IFWIInstrumented Falling Weight Impact (impact toughness testing)
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IFWI tests were performed on Fractovis 6785 (Ceast, Pianezza, Italy) using the following settings: maximal energy: 229.05 J; diameter of the dart: 20 mm; diameter of the support rig: 40 mm; weight of the dart: 23.62 kg; and drop height: 1 m.
Table 3 also contains the shrinkage values determined on IFWI specimens (for the related dimensions see Fig.
From the IFWI tests the perforation energy ([E.sub.p], the total energy specified by the thickness, J/mm) was determined.