Experimental Investigation of the High Strain Rate Transverse Compression Behavior of Ballistic Single Fibers

This paper investigates the high strain rate transverse compression behavior of Kevlar ® KM2 and ultra high molecular weight polyethylene Dyneema ® SK76 single fibers widely used in protective components under ballistic and blast loading conditions. The micron scale fibers are compressed at strain r...

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Bibliographic Details
Published in:Journal of dynamic behavior of materials 2017-09, Vol.3 (3), p.474-484
Main Authors: Sockalingam, S., Casem, D., Weerasooriya, T., McDaniel, P., Gillespie, J.
Format: Article
Language:English
Subjects:
Aramid fibers
Atomic force microscopy
Chemistry and Materials Science
Deformation
Fibrillation
Geometric nonlinearity
High strain rate
Kevlar (trademark)
Materials Science
Metallic Materials
Optical fibers
Solid Mechanics
Strain rate
Ultra high molecular weight polyethylene
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Summary:This paper investigates the high strain rate transverse compression behavior of Kevlar ® KM2 and ultra high molecular weight polyethylene Dyneema ® SK76 single fibers widely used in protective components under ballistic and blast loading conditions. The micron scale fibers are compressed at strain rates in the range of 10,000–90,000 s −1 in a small (283 μm) diameter Kolsky bar with optical instrumentation. The nominal stress–strain response of single fibers exhibits nonlinear inelastic behavior under high rate transverse compression. The nonlinearity is due to both geometric and material behavior. The contact area growth at high rates is found to be smaller than at quasi-static loading leading to a stiffer material response at higher rates. The fiber material constitutive behavior is determined by removing the geometric nonlinearity due to the growing contact area. Atomic force microscopy analysis of the compressed fibers indicates less degree of fibrillation at high strain rates compared to quasi-static loading indicating that fibril properties and inter-fibrillar interactions could be strain rate dependent.
ISSN:2199-7446
2199-7454
DOI:10.1007/s40870-017-0126-2