Analysis and prediction of the earing behaviour of low carbon steel sheet

The earing behaviour during a cup drawing test was studied for a wide range of low carbon steel sheets, in order to check the validity of an existing model for the earing of anisotropic metal sheets. The modelling of the anisotropic behaviour of the metal sheet was made using the Taylor theory of polycrystal plasticity, which was implemented in a simplified cinematic model for the material flow during a cup-drawing test. Both the relaxed constraints and full constraints model were tested and mutually compared. This evaluation was one of the main goals of the research. It will be shown that by using the full constraints Taylor theory, a very good correlation can be found between measured and predicted ear heights after cup drawing. Deviations of the predicted behaviour can be explained on the basis of literature data about the texture evolution during a cup drawing test. The model could however not predict the average cup height accurately. This is probably due to the fact, that the model does not take the ironing effect that takes place during the cup drawing test into account. KEY WORDS: Cup drawing, earing, full constraints Taylor theory, relaxed constraints Taylor theorystatus: publishe