Description
Molecular dynamics and finite element simulations are performed to study the surface instability in polymeric nanofibers under uniaxial tension. A polymeric nanofiber is modeled as a core-shell structure, which has been observed from molecular simulations and experiments. The surface instability of the polymeric nanofiber is found, via finite element simulations and a continuum theory, to be governed by the “polarization” at the core-shell interphase, ultimately being induced by the mismatch between their Poisson’s ratios. Without considering the plastic deformation, the initial imperfections cannot lead to a rippled surface of the polymeric nanofiber under uniaxial tension. It is shown that the strain rate and yield stress greatly influence the onset and modes of the observed rippled surface.
Recommended Citation
Li, Y. (2014). Mechanistic understanding of surface instability in polymeric nanofibers under tension. In A. Bajaj, P. Zavattieri, M. Koslowski, & T. Siegmund (Eds.). Proceedings of the Society of Engineering Science 51st Annual Technical Meeting, October 1-3, 2014 , West Lafayette: Purdue University Libraries Scholarly Publishing Services, 2014. https://docs.lib.purdue.edu/ses2014/mss/nanobio/6
Mechanistic understanding of surface instability in polymeric nanofibers under tension
Molecular dynamics and finite element simulations are performed to study the surface instability in polymeric nanofibers under uniaxial tension. A polymeric nanofiber is modeled as a core-shell structure, which has been observed from molecular simulations and experiments. The surface instability of the polymeric nanofiber is found, via finite element simulations and a continuum theory, to be governed by the “polarization” at the core-shell interphase, ultimately being induced by the mismatch between their Poisson’s ratios. Without considering the plastic deformation, the initial imperfections cannot lead to a rippled surface of the polymeric nanofiber under uniaxial tension. It is shown that the strain rate and yield stress greatly influence the onset and modes of the observed rippled surface.