Abstract
Abstract Birds have impressive flying abilities in part because of the remarkable structural aspects of their feathers. It is also interesting that a feather has the ability to reconstitute its structural integrity in a convenient and effective way. To reveal this mechanism, separating and recovering processes of neighboring barbs were observed after stretching a barb of an Aquila chrysaetos. Thereafter, a three-dimensional model of barbs was proposed herein. A connecting force in range of 0.47 N/mm to 1.26 N/mm between distal barbules and proximal barbules was quantified by an experimental approach that combined an in situ stretching device and a strain sensor.
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