Issue 47

F. Cucinotta et alii, Frattura ed Integrità Strutturale, 47 (2019) 367-382; DOI: 10.3221/IGF-ESIS.47.27

The impact tests show that the peak force and the stiffness are nearly independent from the impact energy, as well known from literature [20,21]. The absorbed energy is very similar between A and B sandwiches, as long as the sandwiches are not yet damaged (damage degree less than 1). To the maximum energy level tested there is a difference between the specimens. The damage degree of the Specimen B is equal to 1 and this states a perforation and complete failure. Fig. 13 reports the comparison between numerical and experimental results, again in terms of load-displacement curve. Energy A sandwich B sandwich

20 J

Load, kN

Load, kN

(a)

(b)

40 J

Load, kN

Load, kN

(c)

(d)

60 J

Load, kN

Load, kN

(e)

(f)

Figure 13 : A sandwich and B sandwich: FEA and Experimental comparison of impact tests at 20 J (a) and (b) , 40 J (c) and (d) , 60 J (e) and (f) .

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