Document Type : Original Article
Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
Formability, in the context of sheet metal, refers to the ability of the material to withstand deformation without developing defects during the shaping process. This process typically involves the application of force to the metal sheet using a punch and sheet holder, which results in a three-dimensional plastic change in the material. The Forming Limit Diagram (FLD) is a crucial tool that helps to visualize the plasticity limit of the sheet metal. The Forming Limit Diagram is represented by forming limit curves that display the range of strain combinations, indicating the initiation of the local throat. Essentially, these curves reveal how the main strains relate to the initiation of local throat, providing valuable insights into the material's formability under different conditions. In this article, the tensile qualities of the part were measured at various strain speeds. The plasticity limit curve was created using three different methods - experimental, theoretical, and finite element. We obtained the coefficients of Swift's work-hardening relationship to do this. The results show that all three methods were in good agreement with each other.