Issue 53

A. Desai et alii, Frattura ed Integrità Strutturale, 53 (2020) 426-433; DOI: 10.3221/IGF-ESIS.53.33 430 factors for corresponding s/d ratios for (0/45)° and (0/90)° laminates respectively. The magnitudes of K IC and K IIC have been calculated by analytical formulations given in Eqns. (1) and (2) [3]. (a) (b) Figure 4: Load vs. displacement (0/45)° and (0/90)° fiber oriented glass/epoxy laminates s/d Average Peak Load F (N) K IC (MPa(m) 1/2 ) K IIC (MPa(m) 1/2 ) K eff (MPa(m) 1/2 ) 0 15000 0.00 10.66 10.66 0.2 14250 19.14 10.13 21.65 0.4 13320 35.77 9.47 37.00 0.6 12690 51.12 9.02 51.91 0.8 11930 64.08 8.48 64.64 1 11310 75.94 0.00 75.94 Table 1: Mixed-mode critical loads ( F ) and Average critical stress intensity factors ( K IC , K IIC , K eff ) [MPa m 0.5 ] for glass/epoxy (0/45)° laminate. s/d Average Peak Load F (N) K IC (MPa(m) 1/2 ) K IIC (MPa(m) 1/2 ) K eff (MPa(m) 1/2 ) 0 16320 0.00 11.60 11.60 0.2 15420 20.71 10.96 23.43 0.4 14380 38.62 10.22 39.95 0.6 13650 54.99 9.70 55.84 0.8 12880 69.18 9.15 69.79 1 12140 81.51 0.00 81.51 Table 2: Mixed-mode critical loads ( F ) and Average critical stress intensity factors ( K IC , K IIC , K eff ) [MPa m 0.5 ] for glass/epoxy (0/90)° laminate.