Research and development on cryogenic stretch-formed helium bottles Saturn 4-B Final report
Cryogenic stretch formed pressure vessels for Saturn 4B helium storage
Alper, R.↗
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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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Flaw Growth of 6Al-4V Titanium in a Freon TF Environment
The plane strain threshold stress intensity and sustained stress flaw growth rates were experimentally determined for 6AI-4V S.T.A. titanium forging and weldments in environments of Freon TF at room temperature. Sustained load tests of surface flawed specimens were conducted with the experimental approach based on linear elastic fracture mechanics. It was concluded that sustained stress flaw growth rates, in conjunction with threshold stress intensities, can be used in assessing the service life of pressure vessels.
Tiffany, C. F.↗
Cryogenic stretch form bottle test program Final report
Weld tests of stainless steel pressure vessels fabricated with cryogenic forming techniques
Alchorn, T. R.↗
Monitoring of crack growth in Ti-Al-4v alloy by the stress wave analysis technique
Stress wave analysis techniques for monitoring crack growth in Ti-6Al-4V alloy pressure vessel walls
Crimmins, P. P.↗
New structural approach for determining load carrying capability of filament wound composite materials
Metal lined boron and graphite composites exhibit high strength and minimum weight, making them superior to aluminum cylindrical shell structures and to steel or aluminum constructed pressure vessels. S glass filament-epoxy resin matrix with aluminum liner is suitable for cryogenic tanks.
Armstrong, W. H.↗
Hermetically sealed motion transmitter
Transmitter allows transmission of rotational or single planar arc motion through hermetically sealed chamber without use of dynamic seals or complex mechanisms. Device may interest pressure vessel designers and those who need to isolate equipment from a hostile environment.
Eckert, R. L.↗
Modular construction provides large volume storage facility in minimum space
Each modular element consists of two hemispherical shells with material removed near their apexes to permit joining by a weldment to form a passage. Elements are welded together at their largest dimensions to form either a straight line continuous or a circular pressure vessel.
Fahner, T.↗
Gas regulator Patent
Control of gas flow from pressurized vessel by thermal expansion of metal plug
Kami, S.↗
Controlled glass bead peening Patent
Method and apparatus for inducing compressive stresses in pressure vessel to prevent stress corrosion
Bales, T. T.↗
Development of calorimeter for spacecraft batteries Final report, 21 Jun. 1970 - 1 Feb. 1971
Development of calorimeter for spacecraft batteries comprising pressurized vessel, heat sink, and copper conductor
Johnston, W. V.↗
Composite overwrapped metallic tanks
Tension, biaxial, and creep tests of 5Al-2.5Sn titanium alloy and computerized design for fiberglass-epoxy overwrapped titanium pressure vessel
Feldman, A.↗
Cycle testing of boron filament wound tanks
Filament tensile strengths and pressure-strain characteristics of high modulus, high-strength, boron-filament-wound/resin-composite pressure vessel at ambient and cryogenic temperatures
Alfring, R. J.↗
Graphite fiber composites at cryogenic temperatures
Graphite fiber resin composites physical and mechanical properties at ambient and cryogenic temperatures, discussing unidirectional ring and bar specimens and filament wound pressure vessels
Simon, R. A.↗
Optimization of structures based on fracture mechanics and reliability criteria
Spacecraft structures weight optimization based on fracture mechanics and reliability cost constraints applied to pressure vessel design
Heer, E.↗
The external gamma radiation environment from the Kiwi Phoebus, and Pewee reactors
During the past few years, ground tests of high-powered propulsion-prototype reactors have provided several opportunities to observe the external radiation environment. Reactor tests have been conducted in free air and inside of open well shields. Measurements were taken over distances ranging from contact with the pressure vessel out to greater than 5000' both during operation and after shutdown. Some measurements characteristic of each of the systems are presented and compared with results of calculations.
Malenfant, R. E.↗
Radiation heating in selected NERVA engine components
The role of heating from nuclear radiation in design of the NERVA engine is treated. Some components are subjected to very high gamma heating rates in excess of 0.5 Btu/cubic inch/sec in steel in the primary nozzle or 0.25 Btu/cubic inch/sec in aluminum in the pressure vessel. These components must be cooled by a fraction of the liquid hydrogen propellant before it is passed through the core, heated, and expanded out the nozzle as a gas. Other components that are subjected to lower heating rates such as the thrust structure and the disk shield are designed so that they would not require liquid hydrogen cooling. Typical gamma and neutron heating rates, resulting temperatures, and their design consequences are discussed. Calculational techniques used in the nuclear and thermal analyses of the NERVA engine are briefly treated.
Courtney, J. C.↗
Discrete ordinates-Monte Carlo coupling: A comparison of techniques in NERVA radiation analysis
In the radiation analysis of the NERVA nuclear rocket system, two-dimensional discrete ordinates calculations are sufficient to provide detail in the pressure vessel and reactor assembly. Other parts of the system, however, require three-dimensional Monte Carlo analyses. To use these two methods in a single analysis, a means of coupling was developed whereby the results of a discrete ordinates calculation can be used to produce source data for a Monte Carlo calculation. Several techniques for producing source detail were investigated. Results of calculations on the NERVA system are compared and limitations and advantages of the coupling techniques discussed.
Lindstrom, D. G.↗