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Review of tribological sinks in six major industries

Description: Friction and material wear occur throughout all industries and are involved in many processes within each industry. These conditions make assessing tribological activity overall in industry very complex and expensive. Therefore, a research strategy to obtain preliminary information on only the most significant industrial tribological sinks was defined. The industries examined were selected according to both the magnitude of overall energy consumption (particularly machine drive) and the known p… more
Date: September 1, 1985
Creator: Imhoff, C. H.; Brown, D. R.; Hane, G. J.; Hutchinson, R. A.; Erickson, R.; Merriman, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Assessment of government tribology programs

Description: An assessment has been made to determine current tribology research and development work sponsored or conducted by the government. Data base surveys and discussions were conducted to isolate current projects sponsored primarily by 21 different government organizations. These projects were classified by subject, objective, energy relevance, type of research, phenomenon being investigated, variables being studied, type of motion, materials and application. An abstract of each project was prepared… more
Date: September 1, 1985
Creator: Peterson, M.B. & Levinson, T.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low Temperature Thermoluminescence of Gamma Irradiated Potassium Dihydrogen Phosphate

Description: Thermoluminescence in potassium dihydrogen phosphate (KDP) induced by Co/ sup 60/ gamma irradiation at liquid nitrogen temperature (-198 deg C) was investigated. Glow curves in the temperature range --196 to 0 deg C were measured for a series of gamma exposure dosages ranging from 10/sup 4/ roentgen to 5 x 10/sup 6/ roentgen. The heating rate used for glow curve measurements was 12 deg C per minute. Twice recrystallized Mallinckrodt reagent grade potassium dihydrogen phosphate, with a grain siz… more
Date: October 19, 1962
Creator: Sims, T. M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Theoretical and experimental studies of churn flow in vertical tubes. Final technical report

Description: The pattern known as churn flow is a highly unsteady pattern with stochastic features and is extremely complex. However, calculations show that for many geothermal wells the condition of churn flow consists over much of the length of the two phase zone. Furthermore, it frequently exists at the surface so that design of separation equipment and surface piping depends on the accurate modelling of this type of flow. It has been the long term purpose of this project to develop physically based mode… more
Date: January 27, 1986
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Scale effects in sliding friction: An experimental study

Description: Solid friction is considered by some to be a fundamental property of two contacting materials, while others consider it to be a property of the larger tribosystem in which the materials are contained. A set of sliding friction experiments were designed to investigate the hypothesis that the unlubricated sliding friction between two materials is indeed a tribosystems-related property and that the relative influence of the materials properties or those of the machine on friction varies from one s… more
Date: July 24, 1991
Creator: Blau, P.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nucleon exchange in damped nuclear reactions

Description: Starting from the general context of one-body nuclear dynamics, the nucleon-exchange mechanism in damped nuclear reactions is discussed. Some of its characteristic effects on various dinuclear observables are highlighted and a few recent advances are described.
Date: April 1, 1986
Creator: Randrup, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impact of advanced fluids on costs of district cooling systems

Description: Three alternate fluids, ice-water slurry, friction reduction additive and the combination of them, have been compared for use in District Cooling Systems (DCS). The effect of the fluids on cost and cooling capacities were considered for the two cases of new and existing DCS separately. Two criteria were used in comparisons among fluids in each case: constant pumping power which allows for the most benefit, and constant velocity which is more practical consideration. An economic assessment for a… more
Date: January 1, 1992
Creator: Choi, U.S. (Argonne National Lab., IL (United States)); France, D.M. & Knodel, B.D. (Argonne National Lab., IL (United States) Illinois Univ., Chicago, IL (United States). Dept. of Mechanical Engineering)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of anelastic relaxations controlled by a spectrum of relaxation times

Description: Anelastic studies, although they have provided an important method for investigating the mobility of point defects in solids, have often been difficult to analyze when a continuous spectra of relaxation times controls the anelastic response. This paper describes a new method for obtaining accurate estimates of relaxation time spectra by direct analysis (without prior assumptions) of the data using a nonlinear regression method. Applications to internal friction and anelastic creep results are d… more
Date: January 1, 1983
Creator: Cost, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Wear and corrosion performance of metallurgical coatings in sodium

Description: The friction, wear, and corrosion performance of several metallurgical coatings in 200 to 650/sup 0/C sodium are reviewed. Emphasis is placed on those coatings which have successfully passed the qualification tests necessary for acceptance in breeder reactor environments. Tests include friction, wear, corrosion, thermal cycling, self-welding, and irradiation exposure under as-prototypic-as-possible service conditions. Materials tested were coatings of various refractory metal carbides in metall… more
Date: April 24, 1980
Creator: Johnson, R. N. & Farwick, D. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Deconvolution analysis to determine relaxation time spectra of internal friction peaks

Description: A new method for analysis of an internal friction vs temperature peak to obtain an approximation of the spectrum of relaxation time responsible for the peak is described. This method, referred to as direct spectrum analysis (DSA), is shown to provide an accurate estimate of the distribution of relaxation times. The method is validated for various spectra, and it is shown that: (1) It provides approximations to known input spectra which replicate the position, amplitude, width and shape with goo… more
Date: January 1, 1985
Creator: Cost, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental evaluation of a contact area evolution model

