Abstract The inherent brittleness of conventional high-performance composites can be addressed by the use of discontinuous fibres or hybridisation of fibre-types. In this paper, we propose the first models in the literature to predict the stress-strain curve of hybrid discontinuous composites, with either a brick-and-mortar or an intermingled-fibre microstructure. The models consider a shear-lag stress-transfer between the hybrid reinforcement units, and show that this stress transfer becomes less efficient with hybridisation. The model for intermingled-fibre hybrids also considers stochastic fibre strengths and fibre fragmentation, and can therefore predict a brittle or pseudo-ductile response of hybrid discontinuous composites as observed experimentally, as well as hybrid effects. These models can be used to perform virtual testing and microstructural design of hybrid aligned discontinuous composites.

中文翻译：

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混合排列不连续复合材料的虚拟测试框架

摘要 传统高性能复合材料的固有脆性可以通过使用不连续纤维或混合纤维类型来解决。在本文中，我们提出了文献中的第一个模型来预测具有实体或混合纤维微观结构的混合不连续复合材料的应力 - 应变曲线。模型考虑了混合增强单元之间的剪切滞后应力传递，并表明这种应力传递在混合时效率较低。混合纤维混合模型还考虑了随机纤维强度和纤维碎裂，因此可以预测实验观察到的混合不连续复合材料的脆性或伪延性响应，以及混合效应。