Blast and ballistic improvement in helmets
AssigneesE. I. Du Pont de Nemours and Company, The United Sates of America as represented by the Secretary of the Navy
InventorsBryce Vanarsdalen, Philip Dudt, Roshdy G Barsoum, Alyssa Littlestone, Charles M Roland
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Abstract
A composite article having blast and ballistic resistance suitable for helmets, personal protection and hard armor applications comprises a high-strain hardening elastomeric layer and a layer of continuous yarns having a tenacity of 15 grams per dtex and a modulus of at least 500 grams per dtex or an oriented polyethylene sheet layer having a modulus ten times greater in one direction than in another direction.
Claims12
A composite article having improved blast resistance and ballistic resistance comprising
- (i) a first explosion resistant component facing a blast or ballistic source comprising a strain rate hardening elastomeric layer having a Young's modulus of from 7000 to 20000 psi at 100% strain and a strain-rate-sensitivity hardening in the strain rate range of approximately 1000/second to 1,000,000/second in association with a ballistic and/or explosive event, and
- (ii) a second ballistic-resistant component facing an article to be protected comprising at least one layer comprising continuous filament yarns impregnated or coated with resin or a non-filamentary oriented polyethylene layer and the second ballistic-resistant component is a helmet shell,
- wherein
- the continuous filament yarns have a tenacity of at least 15 grams per dtex and a modulus of at least 500 grams per dtex and the oriented polyethylene layer has a modulus in a first direction that is at least ten times greater than the modulus in a second direction.
Dependencies are inferred from the claim text.