Effect of strain rate on the mechanical behavior of 10-micron long polymeric nanofibers

Mohammad Naraghi, Ioannis Chasiotis, Yuris Dzenis, Y. Wen, Hal Kahn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The strain rate mechanical behavior of 12-micron long polymeric nanofibers was investigated. Experiments were carried out by a novel method that employs a MEMS-based leaf spring load cell attached to a polymeric nanofiber that is drawn with an external PZT actuator. The elongation of the fiber and the deflection of the load cell were calculated from optical microscopy images by using Digital Image Correlation (DIC) and with 65 nm resolution in fiber extension. The nanofibers were fabricated from electrospun polyacrylonitrile (PAN) with MW = 150,000 and diameters between 300-600 nm. At strain rates between 0.00025 s -1 to 0.025 s-1 the fiber ductility scaled directly with the rate of loading while the tensile strength was found to vary non-monotonically: At 0.00025 s-1 material relaxations allowed for near-uniform fiber drawing with up to 120% ductility and 120 MPa maximum tensile strength. At the two faster rates the tensile strength scaled with the rate of loading but the fiber ductility was the result of a cascade of localized deformations at nanoscale necks with relatively constant wavelength for all fiber diameters.

Original languageEnglish (US)
Title of host publicationResponsive Soft Matter
Subtitle of host publicationChemistry and Physics for Assemblages, Films and Forms
Pages70-76
Number of pages7
StatePublished - Dec 1 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Publication series

NameMaterials Research Society Symposium Proceedings
Volume948
ISSN (Print)0272-9172

Other

Other2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/27/0612/1/06

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Naraghi, M., Chasiotis, I., Dzenis, Y., Wen, Y., & Kahn, H. (2006). Effect of strain rate on the mechanical behavior of 10-micron long polymeric nanofibers. In Responsive Soft Matter: Chemistry and Physics for Assemblages, Films and Forms (pp. 70-76). (Materials Research Society Symposium Proceedings; Vol. 948).