, which is shown to also ensure the conservation of linear momentum. For kernel stability, a deformation-dependent anisotropic kernel support update algorithm is proposed, which is shown to capture excessive plastic flow and material separation. A quasi-conforming nodal integration is adopted to avoid the need of updating conforming cells which is tedious in extreme deformations. It is shown that the proposed formulation effectively captures shocks, jet formation, and smooth-to-wavy interface morphology transition with good agreement with experimental results.

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Depiction of interfacial morphology in impact welded Ti/Cu bimetallic systems using smoothed particle hydrodynamics

Cited by 53 publications

References 24 publications

Welding Window: Comparison of Deribas’ and Wittman’s Approaches and SPH Simulation Results

Welding Window: Comparison of Deribas’ and Wittman’s Approaches and SPH Simulation Results

Microstructure Evaluation of Vaporizing Foil Actuator Welds of 1 GPa Strength Steel

A semi-Lagrangian reproducing kernel particle method with particle-based shock algorithm for explosive welding simulation

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