Measurement of strain in fabrics under ballistic impact using embedded nichrome wires. Part I: Technique

Chocron, Sidney; Samant, K. R.; Nicholls, Arthur E.; Figueroa, Eleonora; Weiss, Carl E.; Walker, James D.; Anderson, Charles E.

doi:10.1016/j.ijimpeng.2009.04.004

Cited by 20 publications

(21 citation statements)

References 16 publications

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“…The NiCr wire technique is described in [1]. The NiCr wires constitute one of the arms of a Wheatstone bridge (120 Ω).…”

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

“…Local strain in the fabric was inferred from the equation derived in [1] that relates local strain with the slope of the signal of the NiCr wire:…”

Section: Strain Distribution As a Function Of The Layer Number 321 mentioning

confidence: 99%

“…Details of the technique are described in [1]. This paper focuses on using the technique, combined with a variety of other diagnostic techniques (ash radiography, high-speed video, and ultra-high-speed imaging), to study the response of ballistic fabric to impact.…”

Section: Introductionmentioning

confidence: 99%

“…Of course, the strain in the fabric depends on time and position, and the NiCr wire technique is limited to very early time or very late time [1]. Nevertheless, the information that can be obtained can improve our understanding of what is happening in the fabric at the yarn level, as well as provide results useful for validation of numerical or analytical models.…”

Section: Introductionmentioning

confidence: 99%

“…

AbstractA 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.

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confidence: 99%

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

Chocron

Anderson

Samant

et al. 2010

International Journal of Impact Engineering

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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.

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“…The NiCr wire technique is described in [1]. The NiCr wires constitute one of the arms of a Wheatstone bridge (120 Ω).…”

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

“…Local strain in the fabric was inferred from the equation derived in [1] that relates local strain with the slope of the signal of the NiCr wire:…”

Section: Strain Distribution As a Function Of The Layer Number 321 mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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

Chocron

Anderson

Samant

et al. 2010

International Journal of Impact Engineering

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Real-time Measurement of Projectile Velocity in a Ballistic Fabric with a High-frequency Doppler Radar

et al. 2020

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Background Because of technical limitations, most experimental studies on the energy-absorbing properties of ballistic fabrics are limited to discrete evaluations based on impact and residual velocities. Consequently, the continuous interaction between a projectile and a target material is still commonly assessed with analytical models or numerical simulations, the validation of which is based on the aforementioned discrete values. Objective The present document aims at describing and validating a new experimental method to make it possible to evaluate the continuous evolution of the projectile velocity during penetration into a fabric material. The method is based on the Doppler effect and a specific and complex nonstationary signal treatment. Methods A high-frequency continuous-wave Doppler radar was adapted to assess the continuous evolution of the velocity of a projectile penetrating a fabric material. Based on two ballistic-grade fabric configurations, a perforating and a nonperforating case were described and evaluated. The instantaneous Doppler frequency was extracted based on the Hilbert-Huang transform. A validation of the proposed method was performed based on high-speed camera images, giving the displacement of the apex of the deformation pyramid of the fabric with time. Additionally, a Weibel® Doppler radar was used to measure the impact velocity. Results Based on instantaneous frequencies deduced from the high-frequency radar signal analysis, Doppler theory and highspeed camera images, velocity-time and displacement-time plots were obtained. Additionally, the evolution of the fabric deformation (pyramid morphology) was recorded from the high-speed camera images. Conclusions Comparisons between the data assessed with the high-frequency Doppler radar and those deduced from the highspeed camera indicated that good agreement exists between the two methods. The new Doppler radar method seems to be a promising complementary tool for measuring the continuous interaction between a projectile and a fabric target material.

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Modelling of 3D woven fabrics for ballistic protection

2016

Advanced Fibrous Composite Materials for Ballistic Protection

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Measurement of strain in fabrics under ballistic impact using embedded nichrome wires. Part I: Technique

Cited by 20 publications

References 16 publications

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

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

Real-time Measurement of Projectile Velocity in a Ballistic Fabric with a High-frequency Doppler Radar

Modelling of 3D woven fabrics for ballistic protection

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