Abstract
Capillary force of a liquid drop embedded in a microfiber has great influence on the mechanics behavior of the microfiber. In this study, we investigated the buckling and finite deformation of a microfiber filled with a droplet. First, the critical load for the buckling of the microfiber was presented under the combined action of the surface tension and Laplace pressure. Both global buckling based on slender rod model and local buckling according to thin shell model has been considered. Then in use of the Mooney-Rivlin model, we calculated the true axial stress of the microfiber, and clearly showed that the microfiber takes a different load carrying capability due to the capillary force. These investigations emphasize the important role of capillary force in microfibers, and the conclusions hold great potentials in micro/nanotechnologies, fabrics, blood vessels, and animal/plant surfaces.
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