Mechanical Property Experiments with Ultra-High Strength Micrometer Scale Fibers

K. Şahin, N. A. Fasanella, P. V. Kolluru, I. Chasiotis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Recent advances in materials synthesis have resulted in the development of continuous carbon fibers with one micron diameter and tensile strengths exceeding 5 GPa. Mechanical experiments on such strong fibers with very small diameters require tensile forces of the order of 5 mN or larger, which presents a major challenge to surface micromachined MEMS–based methods, while making rather impractical the use of existing macroscale methods for fiber testing. The application of large forces results in nonlinear response and out-of-plane deflections of surface micromachined MEMS. Furthermore, existing means for attaching high strength microscale fibers to MEMS can bias the measurement of the mechanical strength or the elastic modulus. This study addresses these issues via the design of microscale mechanical testing devices with a full-range linear response for several microNewtons of applied force, while also employing a new compliant gripping method, which eliminates specimen sliding or failure initiation of high strength fibers at the grips. With this new method, high strength carbon fibers of 1 μm diameter, reinforced with carbon nanotubes, were 100 % successfully tested. Notably, the fiber strength measured with the new compliant gripping method which averted fiber failure at the grips, was 20 % higher than that measured using the prior state-of-the-art approach for fiber gripping via Pt deposition by a focused ion beam.

Original languageEnglish
Pages (from-to)877-885
Number of pages9
JournalExperimental Mechanics
Volume55
Issue number5
DOIs
Publication statusPublished - 1 Jun 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015, Society for Experimental Mechanics.

Funding

FundersFunder number
Defense Advanced Research Projects AgencyW911NF-10-1-0098

    Keywords

    • Carbon fibers
    • Compliant gripping
    • Ion beam Pt deposition
    • MEMS
    • Microscale testing

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