Issue 72

H.E. Lakache et alii, Frattura ed Integrità Strutturale, 72 (2025) 62-79; DOI: 10.3221/IGF-ESIS.72.06

The AA6063 FLDs from NAKAZIMA test, for both types of blanks are presented in Figs. 13a and 13b. The FLDs obtained from simulations and experiments show close alignment, but it is apparent that the simulated major and minor strain values exceed the experimental ones. The minor strains in the FLD of NPSMs are greater than those observed in the FLD of PSM ones. Nevertheless, the major strains exhibit similar values in both types of blanks. Comparative study of the NAKAZIMA and MARCINIAK tests Fig. 14 exhibits a comparative study of NAKAZIMA and MARCINIAK tests for NPSMs. It can be noticed that, in the MARCINIAK test, the concentration of the von Mises stress and rupture occurrence is primarily localized in the contact zone between the punch and the blank, where the lateral fracture occurred in the in-plane for all specimens. This is in contrast to the NAKAZIMA test, where rupture coincides with the central zone for blanks of medium and large widths (L68, L90, L110, L130, L150, and L170), while blanks with smaller widths (L24 and L50) experience rupture in the lateral zones away from the center.

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