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1 Archives of Civil and Mechanical Engineering

1 2023

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Material flow law and mechanical property of 5052 aluminum alloy sheets under dynamic and quasi-static hole-flanging

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Zhang L. , Cui X. , Yan Z. , Yang G.

tom Vol. 23, no. 3

art. no. e203, 2023

The formability of aluminum alloys at room temperature is low, which can lead to the fracture of the sheets under traditional stamping. In this work, electromagnetic forming (EMF) and stamping flanging of 5052 aluminum alloy sheets were performed by experimentally and 3D numerical simulation. Under stamping flanging, when the prefabricated hole diameter decreases, the flanging height increases, but the gap between the flanged part and die and maximum thinning rate becomes larger. With the increase of discharge voltage, the fittability of the flanged parts is improved. There is a critical discharge voltage, under which the fittability and maximum thinning rate are optimal. Compared with stamping, the sheet flanging height is larger under EMF. This is due to the inner and outer layers of sheet fillet are subjected to greater radial tensile strain, and the thickness of sheet fillet are reduced after EMF. In addition, the sheet mouth collides with die at high speed, which causes the mouth material extend radially. The results revealed that the hardness of outer and middle layers at the sheet fillet was larger after EMF than that after stamping, while that of the inner layer was relatively small. This distribution of hardness corresponds to material strain.