Description: Experiments designed to simulate boundary lubrication conditions during sheet forming were performed and evaluated. The results are compared to a model for contact area evolution caused by flattening of surface asperities. Microscopic observations and estimates of the area fraction in boundary contact agree reasonably well with the model. The effect of microstructural features on the accuracy of continuum models is also discussed. 8 refs., 15 figs.
Date: January 1, 1991
Creator: Korzekwa, D.A. (Los Alamos National Lab., NM (United States)) & Dawson, P.R. (Cornell Univ., Ithaca, NY (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Assessment of industrial attitudes toward generic research needs in tribology

Description: Based on extended discussions during visits with 27 companies representing 13 different parts of the tribology industry (such as bearings, lubricants, coatings, powerplants), it is apparent that only a tiny fraction of the large sums publicly reported as R and D expenditures by industry are used to fund generic tribology research. For example, of the greater than $2 B expenditures reported for R and D in the lubricants sector for 1982, the estimated total for generic tribology research was $12 … more
Date: September 1, 1985
Creator: Sibley, L.B.; Zlotnick, M. & Levinson, T.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cover-gas-seal component development: dynamic inflatable-plug seal improvement

Description: This report documents the 1) radial compliance and 2) low friction coating tests conducted on the CRBRP Rotating Plug Inflatable Seals per test plan N707TR810014. Test results show that narrowing the seal blade from 0.25 to 0.12 in. will effectively reduce dynamic drag from 30 to 20 lb/ft under nominal conditions and will increase seal radial compliance from 0.12 to 0.30 in. without an unacceptable rise in dynamic drag. Tests also demonstrated that application of a teflon coating to the seal we… more
Date: September 15, 1977
Creator: Horton, P.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determination of coefficients for the universal laws of friction and heat transfer for CFTL calculations

Description: The friction factor and Stanton number for flow past a roughened surface are determined by the parameters A and R(h/sup +/) of the universal law of friction and A/sub H/ and G(h/sup +/) of the universal law of heat transfer. The methods to be used for determination of these parameters for the particular roughness to be used in the Core Flow Test Loop (CFTL) are presented. Examples are given concerning the application of these methods to both transitional and fully rough flow using experimental … more
Date: August 1, 1980
Creator: Hodge, S.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Scale-up of circulating fluidized bed coal combustors

Description: This experimental project has been aimed at quantifying the effects of scale-up upon the hydrodynamics of CFB coal combustors. To this end, we have constructed a cold CFB facility with the ability to recirculate, -- rather than discard, -- fluidization gas mixtures of adjustable density and viscosity. Hydrodynamic analogy between the cold bed and a coal combustor is achieved by matching all relevant dimensionless parameters (Glicksman, 1984; Louge, 1987). Several choices of gas composition and … more
Date: January 1, 1991
Creator: Louge, M.Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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BEARING MATERIALS COMPATIBILITY FOR SPACE NUCLEAR AUXILIARY POWER SYSTEMS

Description: A program to evaluate materials for suitability ss exposed bearings on nuclear auxiliary power systems (SNAP Program) for space vehicles is reported. Friction coef ficients of material combinations in a 10/sup -6/ mm Hg vacuum at 1000 deg F for 200 hr were measured. Seven combinations found to have friction coefficients less than 0.50 are: graphite-Haynes 90; graphite-Stellite No. 3; graphiteAl/sub 2/O/sub 3/ (sprayed); Al/sub 2/O/sub 3/ (sprayed)-Cr/sub 3/ C/sub 2/ (spr ayed); Al/sub 2/O/sub 3… more
Date: September 1, 1961
Creator: Kurzeka, W.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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TWO-PHASE PRESSURE DROP IN A NATURAL CIRCULATION BOILING CHANNEL

Description: Experimental two-phase pressure drop data were obtained from a 1/4 x 2 x 60-in. vertical, uniformly heated, test section. The local volume fraction of steam was measured simultaneously with the pressure drop, thus allowing separation of the terms for hydrostatic and acceleration pressure drops from the over-all static pressure drop. The results are expressed in terms of an averge two-phase friction factor multiplier, R = DELTA P/sub TPF// DELTA P/sub L/O/sub ,/ and are co mpared with the Martin… more
Date: August 1, 1961
Creator: Hoglund, B.M.; Weatherhead, R.J. & Epperson, T.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of anelastic evidence for interstitial solute binding in bcc metals

Description: A Direct Spectrum Analysis (DSA) technique has been applied to key internal friction and elastic after-effect data which are involved in the controversy over the existance of interstitial clustering in the refractory metals. It is found that at relatively high interstitial solute concentrations some of the Snoek peak broadening is due to relaxations that are distinct from the main relaxation. This finding supports the view that interstitial solutes have an interaction that produces clusters of … more
Date: 1985
Creator: Cost, J. R. & Stanley, J. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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TATB PBX drilling. Period covered: July--September 1977

Description: The temperatures produced on drilling (without water) small holes in pressed TATB PBX samples were measured using thermocouples in /sup 3///sub 16/-in. and /sup 1///sub 4/-in. twist drills. Temperatures up to 273/sup 0/C were obtained at 480 rpm and a feed rate of 0.001 in/rev for PBX 9502. Lower temperatures were measured at lower speeds and for RX-03-BB. A feed rate of 0.007 in/rev and speed of 160 rpm gave temperatures below 165/sup 0/C in all cases.
Date: January 1, 1977
Creator: Washburn, B.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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