The conventional Forming Limit Diagram (FLD) is a well accepted tool for predicting formability and safety limit of material in sheet metal forming processes. The FLD can be determined using a procedure suggested by the American Society of Testing Materials (ASTM). The standard test method for determining a forming limit curve was published in ASTM E 2218-02. This method is also called the Limit Dome Height (LDH) test that is equipped with a hemispherical punch having a diameter of 100 mm. Hereby, sheet metal specimens with the same width of 200 mm trimmed to various form shapes with a radius of 0, 40, 50, 57.5, 65, 72.5 and 80 mm were used. These different specimen sizes describe different states of stress during forming process