Finite element simulation of punching

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This work is a study of a punching process using the ABAQUS/Explicit FE- code. A damage model based on equivalent plastic strain has been used to describe crack initiation and propagation in the blank. An axisymmetric model created in ABAQUS/CAE was used throughout the study. The model consists of a punch, blank holder, die and blank. In this work the punch, blank holder and die are modelled as rigid bodies while the blank is considered elastic-plastic. The materials used in simulations are DC04, Docol 350 YP, Docol 800DP and DC1400M. This selection of steel qualities has a wide span in mechanical properties and fields of application. Material characterisation for simulation purposes has been done by conducting uniaxial tensile tests. The data from these tests have been extrapolated beyond the necking strain by double Voce extrapolation. Punching experiments have been performed in an excenter driven press equipped with position and force measurement devices. The experiments result in load curves for the different steel qualities and gives information about the characteristic zones of the sheet edges. The results from simulations have been evaluated by comparisons with experiments concerning load curves, characteristic zones of the sheet edge, work done during the operation, maximum forces and s...