8/12/2019 Wear Volume 6 Issue 1 1963 [Doi 10.1016%2F0043-1648%2863%2990065-6] -- Cavitation Tunnel Tests With Merc

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SYSTEMATIC ABSTRACTS 89solutions made possible the indirect measure-ment of point-wise juncture conditions atthe interface of sliding contacts; the actualmechanical mode is only described schemati-cally. The solutions are most suitable formatching the solutions at the interface,given by juncture condition.Greens Function of Radial Displacementin a Circular Disc Due to Unit Normal andTangential Loads.C. W. Ng (Wright-Patterson AFB, Ohio, Di-rectorate of Materials and Processes), Preprintcopy (IgO?.) rg pp., 5 refs.; Rensselaer Poly-technic Inst. Troy, N.Y.; N 62-16344, T.P.A.,2 16) 1962)921).Using the method of Muskhelishvili, theGreens function of radial displacement isobtained in a circular disc due to a unitnormal and a unit shear traction at theboundary. This Greens function is useful inthe study of contact problems in sliding aswell as in rolling, i.e. the important problemof elasto-hydrodynamics is included. Anexample is carried out for the distribution ofheat generation due to a rigid rider against anelastic slider which is in the form of a circulardisc.Measurement of Point-wise Juncture Con-d&ion of Temperature at the Interface ofTwo Bodies in Sliding Contact.F. F. Ling and T. E. Simkins, Tech. DOG.Rep.Rensselaer Polytechnic Inst., (rg6r-rg6z) 30pp., 3 refs.; N 62-16323, T.P.A., z (16)(1962) 929.An apparatus is described for bringing a riderspecimen and a slider specimen into continu-ous sliding contact so that significant tem-peratures at the interface are achievable. Thedesign is such that the flow fields of heat inthe specimens would be at most two-dimen-sional, i.e., within engineering approxima-tions; this fact makes possible the measure-ment of temperatures of the specimens with-out disrupting the flow fields of heat. Typicaldata are presented of speed, normal load,frictional resistance and temperatures atstrategic locations on the specimens. Usingthe heat-equation solutions obtained pre-viously for the configurations concerned,contact-surface temperature distributions ofbath the specimens are calculated from ex-perimental data. Results give the point-wise,temperature juncture condition at the inter-face.Mechanisms of Friction and Wear betweenSolid SurfacesK. E. Boyd, C. T. Rollins and A. D. Thomas(Utah University, Salt Lake City, Utah),(1962) 62 pp., 145 refs.; N 62-11084, T.P.i4.,2 (4) (1962) 53.A low-velocity friction testing machine for

surface velocities of from I.0 ft./see to 15.0ft./set and a high-velocity friction testingmachine for surface velocities of from 1.0ft./see to 200 ft./set are designed, fabricatedand used to test a number of pairs of solidmaterials. Coefficients of friction as a func-tion of several parameters were measuredand plotted. It was found that a uniqueinterface temperature between rubbing ma-terials does not exist, but rather a randomextremely variable temperature profile ofconsiderable magnitude does exist. Data wereobtained which give evidence for deducingthe effects of reactivity and solid solubilityon the friction process.Friction Measurement with the TaperedSpindle Top.J. W. Givens and S. K. Talley, LubricationEng., r8 (10) (1962) 443-449; 6 figs., 3 tables,5 refs.The Tapered Spindle Top, a new apparatusfor kinetic friction measurements, is descri-bed. This device is characterized by a linerather than a point contact between thebearing surfaces as in the Four-Ball appa-ratus. The new machine covers a load rangeintermediate between that of the Four-Balland journal bearing test machines and forthis reason is especially well suited for study-ing the transition between hvdrodvnamic_ .and boundary friction.A method has been developed for resolvingfriction in the transition reg,on of lubricationinto hydrodynamic and boundary compo-nents, thereby affording a means of meas-uring oiliness.At low speed the top is capable of meas-uring kinetic boundary friction and providesa sensitive and rapid method for determiningthe variation of coefficient of friction withvelocity, an important property of lubricantsin many practical applications.Study on a Radioactive Method foe Esti-mating the Lubricating Qualities of Com-pound Oils by Using the Wear of Surfaces.(in English)D. Paveiescu, I. Ifiuc and S. Barbul, Rev.Mecan. AP$., 6 (4) (1961) 539-547; A .MecR. Rw., r5 (8) (1962) 681.Eouinment for Measuring Vibrations inA&friction 3earings. -Z. landa, En h Abstracts o Selected Arti-cles .from Soviet Bloc and M~ainland ChinaTechnical Journals, Ser. 4. No. g (1961).U.S. Dept. Commerce, OTS, Washington 25,D.C.; A&s%. &feck. Iiezl., ~5 (8) (1962) 681.Cavitation Tunnel Tests with MerchantShip Propellers. (in English)I-I. Lindgren, Mead. Stat. Skeppsprov. Amt.G borg, No. 48 (1961) 43 pp., 11 rcfs.; l Ppl.Merh. Rev., rfj (9) (1962) 759.

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