This paper presents the fracture toughness, KIC, of a carbon fiber composite reinforced with the nanoparticle known as exfoliated graphite or graphene at room temperature and at cryogenic temperature. The measured KIC increased as mass fraction of graphene increase at room temperature and at cryogenic temperature for the composite with mass fraction of graphene of 0, 0.01, 0.1, 0.7, and 0.8.

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