The main objects of this research are to determine the flow curves of very thin sheet metals for the micro metal forming and to study the scaling effects produced by miniaturization from macro to micro area. To determine flow curves in micro area, the tensile tests as well as the bulge tests were performed in this research. To realize it in micro area, an improved optical measurement system was combined with tensile tests, which makes it possible to determine the flow stress curves up to 10 µm sheet thickness. Furthermore, a bulge test equipment called “Aero-Bulgetest” was developed for the determination of flow stress in biaxial stress state. The developed Aero-Bulgetest shows a high accuracy and good repeatability for the determination of the flow curves of very thin sheet metals. With the improved measurement equipment, it is possible to determine the material properties of very thin sheets up to 10 µm thickness and to study the scaling effects of flow stress. The study on scaling effect was performed with various geometrical parameters in experiment as well as in FE-simulation. As a conclusion, the geometrical scaling effects of very thin sheets are shown.
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The main objects of this research are to determine the flow curves of very thin sheet metals for the micro metal forming and to study the scaling effects produced by miniaturization from macro to micro area. To determine flow curves in micro area, the tensile tests as well as the bulge tests were performed in this research. To realize it in micro area, an improved optical measurement system was combined with tensile tests, which makes it possible to determine the flow stress curves up to 10 µm s...
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