The biocompatible and biodegradable silks, have become promising fibre reinforcements for composites owning to their high toughness and specific strength. As dozens of silk fibre type exist, comprehensive understanding and comparison of their characteristics are crucial for fibre selection, and the hybrid of different silk fibres may provide better overall characteristics and open up new opportunities for their applications. This paper focused on the properties of Bombyx (BM) and Antheraea Pernyi (AP) silk fibre hybrid composites. Their mechanical and thermal properties, as well as the temperature influence from −50–60 °C were investigated. From experimental results, more BM silk fibres provided higher modulus and strength, while higher AP silk content could improve the impact toughness for silk fibre composites (SFCs) in general. Additionally, all mechanical properties of SFCs showed greater sensitivity to temperature change as the increase of AP silks within the composites on the whole. Damage mechanism studies demonstrated the hierarchical micro-fibre slippage and dissociation of AP silk fibres during their fracture process, which could promote the energy absorption during composite mechanical testing, and these mechanisms were more notable as temperature rose. In summary, the hybrid 8AP+ 4BM SFCs exhibited more favourable performance than both pure AP and BM SFCs, with tensile strength, modulus and impact strength reaching 96 MPa, 5.4 GPa and 64 kJ/m² respectively (at 23 °C), plus the glass transition temperature of 95 °C. It is also expected that greater benefits from fibre hybrid could be achieved with optimised BM/AP ratio and the stacking sequence.

中文翻译：

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Bombyx Mori 和 Antheraea Pernyi 丝纤维的杂化效应对其复合材料特性的影响

生物相容性和可生物降解的丝绸因其高韧性和特定强度而成为有前途的复合材料纤维增强材料。由于存在数十种蚕丝纤维类型，全面了解和比较它们的特性对于纤维选择至关重要，不同蚕丝纤维的混合可能会提供更好的整体特性，并为它们的应用开辟新的机会。本文重点介绍了 Bombyx （BM） 和 Antheraea Pernyi （AP） 丝纤维混合复合材料的性能。研究了它们的机械和热性能，以及 -50-60 °C 的温度影响。从实验结果来看，更多的 BM 丝纤维提供了更高的模量和强度，而较高的 AP 丝含量可以提高丝纤维复合材料 （SFC） 的冲击韧性。此外，随着复合材料内 AP 丝的增加，SFCs 的所有力学性能总体上对温度变化表现出更大的敏感性。损伤机制研究表明，AP 丝纤维在断裂过程中存在分层微纤维滑移和解离，可以促进复合材料力学测试过程中的能量吸收，并且随着温度的升高，这些机制更加明显。综上所述，混合 8AP+ 4BM SFC 的性能优于纯 AP 和 BM SFC，拉伸强度、模量和冲击强度分别达到 96 MPa、5.4 GPa 和 64 kJ/m²（在 23 °C 时），加上 95 °C 的玻璃化转变温度。 此外，还预计通过优化的 BM/AP 比率和堆叠顺序，可以从纤维混合中获得更大的好处。