Abstract Stress concentration and weak interfacial strength affect the mechanical properties of short carbon fibers (CFs) reinforced polymer composites. In this work, the cauliflower-like short carbon fibers (CCFs) were prepared and the point was to illuminate the effects of fiber morphology on the mechanical properties of the CCFs/rigid polyurethane (RPU) composites. The results indicated that the surface structure of CCFs could increase the surface roughness of the fibers and the contact area between fibers and matrix, thereby promoting the formation of irregular interface. Compared with pure RPU and initial CFs/RPU composites, the strength and toughness of CCFs/RPU composites were simultaneously improved. The satisfactory performance was attributed to the special fibers structure, which played an anchoring role and consumed more energy during crack propagation.

中文翻译：

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菜花状短碳纤维对硬质聚氨酯基复合材料力学性能的影响

摘要 应力集中和弱界面强度影响短碳纤维（CFs）增强聚合物复合材料的力学性能。在这项工作中，制备了花椰菜状短碳纤维 (CCFs)，重点是阐明纤维形态对 CCFs/刚性聚氨酯 (RPU) 复合材料机械性能的影响。结果表明，CCFs的表面结构可以增加纤维的表面粗糙度和纤维与基体的接触面积，从而促进不规则界面的形成。与纯RPU和初始CFs/RPU复合材料相比，CCFs/RPU复合材料的强度和韧性同时得到提高。令人满意的性能归功于特殊的纤维结构，