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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Heavy-gage bonded honeycomb sandwich is used as a primary load-bearing structural material in large-diameter boosters. Theoretical investigations based on a small deflection theory for prediction of stress fields and buckling loads, and structural testing were made. This structure is a potential weight saver for compression load-critical components.
Temperature controlled strain-gaged extensometer measures longitudinal and girth deflections of pressure vessels in excess of one percent strain during pressurization and depressurization with cryogenic fluids at cryogenic temperatures. The device is of beryllium-copper strips.
Simulated service life of strain gage pressure transducers
Radio frequency mass gaging techniques for measuring propellant mass content in Apollo and lunar module tanks
Striking characteristics of magnetron ionization gages in helium over low pressure range
Optimal configuration for zero-g nucleonic fuel gage
Single-component scratch-gage transducer incorporates a unique motion magnification scheme to increase the magnitude of the load measuring scratch approximately 15 times over that of conventional models. It is small, load carrying and high in natural frequency.
Calibration system consists of a gas source, a source pressure gage, source volume, transfer volume and test chamber, plus appropriate piping, valves and vacuum source. It has been modified to cover as broad a range as possible while still providing accuracy and convenience.
Inorganic bonding for semiconductor strain gages for use in space and ultrahigh vacuum
Test results on suitability of 15 alloys for use in strain gages at temperatures up to 1200 deg F
Hysteresis of strain gage absolute pressure transducer
Volume-ratio system for vacuum gage calibration from 10 to minus 8 to 10 torr
Strain gages to measure flight loads in high temperature environment, discussing selection, calibration techniques and performance characteristics
Device welds fine gage wire 0.001-in. in diameter. It permits welding of thermocouple junctions of the same size with straight sections adjacent to the junctions. Electrode arrangement provides constant pressure on the joint during welding while fully supporting the wires to prevent buckling or movement.
Instrumenting tape members of textile parachutes to determine load capability is accomplished by mounting strain-gage instrumented metal plates to the tape by stiff rubber pads. The pads permit gradual transfer of the load from the tape to the plates without stress concentrations in the tape.
Ionization gage with improved signal-to-noise ratio has a helical coil electrode which separates the solid cathode ion collector from the volume where ionization of gas molecules takes place. Helical coil increases lifetime of electrons and reduces secondary emission from the collector.
Quadrupole system, energized with a 200 MHz electric field, restrains ionizing electrons within the center of the ionization gage. Oscillatory trajectory of the electrons increases the probability of ionizing the gas molecules, lowers background X-ray level, and increases the signal-to-noise ratio.
Mathematical models for cold cathode magnetron ultrahigh vacuum gage