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Jex, D. W.

Publications and source records attributed to Jex, D. W..

10 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1976

The effects of solid rocket motor effluents on selected surfaces and solid particle size, distribution, and composition for simulated shuttle booster separation motors

A series of three tests was conducted using solid rocket propellants to determine the effects a solid rocket plume would have on thermal protective surfaces (TPS). The surfaces tested were those which are baselined for the shuttle vehicle. The propellants used were to simulate the separation solid rocket motors (SSRM) that separate the solid rocket boosters (SRB) from the shuttle launch vehicle. Data cover: (1) the optical effects of the plume environment on spacecraft related surfaces, and (2) the solid particle size, distribution, and composition at TPS sample locations.

Jex, D. W.↗
NASA NTRS1975

Feasibility demonstration for hydrogen chloride detection using a chemisorption technique and a quartz crystal microbalance

A method of measuring concentrations of hydrogen chloride between 1 part per billion and 10 parts per million at standard temperature and pressure is presented. The feasibility of a low-cost device incorporating a chemisorption technique coupled with a quartz crystal microbalance was demonstrated in the field at the Viking B launch using a Titan-Centaur vehicle from Kennedy Space Center on August 20, 1975. Hydrogen chloride is a product of solid rocket combustion. The concentration level of hydrogen chloride for this particular launch was measured as approximately 0.2 parts per million at 4 km from the launch site.

Jex, D. W.↗
NASA NTRS1975

New two-stage accelerator for hypervelocity impact simulation

The present knowledge of the micrometeoroid environment and the simulation requirements for laboratory devices show that the simulated mass-velocity range must be extended to higher values in both mass and velocity. This is accomplished with the new two-stage accelerator, which consists of a light gas gun as the first stage and a coaxial accelerator with a compressor coil as the second stage. The operation of the new device is described together with a theoretical investigation of the timing of the first and the second stage, which leads to an appropriate adjustment of the two stages. The theoretical and experimental results agree well and show that 600-micron diameter glass beads have been accelerated to velocities near 20 km/sec.

Igenbergs, E. B.↗
NASA NTRS1973

Hypervelocity impact testing of L-band truss cable meteoroid shielding on Skylab

A series of tests was performed to determine the protection provided by the L-band truss cable meteoroid shielding installed on Skylab space station at space environment temperatures of minus 180 F. The damage sustained when three test specimens were impacted by spherical projectiles at hypersonic speed was investigated. It is concluded that the L-band truss cable meteoroid shielding provides adequate protection at the indicated temperature.

Jex, D. W.↗
NASA NTRS1973

Hypervelocity impact testing of cables

The physics and electrical results obtained from simulated micrometeoroid testing of certain Skylab cables are presented. The test procedure, electrical circuits, test equipment, and cable types utilized are also explained.

Jex, D. W.↗