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International Journal for Multiscale Computational Engineering
Impact-faktor: 1.016 5-jähriger Impact-Faktor: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Druckformat: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v7.i4.50
pages 295-308

Modeling of Viscoelastic Behavior of Ballistic Fabrics at Low and High Strain Rates

N. V. David
Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA
Xin-Lin Gao
Texas A&M University
J. Q. Zheng
Program Executive Office-Soldier, U.S. Army, Haymarket, VA 20169, USA

ABSTRAKT

Ballistic fabrics are made from high-performance polymeric fibers such as Kevlar®, Twaron®, and Spectra® fibers. These fibers often behave viscoelastically. The Kelvin-Voigt and Maxwell rheological (viscoelasticity) models have been used to characterize stress-strain relations of such fabrics at different strain rates. However, these two-parameter models have been found to be inadequate and inaccurate in some applications. As a result, three-parameter rheological models have been utilized to develop constitutive relations for viscoelastic polymeric fabrics. In this article, a generalized Maxwell (GM) model and a generalized Kelvin-Voigt (GKV) model, which are both three-parameter viscoelasticity models, are proposed to describe the viscoelastic behavior of a ballistic fabric, Twaron® CT716, at the strain rates of 1 s-1 and 495 s-1. The GM model consists of a Maxwell element (including a viscous dashpot and a spring in series) and a second spring in parallel to the Maxwell element, while the GKV model is an assembly of a Kelvin-Voigt (KV) element (containing a viscous dashpot and a spring in parallel) and a second spring in series with the KV element. The predictions by the GM and GKV models are compared with existing experimental data, which reveals that the GKV model gives more accurate results at the low strain rate, whereas the GM model performs better at the high strain rate while still providing accurate predictions for the low strain rate responses.

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