Impact force loss behavior of flocked surfaces

The impact force loss behavior of flocked energy absorbing materials (FEAM) was experimentally studied in the context of double-side flocked FEAM element layered structures. A ball drop test determined the force loss per cent (FL%) properties of various assembled panels. This study showed that: (a)...

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Veröffentlicht in:Textile research journal 2018-02, Vol.88 (4), p.392-412
Hauptverfasser: Lewis, Armand F, Matos, Helio, Rice, John M, Kim, Yong K
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container_title Textile research journal
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creator Lewis, Armand F
Matos, Helio
Rice, John M
Kim, Yong K
description The impact force loss behavior of flocked energy absorbing materials (FEAM) was experimentally studied in the context of double-side flocked FEAM element layered structures. A ball drop test determined the force loss per cent (FL%) properties of various assembled panels. This study showed that: (a) FEAM layers are most effective when used in multiple layer configurations. (b) When fabricating multi-layer two-side flocked FEAM layer configurations, a film or fabric divider sheet should be placed between adjacent flocked layers to prevent the flocked fibers from intermeshing with each other during compressional deformation. (c) FEAM elements perforated with 6.4 mm (¼”) diameter holes, 12.7 mm (½”) off staggered centers, exhibit a higher FL% per areal density compared to non-perforated FEAM panels. (d) Promising improvements in FL% properties are found by sandwiching either foam or spacer fabric between two FEAM layers. These three-layer structures are found to have higher FL% values than individual foam or spacer fabric components. A possible synergistic effect might be operating. (e) Low strain rate (5 and 50 mm/min) compressional load deflection rate data on combination FEAM/ vinyl nitrile foam/FEAM layers have shown that the initial ‘hump’ in the foam’s stress–strain curve is eliminated. FEAM layers and their foam and spacer fabric combinations should lead to creating effective impact energy absorbing pads for sport, military and civil servant applications.
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subjects Authorship
Configurations
Deformation
Energy
Energy absorption
Fabrics
Football
Helmets
Ice hockey
Impact loads
Impact tests
Injuries
Load distribution
Materials research
Military applications
Panels
Strain rate
Studies
Synergistic effect
Tension tests
Textile fibers
title Impact force loss behavior of flocked surfaces
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