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Piston temperature of lubricating oil testing diesel engines. (in English)
SYSTEMATIC
ABSTRACTS
OF
CURRENT
LITERATURE
(Translation of Zavodsk. Lab., 33 (6) (June 1967) 749-750 by Instrument Society of America, Pittsburgh.) It is proposed to determine the intensity of impact loading causing abrasive wear of machine parts by introducing the coefficient of impact. It is the ratio of the hardness of the G13L steel subjected to impact wear to the hardness of the same steel in its original condition. Using this coefficient, it is possible to establish the relationship between the laboratory tests and the actual service conditions. 6. ANALYSIS
AND
TESTING
Studies of the Mass Transfer between Copper-Graphite Brushes and a Copper Rotor by Using 1lomAg Part I (in German) K. Wagner, F. Brutschin and K. Kiipernick, Isotopenpvaxis, 2 (1966) 252-258; g figs., 4 tables, 4 refs. Mass transfer in the wear process of coppergraphite brushes labelled with a radioactive isotope on copper rotors has been investigated. It is shown how to use the long-lived 1lomAg as an indicator instead of the short-lived @Cu. Application of Radioisotopes in Wear and Lubrication Studies. (in German) K. Wagner, Isotopenpraxis, 4 (1968) 85-94; 4 figs., I table, 341 refs. Introduction. Methods and field of applicatracer tion (experimental arrangements, techniques, methods of measuring and evaluation, fields of application) Conclusion. References. Some Basic Studies with Radioactive Tracers in the SlidingWear of Metals. (in German) K. Wagner, R. Miiller and H. Gaedike, Technik, 22 (1967) 237-242; 6 figs., 4 tables, g refs. In a wear test apparatus radioactive-labelled metal pins were pressed against a rotating disk. The track of the pin was a volute, the material of the pin copper (6%~) or silver (IlomAg), the disks consisted of copper, steel, aluminium, and PVC, resp. The experiments were evaluated by determination of the adhering and loose parts of the material transferred from the pin to the disk. Wear of copper pins on copper and steel was one to
305
two orders of magnitude greater than on aluminium or PVC. Radioautographs showed decreasing homogeneity of the transferred material on the track in the following order: steel, copper, PVC, aluminium. Radioactivity used in Investigating the Sliding Wear of Steel. (in German) K. Wagner and R. Drassdo, H. Jost, Maschinenbautech., Suppl. “Lub. Tech.“, 17 (1968) 97-102; II figs., 4 tables, IO refs. A radioactive steel pin (59Fe,s1Cr) was pressed against the internal surface of a steel ring by centrifugal force. The wear of the pin, the fraction of worn material transferred to the ring and the fraction adhering to the ring were estimated. The main parameters influencing wear were the carbon content of the pin and the hardness of the ring. Piston Temperature of Lubricating Oil Testing Diesel Engines. (in English) M. Yoshida, T. Suwama and Y. Iguchi, Quart. Rep. Railway Tech. Res. Inst., 8 (2) (June 1967) 71-74. For abstract see Appl. Mech. Rev., 21 (1968) 546. Problems in Testing Motor Vehicle Tyres. H. P. Zoeppritz, MateriaZ+rtij., IO (4) (1968) 122-125; 2 tables, 3 refs. In view of the variety of tasks of a tyre as the connecting link between vehicle and road and as a design feature of the motor vehicle, it is not possible to judge the behaviour and performance of a tyre by means of a few test methods. The numerous and often opposing characteristics expected in a tyre require specific test methods for almost every single characteristic and every single condition under which it will be used. For a comprehensive assessment of the performance of the tyre it is not only necessary to carry out indoor testing of single tyres on the test wheel, tests on the road with tyres mounted on the vehicle, endurance tests on the road and on the test wheel, laboratory tests with stationary as well as running tyres, but also to evaluate and coordinate the test results on the basis of broad experience to be able to form a reliable opinion on the performance that can be expected of a specific tyre under all conditions of actual use on the vehicle.
