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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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General mechanism of stress corrosion of aluminum alloys and ultrasonic detection techniques
Stress corrosion cracking of high strength aluminum alloys investigated by electrochemical, mechanical, and electron microscopic techniques
Stress corrosion of aluminum alloys and techniques for its detection
Mechanism of stress corrosion cracking in aluminum alloys and techniques for detection of surface defects
Optical and satellite techniques for monitoring atmospheric ozone
Fiber glass honeycomb sandwich storage tank for long term space flight
Ultrapure copper fluoride synthesis, analytical techniques, and production of one kilogram for cathode material
Design optimization and fabrication of conical support structure for cryogenic tank in long duration space flight
Feasibility of instrumental methods to detect stress corrosion cracking property of aluminum alloys
Techniques for growth of bulk single crystals by Czochralski method
Bibliography on emittance of high temperature materials including refractory materials, ceramics, carbon, graphites, chars, and ablative materials for use in aerospace engineering
Emittance measurement techniques for space shuttle materials in high temperature environmental simulation
Techniques and apparatus design for measuring high temperature emissivity of thermal protection materials for reentry vehicles
The progress during the sixth quarterly period is reported on construction and assembly of a test facility to determine the high temperature emittance properties of candidate thermal protection system materials for the space shuttle. This facility will provide simulation of such reentry environment parameters as temperature, pressure, and gas flow rate to permit studies of the effects of these parameters on the emittance stability of the materials. Also reported are the completed results for emittance tests on a set of eight Rene 41 samples and one anodized titanium alloy sample which were tested at temperatures up to 1600 F in vacuum. The data includes calorimetric determinations of total hemispherical emittance, radiometric determinations of total and spectral normal emittance, and pre- and post-test room temperature reflectance measurements.
A prototype compact reactor suitable for combustion of propane with oxygen under shallow as well as submerged deep submergence diving conditions is reported. The device is used to heat the circulating water in a water tube-type diving suit.
There are no author-identified significant results in this report.
The calibrating and testing procedures for the radiometric emittance measurement apparatus are described. Test results are given for the NBS platinum-rhodium standard (SRM No. 1409), the NBS oxidized Kanthal standard, and the oxidized Rene 41 materials. Results indicate that with the platinum-rhodium standard the measurement system compared with the NBS data to within 0.02 for both total and spectral normal emitttance. Data from the Kanthal strip was consistently higher than NBS values. For oxidized Rene 41, no significant changes in as prepared emittance was observed. The emittance was stable for temperatures up to 1150 K.
Attenuated total reflectance spectra of individual contaminants in space simulation chambers are presented as well as spectra of mixtures and figures exhibiting the effects of film thickness on reflectance spectra. Detailed calibration spectra were made for three selected concentrations (film thickness) for two contaminants and for one concentration for all contaminants.