@Article{cmes.2021.015426,
AUTHOR = {Yichen Lu, Zongning Chen, Enyu Guo, Xiangqing Kong, Huijun Kang, Yanjin Xu, Rengeng Li, Guohua Fan, Tongmin Wang},
TITLE = {Micro Hierarchical Structure and Mechanical Property of Sparrow Hawk (<i>Accipiter nisus</i>) Feather Shaf},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {127},
YEAR = {2021},
NUMBER = {2},
PAGES = {705--720},
URL = {http://www.techscience.com/CMES/v127n2/42223},
ISSN = {1526-1506},
ABSTRACT = {In this study, the real 3D model of the feather shaft that is composed of medulla and cortex is characterized by X-ray
computer tomography, and the structural features are quantitatively analyzed. Compression and tensile tests are
conducted to evaluate the mechanical performance of the feather shaft and cortex at different regions. The analysis
of the 3D model shows that the medulla accounts for ∼70% of the shaft volume and exhibits a closed-cell foam-like
structure, with a porosity of 59%. The cells in the medulla show dodecahedron and decahedron morphology and
have an equivalent diameter of ∼30 μm. In axial compression, the presence of medulla enhances the shaft stability.
Especially, the combined effect of the medulla and cortex increases the buckling strength of the middle and distal
shaft by 77% and 141%, respectively, compared to the calculated value of the shaft using linear mixed rule. The
tensile properties of the cortex along the shaft axis are anisotropic because of the different fiber structures. As the
fiber orientation gradually becomes uniform in the axial direction, the Young’s modulus and tensile strength of
the cortex on the dorsal gradually increase from calamus to the distal shaft, and the fracture mode changes from
tortuous fracture to V-shaped fracture. The cortex on the lateral shows the opposite trend, that is the distal shaft
becomes weaker due to fiber tangles.},
DOI = {10.32604/cmes.2021.015426}
}