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Crews, Jeanne L.

Publications and source records attributed to Crews, Jeanne L..

6 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2005

Flexible Multi-Shock Shield

Flexible multi-shock shield system and method are disclosed for defending against hypervelocity particles. The flexible multi-shock shield system and method may include a number of flexible bumpers or shield layers spaced apart by one or more resilient support layers, all of which may be encapsulated in a protective cover. Fasteners associated with the protective cover allow the flexible multi-shock shield to be secured to the surface of a structure to be protected.

Christiansen, Eric L.↗
NASA NTRS1997

Enhanced Whipple Shield

A hypervelocity impact (HVI) Whipple Shield and a method for shielding a wall from penetration by high velocity particle impacts where the Whipple Shield is comprised of spaced apart inner and outer metal sheets or walls with an intermediate cloth barrier arrangement comprised of ceramic cloth and high strength cloth which are interrelated by ballistic formulae.

Crews, Jeanne L.↗
NASA NTRS1992

Multishock Shield Against Meteoroids And Debris

Two documents discuss "multi-shock shielding" concept, according to which multiple spaced, very thin layers of material protects spacecraft against impacts by meteoroids, orbiting debris, or other projectiles traveling at hypervelocities. According to concept, incoming projectile broken up upon impact on first (outermost) layer, and fragments further broken up by subsequent layers. At each successive surface, impact pressure heats fragments, eventually melting and/or vaporizing them.

Cour-Palais, Burton G.↗
NASA NTRS1992

The NASA JSC Hypervelocity Impact Test Facility (HIT-F)

The NASA Johnson Space Center Hypervelocity Impact Test Facility was created in 1980 to study the hypervelocity impact characteristics of composite materials. The facility consists of the Hypervelocity Impact Laboratory (HIRL) and the Hypervelocity Analysis Laboratory (HAL). The HIRL supports three different-size light-gas gun ranges which provide the capability of launching particle sizes from 100 micron spheres to 12.7 mm cylinders. The HAL performs three functions: (1) the analysis of data collected from shots in the HIRL, (2) numerical and analytical modeling to predict impact response beyond test conditions, and (3) risk and damage assessments for spacecraft exposed to the meteoroid and orbital debris environments.

Crews, Jeanne L.↗
NASA NTRS1990

A multi-shock concept for spacecraft shielding

A spacecraft-shielding technique is investigated in which the geometrical configuration and material used are emphasized. Ultrathin spaced shield elements are employed to repeatedly shock the impacting projectile to a high energy state that causes melting and vaporization. The ratio of the thickness of the elements to projectile diameter corresponds to a relatively small percentage of debris-plume mass that can be withstood by the backsheet. The strength of the backsheet is thereby reduced and employed in a specific configuration that prevents the debris plume from destroying successive sheets before the particulates reach the sheet. The primary benefit is weight reduction of 30 percent when compared to a 'Whipple shield' fabricated with the same material. The concept is shown to be effective against all impact types tested and produces minimal secondary debris.

Cour-Palais, Burton G.↗