Experimental and Numerical Analyses of Magnetic Pulse Forming of A1050 Aluminum Sheet

Kambe, Takashi; Kedo, Yasutaka; Muraishi, Shinji; Kumai, Shinji

doi:10.2320/matertrans.l-m2019862

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…The governing equations of electromagnetic field can be found in the previous report. 10) Table 3 The properties of flyer plate, parent plate, coil and anvil used for Model 1. the accompanying temperature rise using the SPH method. Figure 6 shows the schematic diagram of Model 2.…”

Section: Numerical Analysis Methodsmentioning

confidence: 99%

Experimental and Numerical Analyses of Wavy Interface Formation and Local Melting Phenomena at the Magnetic Pulse Welded Al/Fe Joint Interface

Muraishi

Kumai

2021

Mater. Trans.

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A 1050-O aluminum plate and a low carbon steel (SPCC) plate were seam welded by magnetic pulse welding (MPW). Experimental and numerical analysis methods were combined to investigate the wavy interface formation and local melting phenomena at the Al/Fe joint interface. The metallographic observation results showed that Al/Fe joint interface presents a trigger-like wave shape with two types of intermediate layers intermittently formed at the interface. Collision angle between two plates and impact velocity of Al sheet driven by electromagnetic force was numerically solved by coupled mechanical and electromagnetic fields analysis. The metal jet emission behavior, wavy interface formation process and the temperature change during MPW collision process was analyzed by SPH method. The numerical results showed that the temperature near the interface exceeds the melting point of both Al and Fe at extremely high pressure, which leads to the formation of a local melting zone (LMZ) where Al and Fe were mixed in melted state. The numerically reproduced wavy interface morphology showed a good consistency with the experimentally observed results.

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Section: Numerical Analysis Methodsmentioning

confidence: 99%

Experimental and Numerical Analyses of Wavy Interface Formation and Local Melting Phenomena at the Magnetic Pulse Welded Al/Fe Joint Interface

Muraishi

Kumai

2021

Mater. Trans.

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“…The analysis was divided into two steps including (1) high-speed oblique collision process caused by electromagnetic force and (2) wavy interface formation process. The numerical analysis models described below are mainly based on the model reported by Kambe et al [3].…”

Section: Numerical Analysis Methodsmentioning

confidence: 99%

“…The constitutive model used for this study was the Steinberg-Guinan constitutive model, which represents the mechanical behavior of metals. [3]…”

Section: Appendicesmentioning

confidence: 99%

Similarity and dissimilarity of joint interface morphology in magnetic pulse welded Al/Cu and Al/Ni plates

2020

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A characteristic wavy morphology often appears at the joint interface of magnetic pulse welding (MPW), and an intermediate layer is formed in some metal combinations. It has been known that the wavy morphology changes mainly depend on the density difference between the metals. A sinusoidal wavy interface is formed for the combination of similar metals (Al/Al, Cu/Cu) and that of dissimilar metals having almost the same density (Cu/Ni). In contrast, a trigger-like wavy interface is formed for the combination having a large density difference (Al/Cu, Al/Fe). The difference in strength (hardness) of the solid metal is also assumed to affect the wavy interface morphology. In the present study, two metal combinations (Al/Cu and Al/Ni) were subjected to the MPW to elucidate the effect of hardness difference, since Cu and Ni have almost the same density, but different hardness. Both the MPWed Al/Cu and Al/Ni joints showed a trigger-like wave interface. The wave size (wave-height and wavelength) of Al/Ni was smaller than that of Al/Cu. In Al/Ni, the distribution of intermediate phase was more continuous tracing the outline of the wave. The numerical simulation of the wave formation process was performed using the Smoothed Particle Hydrodynamics (SPH) method. It was revealed that the extent of metal jet penetration into the metal in the process of joining behind the collision point was weaker in Ni than in Cu. This is considered to be due to the larger deformation resistivity of Ni, which is harder than that of Cu.

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“…Fig. 1 (a) Schematic illustration of experimental setup, (b) view from CD direction, (c) view from GD direction 6 .…”

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confidence: 99%

Magnetic pulse forming behavior and the high speed deformation structure of A1050 aluminum sheet

Kambe

Muraishi

Kumai

2021

J.JILM

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An A1050 aluminum sheet was collided against a steel mold with a small V-shaped through-thickness groove by magnetic pulse forming (MPF), and the deformation structure was investigated. The local changes in strain rate, strain and temperature during MPF were investigated by using a series of numerical analyses. Almost no change in grain morphology was observed at the mid-thickness area of the sheet. In contrast, an extremely large intensive deformation occurred at the aluminum sheet surface located in the groove. The ultrafine grains of several to several tens of nanometers were observed on the surface of the aluminum sheet. The changes in strain rate, strain and temperature were also investigated by using ANSYS AUTODYN. The simulation results revealed that the sheet flew into the groove at an extremely high local strain rate exceeding 10 7 s 1 . Furthermore, a large temperature increase exceeding 1000 K at the sheet surface was estimated by the simulation. The cooling process was also reproduced by Open-FOAM. It was revealed that the rapid cooling of 10 8 10 9 K/s order occurred on the sheet surface. It is considered that the ultrafine grains observed at the sheet surface resulted from the local melting and the successive rapid cooling.

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Experimental and Numerical Analyses of Magnetic Pulse Forming of A1050 Aluminum Sheet

Cited by 4 publications

References 15 publications

Experimental and Numerical Analyses of Wavy Interface Formation and Local Melting Phenomena at the Magnetic Pulse Welded Al/Fe Joint Interface

Experimental and Numerical Analyses of Wavy Interface Formation and Local Melting Phenomena at the Magnetic Pulse Welded Al/Fe Joint Interface

Similarity and dissimilarity of joint interface morphology in magnetic pulse welded Al/Cu and Al/Ni plates

Magnetic pulse forming behavior and the high speed deformation structure of A1050 aluminum sheet

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