STP336: Behavior of Filamentous Materials Subjected to High-Speed Tensile Impact

    Smith, Jack C.
    Polymer Physics Section, National Bureau of Standards, Washington, D. C.

    Fenstermaker, Carl A.
    Polymer Physics Section, National Bureau of Standards, Washington, D. C.

    Shouse, Paul J.
    Polymer Physics Section, National Bureau of Standards, Washington, D. C.

    Pages: 23    Published: Jan 1963


    Abstract

    When a filamentous material is subjected to impact either transversely or longitudinally in tension, a strain wave is produced which propagates along the filament away from the point of impact. For small strain waves, the behavior of the material can be characterized by stress-strain and specific breaking energy data obtained with a transverse impact tester and a rotating disk longitudinal impact tester operating at impact speeds up to 70 m per sec. For large strains the material may be characterized by stress-strain and critical breaking velocity data obtained from photographs of configurations and strain distributions of filaments struck by rifle bullets.

    Impact behavior in textile yarns is illustrated with stress-strain data obtained at strain rates up to 5000 per cent per sec. The critical velocity at which a filament breaks immediately upon transverse or longitudinal impact is discussed theoretically and tested for nylon yarn by transverse impact experiments with rifle bullets. At impact velocities near 600 m per sec the breaking tenacity and breaking elongation for this yarn are much less than the values obtained at conventional strain rates, and there is a marked dependence of breaking time upon the impact velocity. The critical velocity concept is also tested by longitudinal impact tests on copper wire and paper.


    Paper ID: STP42024S

    Committee/Subcommittee: D20.10

    DOI: 10.1520/STP42024S


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