Abstract

Ductile and damage-tolerant fibers (DDTFs) are desired in aerospace engineering, mechanical engineering, and biomedical engineering because of their ability to prevent the catastrophic sudden structural/mechanical failure. However, in practice, design and fabrication of DDTFs remain a major challenge due to finite fiber size and limited processing techniques. In this regard, animal silks can provide inspirations. They are hierarchically structured protein fibers with an elegant trade-off of mechanical strength, extensibility and damage tolerance, making them one of the toughest materials known. In this article, we confirmed that nanofibril organization could improve the ductility and damage-tolerance of silk fibers through restricted fibril shearing, controlled slippage and cleavage. Inspired by these strategies, we further established a rational strategy to produce polyamide DDTFs by combining electrospinning and yarn-spinning techniques. The resultant polymeric DDTFs show a silk-like fracture resistance behavior, indicating potential applications in smart textile, biomedicine, and mechanical engineering.

Graphic Abstract

中文翻译：

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丝纤维中的纳米原纤维组织对延展性和耐损伤性纤维设计的启示

摘要

在航空航天工程，机械工程和生物医学工程中，要求具有延展性和耐损伤性的纤维（DDTF），因为它们具有防止灾难性的突然的结构/机械故障的能力。然而，实际上，由于有限的纤维尺寸和有限的加工技术，DDTF的设计和制造仍然是主要的挑战。在这方面，动物丝可以提供灵感。它们是层次结构化的蛋白纤维，在机械强度，可扩展性和破坏耐受性之间进行了很好的权衡，使其成为已知的最坚韧的材料之一。在本文中，我们证实了纳米原纤组织可以通过限制原纤剪切，控制滑动和分裂来改善丝纤维的延展性和耐损伤性。受到这些策略的启发，我们进一步建立了一种合理的策略，将电纺和纱线纺丝技术相结合来生产聚酰胺DDTF。所得的聚合物DDTF显示出丝状的抗断裂性能，表明在智能纺织品，生物医学和机械工程中的潜在应用。

图形摘要