Application of cellulose nanofiber (CNF) reinforced resin in suppressing damages in CFRP laminate with complex internal structures

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The purpose of this study is to effectively employ cellulose nanofiber (CNF) reinforced resin in between plies of carbon fiber reinforced plastics (CFRP) laminates to increase its interlaminar fracture toughness. To do so, the mechanism of enhancement of interlaminar fracture toughness by using CNF reinforced resin is being experimentally clarified. Therefore, some parameters such as the fiber volume, fiber length of CNF in the resin, etc. are adjusted to find the most effective way to obtain optimum performance of the resin. Currently, a technology for localizing CNF reinforced resin composites in CFRP laminates was developed. Besides, the optimal conditions for amount of CNF reinforced resin applied in the CFRP interlayer were also determined.