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Table 4 Percentage increase/decrease in mode I fracture energy of the CNT/epoxy with volume fraction compared to CF/epoxy composite at a constant CF volume fraction of 60%

From: Comparative study of elastic properties and mode I fracture energy of carbon nanotube/epoxy and carbon fibre/epoxy laminated composites

Material Laminate configuration Volume fraction (%) Δa (mm) ΔA (N mm) GI (J/mm2) % increase/decrease in GI (%)
CF/epoxy [0/0/0/0] 60 58.50 285.246 0.24380
CNT/epoxy [0/0/0/0] 15 62.50 295.914 0.23673 − 2.89
30 53.50 402.931 0.37657 54.46
60 46.00 614.285 0.66770 173.87
CF/epoxy [0/90/0/90] 60 56.50 239.351 0.21181
CNT/epoxy [0/90/0/90] 15 55.25 235.798 0.21339 0.75
30 57.75 296.463 0.25667 21.18
60 52.50 419.856 0.39986 88.78
CF/epoxy [0/30/–30/90] 60 55.75 236.373 0.21199
CNT/epoxy [0/30/–30/90] 15 57.00 240.932 0.21134 − 0.30
30 58.50 301.509 0.25770 21.56
60 51.75 407.321 0.39354 85.64