Feathers are lightweight, flexible structures that play an important role in bird flight. They are composed of a series of interlocking barbs that are connected to a central shaft. The shape of the shaft is critical for the feather's ability to withstand the forces of flight.
Previous research has shown that the shaft of a feather changes shape when it is subjected to stress. However, the exact mechanism behind this change in shape was not known.
The new study, published in the journal "Nature Communications," reveals that the change in shape is due to the way that the barbs are attached to the shaft. When the shaft is under stress, the barbs rotate and slide, causing the shaft to bend.
The researchers used a combination of experiments and computer modeling to study the mechanics of feather shafts. They found that the shape of the shaft depends on the angle at which the barbs are attached to the shaft, as well as the stiffness of the barbs and the shaft.
This research could lead to the development of new bio-inspired materials that are strong, lightweight, and flexible. These materials could be used in a variety of applications, such as aerospace, automotive, and sports equipment.
In addition to its potential applications in engineering, the study also provides new insights into the evolution of feathers. The researchers believe that the ability of feathers to change shape under stress may have played a role in the evolution of bird flight.
