Abstract Hybrid composites combining brittle and ductile reinforcing fibres can be designed to have pseudo-ductile behaviour by controlling their failure mechanisms. The recently developed carbon-fibre/self-reinforced polypropylene (SRPP) hybrids have demonstrated a unique combination of stiffness (7 GPa), toughness (>6% strain) and density (±1000 kg/m³). Here, the influence of a circular notch on their failure mechanisms is investigated. Discontinuous carbon-fibre/polypropylene composites retained 69% of the gross strength and 83% of the net strength. The strength retention of SRPP was highly influenced by the processing parameters, and a notch-insensitive composite could be produced. Pseudo-ductility was obtained even with the notched hybrids. Hybrids that do not achieve the optimal ductility, still exhibit high gross and net strength retentions and can be classified as notch-insensitive. These results illustrate the significant potential of this new hybrid composite for applications with notches or holes.

中文翻译：

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混合碳纤维/自增强聚丙烯复合材料的缺口敏感性

摘要 结合脆性和韧性增强纤维的混合复合材料可以通过控制其失效机制来设计为具有假韧性行为。最近开发的碳纤维/自增强聚丙烯 (SRPP) 混合材料展示了刚度 (7 GPa)、韧性 (>6% 应变) 和密度 (±1000 kg/m³) 的独特组合。在这里，研究了圆形缺口对其失效机制的影响。不连续的碳纤维/聚丙烯复合材料保留了 69% 的总强度和 83% 的净强度。SRPP 的强度保持率受加工参数的影响很大，可以生产出缺口不敏感的复合材料。即使使用带缺口的混合体也获得了假延展性。未达到最佳延展性的混合体，仍然表现出较高的总强度和净强度保留率，可以归类为缺口不敏感。这些结果说明了这种新型混合复合材料在具有凹口或孔洞的应用中的巨大潜力。