Finite Element Analysis of the Hydro-Mechanical Punching Process

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This paper investigates the characteristics of a hydro-mechanical punching process. The hydro-mechanical punching process is divided into two stages: the first stage is the mechanical half piercing in which an upper punch goes down before the initial crack is occurred; the second stage is the hydro punching in which a lower punch goes up until the final fracture is occurred. Ductile fracture criteria such as the Cockcroft et al., Brozzo et al. and Oyane et al. are adopted to predict the fracture of a sheet material. The index value of ductile fracture criteria is calculated with a user material subroutine, VUMAT in the ABAQUS Explicit. The hydrostatic pressure retards the initiation of a crack in the upper region of the blank and induces another crack in the lower region of the blank during the punching process. The final fracture zone is placed at the middle surface of the blank to the thickness direction. The result demonstrates that the hydro-mechanical punching process makes a finer shearing surface than the conventional one as hydrostatic pressure increases.
Trans Tech Publications
Issue Date

ICAM 2005, Helsinki, Finland


Hydro-mechanical punching; Ductile fracture criterion; Punching analysis; Hydrostatic pressure


Materials Science Forum Vols. 505-507 (2006) pp. 871-876

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ME-Conference Papers(학술회의논문)


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