Research on the Structural Characteristics and the Fracture Resistance Mechanism of the Primary Flight Feather Shaft in Vulture.

IF 2.1 3区工程技术 Q2 ANATOMY & MORPHOLOGY

Microscopy Research and Technique Pub Date : 2026-09-28 DOI:10.1002/jemt.70184

Liyan Wu, Huitong Ma, Yuliang Huang, Fangming Cui, Cuihong Liu, Yuqiu Song, Huan Wang, Mingjin Xin

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引用次数: 0

Abstract

The primary flight feather shaft (PFF) plays a crucial role in adjusting avian's flight posture and flight speed while bearing intense aerodynamic force, and it demonstrates exceptional mechanical properties and fracture resistance. The influence of the structure of a PFF on its fracture resistance mechanism (including crack initiation resistance and crack propagation resistance) remains unclear. This study focused on the research subject of the PFF of Aegypius monachus (cinereous vulture) and the impact of the macro/microstructural characteristics and components on the fracture resistance mechanism. The results showed that the variation in cross-sectional shape (from circular to square) enhanced the bending stiffness of the PFF. The PFF exhibited a maximum compressive stress of 28.85 ± 0.91 MPa and a maximum tensile strength of 51.59 ± 4.43 MPa. Layered fibers and the bridging structure between fibers inhibited crack initiation and propagation. The medullary foam was composed of closed-cell porous units, which reduced the overall weight of the PFF and absorbed external mechanical energy. The cuticle layer contained 5.97 wt% sulfur (S) and abundant cysteine disulfide bonds, which endowed the PFF surface with high rigidity and inhibited crack generation. This study reveals the influence of structural characteristics of vulture PFF on its fracture resistance mechanism and provides inspiration for the design of bioinspired lightweight composite structures.

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秃鹫主飞羽轴结构特性及抗断裂机理研究。

主飞羽轴在承受强大气动力的同时，对调节鸟类的飞行姿态和飞行速度起着至关重要的作用，具有优异的力学性能和抗断裂性能。PFF的结构对其抗断裂机制（包括抗裂纹起裂和抗裂纹扩展）的影响尚不清楚。本研究以埃及秃鹫（Aegypius monachus）的PFF为研究对象，探讨其宏观/微观结构特征和组成对其抗断裂机制的影响。结果表明，截面形状的变化（从圆形到方形）提高了PFF的抗弯刚度。PFF的最大压应力为28.85±0.91 MPa，最大抗拉强度为51.59±4.43 MPa。层状纤维和纤维间的桥接结构抑制了裂纹的萌生和扩展。髓质泡沫由闭孔多孔单元组成，减轻了PFF的整体重量，吸收了外部机械能。角质层含有5.97 wt%的硫(S)和丰富的半胱氨酸二硫键，使PFF表面具有高刚性，抑制了裂纹的产生。本研究揭示了秃鹰PFF结构特性对其抗断裂机理的影响，为仿生轻质复合材料结构的设计提供了启示。

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来源期刊

Microscopy Research and Technique 医学-解剖学与形态学

CiteScore

5.30

自引率

20.00%

发文量

233

审稿时长

4.7 months

期刊介绍： Microscopy Research and Technique (MRT) publishes articles on all aspects of advanced microscopy original architecture and methodologies with applications in the biological, clinical, chemical, and materials sciences. Original basic and applied research as well as technical papers dealing with the various subsets of microscopy are encouraged. MRT is the right form for those developing new microscopy methods or using the microscope to answer key questions in basic and applied research.