Issue 48

T. Febra et alii, Frattura ed Integrità Strutturale, 48 (2019) 242-248; DOI: 10.3221/IGF-ESIS.48.25 245 Figure 3 : Influence of impact energy on response parameters: a) Recovered energy versus impact energy; b) Dynamic modulus versus impact energy. Figs. 4a) and 4b) show exemplary photos of the damage zones on a talc filled PP with multiaxial glass fibre mesh insert (MGFm) sample tested for impact energy of 6J in impact side and back side, respectively. As well reported in literature for fiber-reinforced composites [19] , higher damage occurred in the backside in which a long failure crack is observed, while in the impact side only a regular plastic deformation caused by impactor occurs. Figure 4 : Exemplary photos of the damage on a MGFm sample tested for impact energy of 6J: a) Impact side; b) Back side. (a) (b) Figure 5 : Exemplary Cscan images of damaged zones for impact energy of 5J: a) BGFn mat; b) Km mat.