This paper reports the tensile, impact, and mode-I behaviour of glass fiber-reinforced polymer (GFRP) composites modified by incorporating graphene nanoplatelets (GnPs) on the fiber surface and in the epoxy matrix. The composites were fabricated through a hand lay-up technique followed by hot compression moulding. The homogeneous dispersion of GnPs in the matrix was achieved by mechanical mixing followed by ultra-sonication. The glass fibers were coated with varying quantities of GnPs (GnPs in epoxy) by the dip-coating technique. The composites containing 1 wt% GnPs on both the fiber surface and the matrix (0.5 wt% deposited on the fiber and 0.5 wt% dispersed in epoxy) enhanced the impact resistance by 45% and tensile strength by 114% over the pristine composite. The mode-I fracture toughness of the composite containing 1 wt% GnPs on both the fiber surface and the matrix was increased by 55% with the crack parallel to the fiber direction and 64% in a crack perpendicular to the fiber direction over the pristine composite. The presence of GnPs at the fiber/matrix interface toughened the fiber surface by preventing the matrix from cracking.

中文翻译：

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石墨烯纳米片修饰的玻璃纤维增​​强聚合物复合材料的拉伸，冲击和I型行为

本文报道了通过在纤维表面和环氧基质中掺入石墨烯纳米片（GnPs）改性的玻璃纤维增​​强聚合物（GFRP）复合材料的拉伸，冲击和I型行为。该复合材料是通过手工铺层技术制造的，然后进行热压成型。GnPs在基质中的均匀分散是通过机械混合然后超声处理实现的。通过浸涂技术用不同数量的GnP（环氧树脂中的GnPs）涂覆玻璃纤维。与原始复合材料相比，在纤维表面和基体上均包含1 wt％GnPs的复合材料（0.5 wt％沉积在纤维上，0.5 wt％分散在环氧树脂中）使抗冲击性提高了45％，拉伸强度提高了114％。在原始复合材料上，在纤维表面和基体上均包含1 wt％GnPs的复合材料的I型断裂韧性提高了55％（平行于纤维方向的裂纹和64％垂直于纤维方向的裂纹）。 。纤维/基质界面处存在GnP，通过防止基质开裂而使纤维表面增韧。