Hybrid composites allow avoiding catastrophic failure, a key limitation of composite materials, and can provide a balanced suite of modulus, strength and ductility. The aim of this research is to manufacture hierarchical hybrid composites using a combination of continuous high elongation fibres and intermingled hybrids made out of highly aligned discontinuous fibres with lower elongation to achieve pseudo-ductility through control of failure development. The HiPerDiF (High Performance Discontinuous Fibres) method that allows a high level of fibre alignment, leading to excellent mechanical properties close to continuous fibre composites, was used to produce the intermingled hybrid discontinuous fibre preforms. The hierarchical hybrid composite configuration is composed of an intermingled hybrid discontinuous fibre layer sandwiched between continuous S-glass layers. The overall stress-strain response of the intermingled hybrid composites and the hierarchical hybrid composites was investigated for different fibre types and ratios. The analytical modelling approach previously developed by the authors for interlaminated hybrid composites was modified for this new type of hierarchical composite. The experimental results were analysed and the analytical model was used to evaluate the optimised balance of constituents to maximise pseudo-ductile strain in tension.

混合复合材料可以避免灾难性破坏，这是复合材料的关键局限，并且可以提供一组平衡的模量，强度和延展性。这项研究的目的是使用连续的高伸长率纤维和由具有较低伸长率的高度排列的不连续纤维制成的混合混杂物的组合来制造分层混合复合材料，以通过控制失效发展来实现假延性。HiPerDiF（高性能不连续纤维）方法可实现高水平的纤维排列，从而导致接近连续纤维复合材料的优异机械性能，被用于生产混杂的混合不连续纤维预成型坯。分层混合复合结构由夹杂在连续S玻璃层之间的混合不连续纤维层组成。对于不同的纤维类型和比例，研究了混合混杂复合材料和分层混杂复合材料的整体应力应变响应。作者先前为层间混合复合材料开发的分析建模方法已针对这种新型的分层复合材料进行了修改。分析了实验结果，并使用分析模型评估了成分的最佳平衡，以使张力中的假延性应变最大化。作者先前为层间混合复合材料开发的分析建模方法已针对这种新型的分层复合材料进行了修改。分析了实验结果，并使用分析模型评估了成分的最佳平衡，以使张力中的假延性应变最大化。作者先前为层间混合复合材料开发的分析建模方法已针对这种新型的分层复合材料进行了修改。分析了实验结果，并使用分析模型评估了成分的最佳平衡，以使张力中的假延性应变最大化。