Issue 49

M. Abbadeni et alii, Frattura ed Integrità Strutturale, 49 (2019) 282-290; DOI: 10.3221/IGF-ESIS.49.28 286 material, the fracture can appear with the advancement of the punch. It is possible to prevent the strain concentrations by using suitable process parameters such as a good lubrication and an appropriate blank holder force. Figure 3 : Equivalent plastic strain distribution after 15 mm of punch displacement. Figure 4 : Strain distribution in the radial position after 15 mm of punch displacement.