Wear, 12 (1968) 299-305
ABSTRACTS
OF
CURRENT
LITERATURE
(Translation of Zavodsk. Lab., 33 (6) (June 1967) 749-750 by Instrument Society of America, Pittsburgh.) It is proposed to determine the intensity of impact loading causing abrasive wear of machine parts by introducing the coefficient of impact. It is the ratio of the hardness of the G13L steel subjected to impact wear to the hardness of the same steel in its original condition. Using this coefficient, it is possible to establish the relationship between the laboratory tests and the actual service conditions. 6. ANALYSIS
AND
TESTING
Studies of the Mass Transfer between Copper-Graphite Brushes and a Copper Rotor by Using 1lomAg Part I (in German) K. Wagner, F. Brutschin and K. Kiipernick, Isotopenpvaxis, 2 (1966) 252-258; g figs., 4 tables, 4 refs. Mass transfer in the wear process of coppergraphite brushes labelled with a radioactive isotope on copper rotors has been investigated. It is shown how to use the long-lived 1lomAg as an indicator instead of the short-lived @Cu. Application of Radioisotopes in Wear and Lubrication Studies. (in German) K. Wagner, Isotopenpraxis, 4 (1968) 85-94; 4 figs., I table, 341 refs. Introduction. Methods and field of applicatracer tion (experimental arrangements, techniques, methods of measuring and evaluation, fields of application) Conclusion. References. Some Basic Studies with Radioactive Tracers in the SlidingWear of Metals. (in German) K. Wagner, R. Miiller and H. Gaedike, Technik, 22 (1967) 237-242; 6 figs., 4 tables, g refs. In a wear test apparatus radioactive-labelled metal pins were pressed against a rotating disk. The track of the pin was a volute, the material of the pin copper (6%~) or silver (IlomAg), the disks consisted of copper, steel, aluminium, and PVC, resp. The experiments were evaluated by determination of the adhering and loose parts of the material transferred from the pin to the disk. Wear of copper pins on copper and steel was one to
305
two orders of magnitude greater than on aluminium or PVC. Radioautographs showed decreasing homogeneity of the transferred material on the track in the following order: steel, copper, PVC, aluminium. Radioactivity used in Investigating the Sliding Wear of Steel. (in German) K. Wagner and R. Drassdo, H. Jost, Maschinenbautech., Suppl. “Lub. Tech.“, 17 (1968) 97-102; II figs., 4 tables, IO refs. A radioactive steel pin (59Fe,s1Cr) was pressed against the internal surface of a steel ring by centrifugal force. The wear of the pin, the fraction of worn material transferred to the ring and the fraction adhering to the ring were estimated. The main parameters influencing wear were the carbon content of the pin and the hardness of the ring. Piston Temperature of Lubricating Oil Testing Diesel Engines. (in English) M. Yoshida, T. Suwama and Y. Iguchi, Quart. Rep. Railway Tech. Res. Inst., 8 (2) (June 1967) 71-74. For abstract see Appl. Mech. Rev., 21 (1968) 546. Problems in Testing Motor Vehicle Tyres. H. P. Zoeppritz, MateriaZ+rtij., IO (4) (1968) 122-125; 2 tables, 3 refs. In view of the variety of tasks of a tyre as the connecting link between vehicle and road and as a design feature of the motor vehicle, it is not possible to judge the behaviour and performance of a tyre by means of a few test methods. The numerous and often opposing characteristics expected in a tyre require specific test methods for almost every single characteristic and every single condition under which it will be used. For a comprehensive assessment of the performance of the tyre it is not only necessary to carry out indoor testing of single tyres on the test wheel, tests on the road with tyres mounted on the vehicle, endurance tests on the road and on the test wheel, laboratory tests with stationary as well as running tyres, but also to evaluate and coordinate the test results on the basis of broad experience to be able to form a reliable opinion on the performance that can be expected of a specific tyre under all conditions of actual use on the vehicle.
Wear, 12 (1968) 299-305