Resistance to penetration and compression of fibre-reinforced composite materials

Woodward, R. L.; Egglestone, G. T.; Baxter, B.J.; Challis, K. E.

doi:10.1016/0961-9526(94)90083-3

Cited by 31 publications

(16 citation statements)

References 8 publications

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“…While the mechanics underlying the hypothesis of Woodward et al [48] are not clear, the sequence of events leading to failure suggested by Woodward et al [48] more closely resembles the observations of Karthikeyan et al [30].…”

Section: Impact Response Of Polymer Matrix Compositessupporting

confidence: 52%

“…epoxy). In these brittle composite systems, cone cracks develop below the projectile by a shear mechanism [30,48,53]. Indentation and ballistic impact experiments [30,48,54] with flat nose and spherical nosed loading surfaces expose a clear difference in penetration induced failure between the two systems, where no shear plug is created when a flexible polymer fiber reinforced composite (like those reinforced with UHMWPE fibers) fails under a ballistic impact loading.…”

Section: Impact Response Of Polymer Matrix Compositesmentioning

confidence: 99%

“…The deflection of the primary fibers also induces transverse motion (and straining) of 'secondary' fibers (those not directly beneath the projectile This progressive mechanism of penetration is often observed during high velocity impact of edge restrained panels [27,30,38,[44][45][46], and it is especially evident for very thick panels impacted at zero obliquity [47]. Woodward et al [48] have suggested an alternate failure mechanism for fiber composites by investigating their response under indentation type loading. They argue that the compressed laminate under the indenter is stretched but unable to flow laterally (confined) due to the surrounding laminate material.…”

Section: Impact Response Of Polymer Matrix Compositesmentioning

confidence: 99%

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Mechanisms of Dynamic Deformation and Failure in Ultra-High Molecular Weight Polyethylene Fiber-Polymer Matrix Composites

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i Ultra-high molecular weight polyethylene (UHMWPE) molecules, with molecular weights approaching 10 7 Da and lengths approaching 10 μm, can be gel spun and drawn into highly crystalline fibers with more than 95% of the molecules oriented in the fiber direction. The very high tensile strength (approaching 4 GPa) and elastic modulus (200 GPa) combined with a very low density (970 kg m -3 ) result in a fiber with very high specific strength and modulus. While the strength per unit mass of the materials in the fiber direction is ~25 times greater than that of conventional steels, weak (van der Waals) bonds between molecules leads to strengths transverse to the fibers of only a thousandth that in the fiber direction. This weak intermolecular strength also leads to creep deformation under prolonged loading at ambient temperatures, and complete failure of the polymer when the intermolecular bonds "melt" at 155°C. These materials are therefore used in weight sensitive applications, where a high uniaxial stress must be supported for relatively short periods of time. Examples include mooring cables, the sails of racing ships and ballistic impact protection panels. For ballistic applications, the The dissertation also investigated the mechanisms of projectile penetration during impact of UHMWPE fiber-reinforced composites with a spherical projectile using model targets designed to dynamically load the laminates in different ways. The response of the samples were studied using a combination of synchronized high speed photography with three cameras, and 3D digital image correlation together with post-test characterization via X-ray tomography and optical microscopy. It was found that a rear supported laminate, which was prevented from deflecting, was progressively penetrated by the projectile. Since the projectile applied only a compressive pressure to the laminate, it is To my wife, Brenna, you have sacrificed more than anyone in this pursuit. I can never repay all that you have given, your love, affection, advice and support, and all of the sleep, weekends and time apart (both physically and mentally) that we have lost. Igive you my deepest and most humble thank you.

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Section: Impact Response Of Polymer Matrix Compositessupporting

confidence: 52%

Section: Impact Response Of Polymer Matrix Compositesmentioning

confidence: 99%

Section: Impact Response Of Polymer Matrix Compositesmentioning

confidence: 99%

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Mechanisms of Dynamic Deformation and Failure in Ultra-High Molecular Weight Polyethylene Fiber-Polymer Matrix Composites

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“…A progressive mechanism of penetration is often observed during high velocity impact of edge restrained panels [6,[11][12][13][14][15], and it is especially evident when back supported, or very thick panels, are impacted at zero obliquity [1,[16][17][18]. In these cases, the laminates are unable to deflect out of plane, and instead, an impact pressure dependent mode of penetration occurs [12,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…However, a variety of recent experiments has identified a weaker mechanism of panel response that appears to govern the initial interaction of the projectile with such a target [1,[6][7][8][9][10]. A progressive mechanism of penetration is often observed during high velocity impact of edge restrained panels [6,[11][12][13][14][15], and it is especially evident when back supported, or very thick panels, are impacted at zero obliquity [1,[16][17][18]. In these cases, the laminates are unable to deflect out of plane, and instead, an impact pressure dependent mode of penetration occurs [12,16,17].…”

Section: Introductionmentioning

confidence: 99%

Ballistic impact response of an UHMWPE fiber reinforced laminate encasing of an aluminum-alumina hybrid panel

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Compton

Gamble

et al. 2015

International Journal of Impact Engineering

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A B S T R A C TThe impact response of an ultrahigh molecular weight polyethylene (UHMWPE) fiber reinforced polymer matrix composite laminate has been investigated. The laminate encapsulated an aluminum alloy sandwich panel whose corrugated core was filled with prismatic alumina inserts. The laminate encased hybrid core target could sustain ceramic prism base impacts by a spherical, 12.7 mm diameter steel projectile with velocities in excess of 2.7 km s −1 . This was 150% higher than the ballistic limit of an equal areal density, similarly encapsulated aluminum plate target. By contrast, when the projectile impacted a hybrid core target at the apex of a ceramic prism insert, failure of the UHMWPE laminate on the rear face occurred at a lower impact velocity. High-speed imaging, three-dimensional digital image correlation and x-ray tomography measurements are used to show that upon impact the projectile and the ceramic insert fragment. These fragments then load the UHMWPE laminate on the rear face with a significantly reduced pressure compared to the impact pressure of the projectile on the front surface of the target. The loading area on the inner surface of the rear laminate was highest for a prism base impact and lowest for a prism apex impact. The inability to penetrate the rear laminate of the base impacted samples is consistent with the recent identification of an impact pressure controlled mechanism of progressive penetration in this class of laminate.

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et al. 2017

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Resistance to penetration and compression of fibre-reinforced composite materials

Cited by 31 publications

References 8 publications

Mechanisms of Dynamic Deformation and Failure in Ultra-High Molecular Weight Polyethylene Fiber-Polymer Matrix Composites

Mechanisms of Dynamic Deformation and Failure in Ultra-High Molecular Weight Polyethylene Fiber-Polymer Matrix Composites

Ballistic impact response of an UHMWPE fiber reinforced laminate encasing of an aluminum-alumina hybrid panel

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