A multiscale crack-bridging model is developed to analyze the effects of bridging toughening of nanofibrils on the fracture toughness of cellulose nanopaper. The effects of nanofibril sizes on the bridging toughening mechanism in cellulose nanopaper are examined. It is found that cellulose nanofibrils exhibit a distinct size-dependence in enhancing the fracture toughness of cellulose nanopaper. The thinner and longer nanofibrils can more effectively enhance the crack resistance of cellulose nanopaper.
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