USA As Represented by Secretary of the Navy

E.i. Dupont De Nemours and Company

Alyssa Littlestone

Philip John Dudt

Charles M Roland

Roshdy Barsoum

Bryce Vanarsdalen

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.

Blast and ballistic improvement in helmets

A lightweight armor for resisting penetration by both fragments and high velocity sharply pointed projectiles. The lightweight armor includes a slide region and a receiving region, with the slide region having a backing material coated with polyurea to slidably redirect projectiles towards the receiving region, which may include high strength thickened projectile stopping materials.

Lightweight armor with slide region for slidably redirecting projectiles

A composite panel includes a ballistic fabric strike surface layer and an underlying structural armor plate layer. The structural armor plate layer is corrugated and includes a multiplicity of traversing ports. The traversing ports have sufficient lateral area to allow explosive blast deformation of the ballistic fabric through the structural armor plate layer. By selecting both relative port traversing void area and corrugation angle an effective projectile blockage is achieved. The composite shield is particularly effective in protecting personnel. Blast frequencies in the 1000 to 3000 Hz Cooper Injury Range component of the blast wave spectrum are attenuated. The panel has projectile shredding properties and has improved structural stability.

Corrugated blast frequency control panel and method

A composite shield comprises a panel including an outer ballistic fabric strike surface layer and an inner structural armor plate layer. The structural armor plate layer has a multiplicity of traversing ports. The traversing ports have sufficient lateral area to allow deformation of the ballistic fabric through the structural armor plate layer on the occurrence of explosive blast. The composite shield is particularly effective in protecting personnel. Blast frequencies in the damaging 1000 to 3000 Hz range are attenuated.

Explosive blast frequency control shield and method

A composite shield comprises a panel including an outer thin metallic strike surface layer, a highly strain rate hardening polymer layer and an inner structural armor plate layer. The structural armor plate layer has a multiplicity of traversing ports. The traversing ports have sufficient lateral area to allow deformation of the thin metallic strike surface layer and highly strain rate hardening polymer layer through the structural armor plate layer on the occurrence of explosive blast.

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Washington, DC, United States of America

Alyssa Littlestone