Mechanical behavior of a continuous filament carbon composite.
Mechanical properties of continuous carbon filament/graphite binder composite including tensile, compressure, flexure, fatigue and shear properties
COMPOSITE MATERIAL↗
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Results for “Composite materials”
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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Transverse normal loading of a unidirectional composite.
Transverse normal loading of doubly periodic unidirectional elastic fiber reinforced infinite elastic matrix
LOADING↗
Glass-, boron-, and graphite-filament-wound - Resin composites and liners for cryogenic pressure vessels.
Boron and graphite filament-resin composites tensile and interlaminar shear strengths and Al foil liner cyclic life in cryogenic pressure vessel tests
REINFORCING FIBER↗
The effect of interfiber distance and temperature on the critical aspect ratio in composites.
Interfiber distance and temperature effects on critical aspect ratio in fiber composites obtained from modified pull-out test
REINFORCING FIBER↗
Refractory metal fiber nickel alloy composites for use at high temperatures.
Stress-rupture properties of composites containing refractory metal fibers and nickel alloys evaluated at high temperatures
STRESS RUPTURE↗
Surveyor 6 lunar mission.
Surveyor 6 lunar landing mission data on lunar topography, chemical composition, magnetic material content, radar reflectivity, density, bearing capacity, etc
Jaffe, L. D.↗
A theoretical investigation of cracks in two-phase solids
Inhomogeneity in composite plastic materials resulting in cracks
Chou, T.-W.↗
Principal science results from Surveyor 5.
Surveyor 5 Mare Tranquillitatis landing site similarity to Oceanus Procellarum sites, discussing surface material elemental composition and lunar structure
Batterson, S. A.↗
Simplified procedure for emission spectrochemical analysis
Procedure involves dissolution of samples to prepare them for analysis, and uses single set of experimental conditions to analyze wide variety of materials and compositions without compromising analysis accuracy. Automated spectrometer alloys per sample analysis time of four minutes after sample dissolution.
Gordon, W. A.↗
Flight service evaluation of PRD-49/epoxy composite panels in wide-bodied commercial transport aircraft
Fairing panels were fabricated to evaluate the fabrication characteristics and flight service performance of PRD-49 (Kevlar-49) a composite reinforcing material and to compare it with the fiberglass which is currently in use. Panel configurations were selected to evaluate the PRD-49 with two resin matrix materials in sandwich and solid laminate construction. Left and right hand versions of these configurations were installed on L-1011's which will accumulate approximately 3000 flight hours per year per aircraft. The direct substitution of PRD-49 for fiberglass produced a twenty-six percent weight reduction on the panel configurations. Examination of these panels revealed that there was no visible difference between the PRD-49 and adjacent fiberglass panels.
Wooley, J. H.↗
Lightweight long life heat exchanger
The design, fabrication, and evaluation of a full scale shuttle-type condensing heat exchanger constructed of aluminum and utilizing aluminum clad titanium parting sheets is described. A long term salt spray test of candidate parting sheet specimens is described. The results of an investigation into an alternate method of making composite sheet material are discussed.
Moore, E. K.↗
Improving aircraft energy efficiency
Investigations conducted by a NASA task force concerning the development of aeronautical fuel-conservation technology are considered. The task force estimated the fuel savings potential, prospects for implementation in the civil air-transport fleet, and the impact of the technology on air-transport fuel use. Propulsion advances are related to existing engines in the fleet, to new production of current engine types, and to new engine designs. Studies aimed at the evolutionary improvement of aerodynamic design and a laminar flow control program are discussed and possibilities concerning the use of composite structural materials are examined.
Povinelli, F. P.↗
Development and fabrication of an advanced liquid cooling garment
The elastomeric film fin/tube concept which was developed is a composite of polyurethane film, fine expanded silver mesh, a serpentine pattern polyurethane transport tubing and an integral comfort liner, all bonded via adhesive application and vacuum-bagged for final cure. As demonstrated by thermal analysis, the composite garment material is capable of removing a 293 watt (1000 BTU/hr) metabolic load through a head and torso cooling area of .46 sq m (5 sq ft) with tube spacing of slightly under one inch. A total of 60 test elements, each .15m x .15m (6 in. x 6 in.) were fabricated in support of the liquid cooling garment concept development. In parallel with the fabrication of these elements a continuing series of laboratory tests to support the fabrication techniques was carried out. The elements and supporting tests are described.
Leith, J. R.↗
Development of sputtered techniques for thrust chambers
Procedures for closing out coolant passages in regeneratively cooled thrust chambers by triode sputtering, using post and hollow Cu-0.15 percent Zr cathodes are described. The effects of aluminum composite filler materials, substrate preparation, sputter cleaning, substrate bias current density and system geometry on closeout layer bond strength and structure are evaluated. High strength closeout layers were sputtered over aluminum fillers. The tensile strength and microstructure of continuously sputtered Cu-0.15 percent Zr deposits were determined. These continuous sputtered deposits were as thick as 0.75 cm. Tensile strengths were consistently twice as great as the strength of the material in wrought form.
Mullaly, J. R.↗
Improved epoxy adhesive with radiographic tracer
Addition of tungsten powder (4 percent by weight) to commercially available low viscosity epoxy adhesive, yields nonmetal composite repair material with enhanced radiographic contrast for radiographic and ultrasonic inspection techniques.
Campbell, R. G.↗
A space necklace about the earth
A space elevator is forecasted for the first quarter of the 21st century, that will consist of a cable attached at the earth's equator, suspended in space by an artificial satellite in geosynchronous orbit. It is stated that such a transport system will supplement rockets as the railway supplements aircraft. Specific aspects of the system are examined, including provisions for artificial gravity, the development special composite construction materials exhibiting high strength and low mass, and spacecraft launching from the elevator.
Polyakov, G.↗
Analysis/design of strip reinforced random composites (strip hybrids)
Advanced analysis methods and composite mechanics were applied to a strip-reinforced random composite square panel with fixed ends to illustrate the use of these methods for the a priori assessment of the composite panel when subjected to complex loading conditions. The panel was assumed to be of E-glass random composite. The strips were assumed to be of three advanced unidirectional composites to cover a range of low, intermediate, and high modulus stiffness. The panels were assumed to be subjected to complex loadings to assess their adequacy as load-carrying members in auto body, aircraft engine nacelle and windmill blade applications. The results show that strip hybrid panels can be several times more structurally efficient than the random composite base materials. Some of the results are presented in graphical form and procedures are described for use of these graphs as guides for preliminary design of strip hybrids.
Chamis, C. C.↗
Vacuum-bonded covering withstands low temperatures
Aluminum foil, tetrafluoroethylene (TEF), and glass fabric are vacuumbonded together to make composite covering material that is flexible, easy to handle, and unaffected by cryogenic temperatures.
Lerma, G.↗