Compressive properties of helmet materials subjected to dynamic impact loading of various energies

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Deutscher übersetzter Titel:Druckeigenschaften von Helmmaterialien, die dynamischer Stoßbelastung verschiedener Stärke ausgesetzt werden
Autor:Gimbel, Genille M.; Hoshizaki, Thomas B.
Erschienen in:European journal of sport science
Veröffentlicht:8 (2008), 6, S. 341-349, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:1746-1391, 1536-7290
DOI:10.1080/17461390802438763
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Erfassungsnummer:PU200911006020
Quelle:BISp

Abstract des Autors

Many helmet safety standards require children’s helmets to be tested using adult-weighted headforms of approximately 5 kg and impact velocities representative of adult anatomy. The purpose of this study was to test the individual and combined effect of variable headform mass and inbound headform velocity on helmet test results. Testing was conducted on sample sections of helmet liner materials commonly used in multi- and single-impact helmets. Three densities of expanded polystyrene and expanded polypropylene were moulded into 2.54-cm thick foam blocks and cut into circular samples with a 5-cm diameter. Each sample was impacted once using an EN 960 magnesium K1A headform of variable mass on a monorail apparatus in the crown position. A total of 25 impact conditions were used: 5 headform masses and 5 inbound velocities. A PCB 203B force sensor collected force data at 20 kHz in the y-axis of the impact and a 1000-Hz low-pass Butterworth filter
was applied during analysis. A three-way analysis of variance revealed significant main effects for headform mass, inbound velocity, and material density on peak linear acceleration (PB0.01). Inbound velocity and headform mass played a significant role in material performance. It is proposed that the headform mass and inbound velocity used in helmet testing protocols be representative of the intended age group to improve the performance range and safety of sport helmets. Verf.-Referat