Influence of the Thickness Value on the Mechanical and Formability Properties of the CuZn37 Thin Sheet Metal

The increase of the degree of miniaturization of the mechanical systems leads to the increase of the production requirements for micro or mili parts made using the micro and milli deep drawing processes. In the case of micro or mili drawn parts, the sheet thickness has an important influence on the intensity of the specific phenomena that occur during micro and milli cold forming and has also an important effect on the drawn part integrity or accuracy. The present study was focused on the investigation of the material behaviour, including mechanical properties and forming limit curve of CuZn37 when different thicknesses of sheets are used. For this purpose, experimental determinations were made by using the following two values of the sheet thickness: 0.1 and 0.2 mm. For each sheet thickness, the mechanical properties and the forming limit curves (FLC) were determined and compared. The obtained results concerning the influence of the sheet thickness on the material mechanical and formability properties shown that the level of the stress strain curve determined for the sheet thickness having 0.1 mm is greater than in the case of sheet thickness having 0.2 mm but the maximum strain and the anisotropy coefficients are lower. The level of the forming limit curves (FLC) in the case of sheet thickness having 0.2 mm is greater than in the case when the sheet thickness is equal to 0.1 mm.