Measuring flexural rigidity of mullite microfibers using magnetic droplets
Abstract
Flexural rigidity of many microfibers is known to deviate from the Bernoulli-Euler predictions that neglect shear deformations. We examine mullite microfibers formed by electrospinning of sol-gel precursors. The formed fibers have diameters smaller than 10 μm. A magnetic drop was placed on the free end of a dangling fiber, and the fiber was flexed by applying a non-uniform magnetic field. By applying different magnetic fields, we generated a series of different fiber profiles and filmed the process of fiber bending. Mullite microfibers were found to follow the Bernoulli-Euler predictions, and the shear deformations in the material were insignificant. This was confirmed by employing the Euler elastica model to describe the fiber profiles. The bending test provided a Young modulus of E = 100 GPa, which appeared to be very close to that found from the tensile test.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 01, 2015
- Source ID
- 10.1063/1.4921881
Entities
People
- Fei Peng
- Igor Luzinov
- Konstantin G Kornev
- Yu Gu
- Zhao Zhang
- Zhaoxi Chen
Organizations
- Air Force Office of Scientific Research
- Clemson University