USA As Represented by Secretary of the Navy

Other

Lee R Hardt

Benjamin M Blazek

Donald L Burnett

Robert A Koontz

Josiah S Garfield

Carl A Weinstein

Eric K Wooding

Que T BuiDang

Brian Vance Hays

James E Means

Donald R Burnett

Embodiments are directed to direct impingement cook-off mitigation systems. As assembled, a munition fuzewell is torqued into the aft end of a munition. During a cook-off event, the expanding gases from the booster energetic will burn instead of detonating. The hot expanding booster gases are vented to the munition's main fill energetic causing the main fill energetic to burn concurrently with the booster energetic. The combined expanding gases from both the booster and main fill energetics are then vented through longitudinal vents.

Direct impingement cook-off mechanism and system

Embodiments are directed to first and second structural members that are threadingly-engaged with each other. The first and second structural members are dissimilar strength materials. Each structural member configured with a plurality of threads for the threading engagement. The thread thickness of each thread in the plurality of threads for the first structural member is not equal to the thread thickness of each thread in the plurality of threads for the second structural member.

Biased equivalent strength threaded joint for dissimilar strength structural materials

Embodiments employ venting features and damping components both inside and concentric to a fuzewell to improve munition fuze survivability. Damping components are selected based on their densities and stiffness properties. A shock damping liner with longitudinal grooves is affixed to an inner surface of the fuzewell and envelops the fuze. At least one shock damping collar constrains and attenuates shack experienced by the fuze. A shock damping ring is concentric about the outer surface of the fuzewell and attenuates shock, between the outermost munition system layer (the casing) and the fuzewell. Longitudinal vents in the fuzewell wall and radial apertures oriented transverse to the longitudinal vents are used for off-gassing. The venting and component orientation combination provides increased damping, resulting in impedance mismatches across multiple interface surfaces in the munition, which reduces shock vibrational pressures and stresses transferred to the fuze.

Shock mitigation apparatus and system

The disclosed embodiments are directed to enhancing insensitive munitions performance. Some of the embodiments employ an outgassing pad having unique geometrical configurations, compositions, and positioning. Other embodiments rely on using thermally-releasable components to foster billet expulsion. Additional embodiments combine both aspects into entire cook-off mitigation systems for insensitive munitions improvements.

Cook-off mitigation systems

Embodiments are directed cook-off mitigation systems. As assembled, a munition fuzewell is torqued into the aft end of a munition. The fuzewell is hollow and has an inner and an outer surface. The hollow fuzewell is configured to release during cook-off. Release is assisted by employing a biased equivalent strength threaded release ring concentric about the fuzewell. The biased equivalent strength threaded release ring has a threaded inner surface and a threaded outer surface. The biased equivalent strength threaded release ring's threaded inner surface threadingly-engages with threads on the fuzewell's outer surface. A munition case is concentric about the biased equivalent strength threaded release ring.

Cook-off mitigation system

Embodiments are directed to a vented torque release device having a proximal end, a distal end, an inner surface, and an outer surface. A wall is defined by the inner surface and the outer surface. A plurality of canted holes are axially spaced at equal distance about the outer surface.

Releasable erosion enhancing mechanism

Embodiments are directed to a vented torque release device including hollow fuze well having a proximal end, a distal end, an inner surface, and an outer surface. A wall is defined by the inner surface and the outer surface. A plurality of helical grooves are axially spaced at equal distance about the outer surface.

Embodiments employ venting features and damping components both inside and concentric to a fuzewell to improve munition fuze survivability. Damping components are selected based on their densities, stiffness properties, and material strengths. A shock damping liner with longitudinal grooves is affixed to an inner surface of the fuzewell and envelops the fuze. A biased equivalent strength threaded shock damping ring is concentric about the outer surface of the fuzewell and attenuates shock between the outermost munition system layer (a munition case) and the fuzewell. The damping components' materials, orientations, and structural geometries provide increased damping, resulting in impedance mismatches across multiple interface surfaces in the munition, which reduces shock vibrational pressures and stresses transferred to the fuze.

Shock mitigation systems

Embodiments employ venting features and damping components both inside and concentric to a fuzewell to improve munition fuze survivability. Damping components are selected based on their densities and stiffness properties. A shock damping liner with longitudinal grooves is affixed to an inner surface of the fuzewell and envelops the fuze. At least one shock damping collar constrains and attenuates shock experienced by the fuze. A shock damping ring is concentric about the outer surface of the fuzewell and attenuates shock between the outermost munition system layer (the casing) and the fuzewell. Longitudinal vents in the fuzewell wall and radial apertures oriented transverse to the longitudinal vents are used for off-gassing. The venting and component orientation combination provides increased damping, resulting in impedance mismatches across multiple interface surfaces in the munition, which reduces shock vibrational pressures and stresses transferred to the fuze.

Embodiments are directed to a releasable erosion enhancing mechanism. A vented retaining ring is configured to fit concentrically around a fuze well. The retaining ring is centered about a central longitudinal axis and has an inner surface and an outer surface. A plurality of vents is axially spaced at equal distance about the venting ring's outer surface.

Embodiments are directed to a vented torque release device including hollow fuze well having a proximal end, a distal end, an inner surface, and an outer surface. A wall is defined by the inner surface and the outer surface. A plurality of vents are axially spaced at equal distance about the outer surface.

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Ridgecrest, CA, United States of America

Lee R Hardt