Abstract
During deep drawing process compressive stresses are induced in the sheet metal, which can cause undesirable wrinkling. On the other hand a high sheet thickness and high local surface curvature counteract the wrinkling tendency by stabilizing the blank. To investigate these factors influencing the wrinkling initiation experimentally, a modified and the requirements customized test form based on a simple test geometry, the so called Yoshida buckling test, is created. This enables to take into account surface curvature in the region of instability.
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