The forge phase of friction welding. I, II
Forge phase rigid and plastic region model of friction welding, deriving interfacial dispersion parameter of weld quality optimization
Rich, T.↗
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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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Friction and wear of steels in air and vacuum
Friction and wear of steels, Ti, Al, Cu and copper beryllium in sliding over hardness range of steel plates in vacuum and air
Jellison, J.↗
Evaluation techniques for the friction behavior of gold sliding contacts operating in high- purity environments
Gold sliding electric contacts friction behavior, studying adsorbed gas lubrication in ultrahigh purity environments
Glaeser, W. A.↗
An evaluation of theories for predicting turbulent skin friction and heat transfer on flat plates at supersonic and hypersonic Mach numbers
Turbulent skin friction and heat transfer prediction on flat plates and wind tunnel walls at supersonic and hypersonic Mach numbers, using Van Driest theory
Hopkins, E. J.↗
An investigation of film-cooling effectiveness and skin friction in hypersonic turbulent flow
Flat plate surface film cooling by two dimensional tangent slot injection in hypersonic turbulent flow, measuring equilibrium temperatures and skin friction
Cary, A. M., Jr.↗
Lubrication, friction, and wear in aircraft
Aircraft parts lubrication friction and wear problems, discussing failure modes, solid and liquid lubricants, component damage and lubrication systems
Johnson, R. L.↗
A review of surface segregation, adhesion and friction studies performed on copper-aluminum, copper-tin and iron-aluminum alloys
Surface segregation, adhesion and friction of monocrystalline Cu-Al, Cu-Sn and Fe-Al alloys from Auger emission spectroscopy and low energy electron diffraction experiments
Buckley, D. H.↗
Low-friction ball-and-socket
Ball-bearing retainer assembly reduces friction in ball-and-socket mount which replaces gimbals mounting used with spacecraft antennas.
Imus, R. E.↗
Longitudinal friction forces in piping design
Scheme measures sliding support friction forces and incorporates them into software programs which are used to analyze piping flexibility.
Parker, C. S.↗
Joining precipitation-hardened nickel-base alloys by friction welding
Solid state deformation welding process, friction welding, has been developed for joining precipitation hardened nickel-base alloys and other gamma prime-strengthened materials which heretofore have been virtually unweldable. Method requires rotation of one of the parts to be welded, but where applicable, it is an ideal process for high volume production jobs.
Moore, T. J.↗
An exact closed form solution for constant area compressible flow with friction and heat transfer
The well-known differential equation for the one-dimensional flow of a compressible fluid with heat transfer and wall friction has no known solution in closed form for the general case. This report presents a closed form solution for the special case of constant heat flux per unit length and constant specific heat. The solution was obtained by choosing the square of a dimensionless flow parameter as one of the independent variables to describe the flow. From this exact solution, an approximate simplified form is derived that is applicable for predicting subsonic flow performance characteristics for many types of constant area passages in internal flow. The data included in this report are considered sufficiently accurate for use as a guide in analyzing and designing internal gas flow systems.
Sturas, J. I.↗
A force balance system for the measurement of skin friction drag force
Research on force balance instrumentation to measure the skin friction of hypersonic vehicles at extreme temperatures, high altitudes and in a vibration field is discussed. A rough overall summary and operating instructions for the equipment are presented.
Moore, J. W.↗
Dynamic friction and wear of a solid film lubricant during radiation exposure in a nuclear reactor
The effect of nuclear reactor radiation on the performance of a solid film lubricant was studied. The film consisted of molybdenum disulfide and graphite in a sodium silicate binder. Radiation levels of fast neutrons (E or = 1 MeV) were fluxed up to 3.5 times 10 to the 12th power n/sq cm-sec (intensity) and fluences up to 2 times 10 to the 18th power n/sq cm (total exposure). Coating wear lives were much shorter and friction coefficients higher in a high flux region of the reactor than in a low flux region. The amount of total exposure did not affect lubrication behavior as severely as the radiation intensity during sliding.
Jacobson, T. P.↗
Charts for predicting turbulent skin friction from the Van Driest method (2)
Charts are presented for rapidly estimating local or average turbulent skin friction on flat plates from Reynolds numbers, based on either length or momentum thickness. These charts facilitate the conversion from one Reynolds number to the other. Ranges of variables covered are: Mach number, 0 to 10; length Reynolds number, 10 to the 5th to 10 to the 9th power; and wall-to-adiabatic-wall temperature ratio, 0.2 to 1.0.
Hopkins, E. J.↗
Friction losses in a lubricated thrust-loaded cageless angular-contract bearing
The NASA spinning torque apparatus was modified to measure the spinning torque on a cageless ball thrust bearing. Friction torque was measured for thrust loads varying from 44.5 to 403 newtons (10 to 90 lb) at speeds of 1000, 2000, and 3000 rpm. Tests were conducted with di-2-ethylhexyl sebacate and a synthetic paraffinic oil. These tests were run with either oil jet lubrication or with a thin surface film of lubricant only. An analytical model which included rolling resistance was developed and extended from previous models for spinning torque and lubricant rheology. The model was extended by the inclusion of rolling resistance. The computed values were in fair agreement with the experimental results and confirmed previous hypotheses that a thin lubricant film gives minimum bearing torque and an oil jet flow of a viscous lubricant will result in considerable rolling torque in addition to the torque due to ball spin.
Townsend, D. P.↗
Ball motion and sliding friction in an arched outer race ball bearing
The motion of the ball and sliding friction in an arched outer race ball bearing under thrust loads is determined. Fatigue life evaluations were made. The analysis is applied to a 150 millimeter bore ball bearing. The results indicated that for high speed-light load applications the arched bearing has significant improvement in fatigue life over that of a conventional bearing. An arching of 0.254 mm (0.01 in.) was found to be an optimal. For an arched bearing it was also found that a considerable amount of spinning occurs at the outer race contacts.
Hamrock, B. J.↗
Progress on the development of skin friction sensors.
A skin friction measuring system is described which will operate to 2000 F for short periods of time and continuously to 1300 F. A prototype system has been constructed and is being placed in operation. Information on alternative feasible systems is presented. Emphasis is placed on presenting research results in the form of useful design information and experimental data.
Mcvey, E. S.↗
Ball motion and sliding friction in an arched outer-race ball bearing
The motion of the ball and sliding friction in an arched outer-race ball bearing under thrust load is analyzed. Fatigue life evaluations were made. The analysis is applied to a 150-millimeter-bore ball bearing. The results indicated that for high-speed light-load applications the arched bearing has significant improvement in fatigue life over that of a conventional bearing. An arching of 0.254 mm (0.01 in.) was found to be optimal. Also, for an arched bearing a considerable amount of spinning occurs at the outer-race contacts.
Hamrock, B. J.↗