Measurement of strain in fabrics under ballistic impact using embedded nichrome wires, part II: Results and analysis

Abstract

A new technique using nickel-chromium wire, called the NiCr (Nichrome R ) wire technique, has been presented in a rst paper describing the technique [1]. This second paper focuses on the results obtained when this new technique is applied to ballistic fabrics. Strain distributions on the layer impacted, as well as in dierent layers, are presented. An energy balance based on the strains is shown to provide reasonable values for the elastic energy stored by the yarns. Failure times of the rst layer as a function of impact velocity are discussed and a simple momentum balance is shown to predict well the deection history of the fabric. Ultra-high-speed photography and high-speed videos allowed recording of fabric deection vs. time.The combination of the four diagnostic techniques, including X-rays, delivers a very complete picture of the impact mechanics in fabrics, both for early-time and latetime phenomena.

Recent advances in modeling and experiments of Kevlar ballistic fibrils, fibers, yarns and flexible woven textile fabrics – a review

“…. A similar explanation is provided by Chocron et al 37,38 based on their measured strains in the secondary yarns consistent with Cunniff's description. They measured strains in a multi-layer Kevlar fabric during ballistic impact by embedding Nickel-Chromium (NiCr) wires in the secondary yarns.…”

Ballistic performance of p-aramid fabrics impregnated with shear thickening fluid; Part I – Effect of laminating sequence

“…The following describes how we combined the data from this study to calculate the possible maximum tensile dissipation of a multilayer panel. Chocron et al 17,18 has experimentally shown that the local strain in the yarn depends on the impact velocity while it is much less dependent on the layer number. They have also shown that the initiation of an elongational event at early time of impact occurs at a regular interval of time, which is the time needed for the compression wave created by the bullet to reach the adjacent layer.…”

Parameters influencing the impact response of fiber-reinforced polymer matrix composite materials: A critical review

“…On the experimental part, several investigations have been conducted to investigate lowvelocity and ballistic impact response of yarns, 1D, 2D and 3D fabrics [48,[72][73]. Figure 6 depicts different damage modes for various fiber architecture of composites.…”