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Wear of elastomers as a function of tensile strength at high velocities of deformation. (in German)
417
LITERATURE AND CURRENT EVENTS Staatlichen Materialprtifungsanstalt Technischen Hochschule Stuttgart.) See also Wear, g (1966) 282.
an der
Impact Wear Tests on Steel. (in German) H. Uetz and H. Breckel, MateriaZprii&ng. 8 (IO) (1966) 361-367; 16 figs., 14 refs. Impact wear tests have been performed with the materials C15 against C15 and C67H against C67H on a rotary impact wear testing machine with impact speeds of 3-12 m/set and impact angles of go” and 45”. The influences of speed, of the radius of the striking specimen, and of the mass of the struck specimen on impact force, impact duration, impact coefficient and wear for a number of impacts up to 20,000 have been determined. Wear of Elastomers as a Function of Tensile Strength at High Velocities of Deformation. (in German) R. Ecker, MateriaZ+i~j%ng, 8 (IO) (1966) 368-374; 6 figs., I table, 2g refs. (Transla-
tion available from author; Bayer AG, Leverkusen.) In an earlier communication the author defined wear, especially with tyres, as a thermal oxidative process caused by a mechanical tensile rupture at high deformation rates, in which the visco-elastic data play a decisive role. The present article deals with the results of experiments on 6 elastomers. The tensile strength was determined within a temperature range of zo-140°C at strain rates of ~o-zo,ooo~/~ per second. Since wear is a consequence of frictional processes, the coefficients of friction, dependent on temperature, were tested on dry, wet and iced asphalt fine-concrete tracks. From these test results an empirical relation is established between wear, friction, visco-elastic properties, tensile strength at high strain which makes it rate, and temperature, possible to predetermine the abrasion behaviour of a vulcanisate in laboratory tests.
Wear.
IO (1967) 410-417
New Books, Documentation Book
reviews
WerkstoffzerstGrung durch Kavitation. By H. H. Piltz, published by VDI-Verlag 382 refs., DIN A 5, DM 19.80.
GmbH,
Dusseldorf,
1966; g2 pp., 42 figs.,
17 tables,
Dr. Piltz has written a thesis on cavitation under the guidance of Professor H. Wiegand (Darmstadt, 1963). This systematic literature review is an additional result of his studies. The whole field is subdivided into the following sections : Concepts; history; testing; cavitation in liquids; destruction of materials; interaction of cavitation and corrosion ; mechanisms of cavitation-corrosion. Each section is well-illustrated, concise and carefully documented. The final three pages contain hints for the designer, which are useful but rather short. Two recent symposia, both published in 1964 (see Wear, 8 (1965) 490) have been overlooked. No attempt has been made to scan atomic energy and aerospace reports for references to cavitation caused by liquid metals. The literature, from the classical paper by Euler up to 1964. can be readily traced and studied with the aid of this survey. G. Sa. Einfiihrung in die Schmiertechnik, Teil II: Schmierstoffe und Schmierungspraxis. (Introduction to Lubrication Techniques, Part II : Lubricants and Lubrication technology) By G. H. Gottner, published by Karl Marklein Verlag GmbH, Dusseldorf, 1966; 400 pp., 16~ figs., 2rx15cm,DM40.Part I of this book, covering general aspects, was reviewed in Wear, 4 (1961) 422. Testing and properties of lubricants are described in two expertly written chapters. Applicators and lubrication control form the contents of the third chapter. The lubrication of machine parts and of machines is subdivided into fourteen brief sections, ranging from sliding bearings to spacecraft. The remainder of the book deals with the organization of lubrication services in factories. The German-reading specialist will enjoy the compact form of the first two chapters that reflect the great experience of the author. As in Part I, the lack of any systematics in quoting literature gives little guidance to the (German-reading) newcomer. This second part of Gottner’s “Einftihrung” can be recommended to that large section of the technical community interested mainly in concise information on concepts used in lubrication engineering. G. Sa. Weal’,
IO
(‘967)
417-419
LITERATURE AND CURRENT EVENTS Staatlichen Materialprtifungsanstalt Technischen Hochschule Stuttgart.) See also Wear, g (1966) 282.
an der
Impact Wear Tests on Steel. (in German) H. Uetz and H. Breckel, MateriaZprii&ng. 8 (IO) (1966) 361-367; 16 figs., 14 refs. Impact wear tests have been performed with the materials C15 against C15 and C67H against C67H on a rotary impact wear testing machine with impact speeds of 3-12 m/set and impact angles of go” and 45”. The influences of speed, of the radius of the striking specimen, and of the mass of the struck specimen on impact force, impact duration, impact coefficient and wear for a number of impacts up to 20,000 have been determined. Wear of Elastomers as a Function of Tensile Strength at High Velocities of Deformation. (in German) R. Ecker, MateriaZ+i~j%ng, 8 (IO) (1966) 368-374; 6 figs., I table, 2g refs. (Transla-
tion available from author; Bayer AG, Leverkusen.) In an earlier communication the author defined wear, especially with tyres, as a thermal oxidative process caused by a mechanical tensile rupture at high deformation rates, in which the visco-elastic data play a decisive role. The present article deals with the results of experiments on 6 elastomers. The tensile strength was determined within a temperature range of zo-140°C at strain rates of ~o-zo,ooo~/~ per second. Since wear is a consequence of frictional processes, the coefficients of friction, dependent on temperature, were tested on dry, wet and iced asphalt fine-concrete tracks. From these test results an empirical relation is established between wear, friction, visco-elastic properties, tensile strength at high strain which makes it rate, and temperature, possible to predetermine the abrasion behaviour of a vulcanisate in laboratory tests.
Wear.
IO (1967) 410-417
New Books, Documentation Book
reviews
WerkstoffzerstGrung durch Kavitation. By H. H. Piltz, published by VDI-Verlag 382 refs., DIN A 5, DM 19.80.
GmbH,
Dusseldorf,
1966; g2 pp., 42 figs.,
17 tables,
Dr. Piltz has written a thesis on cavitation under the guidance of Professor H. Wiegand (Darmstadt, 1963). This systematic literature review is an additional result of his studies. The whole field is subdivided into the following sections : Concepts; history; testing; cavitation in liquids; destruction of materials; interaction of cavitation and corrosion ; mechanisms of cavitation-corrosion. Each section is well-illustrated, concise and carefully documented. The final three pages contain hints for the designer, which are useful but rather short. Two recent symposia, both published in 1964 (see Wear, 8 (1965) 490) have been overlooked. No attempt has been made to scan atomic energy and aerospace reports for references to cavitation caused by liquid metals. The literature, from the classical paper by Euler up to 1964. can be readily traced and studied with the aid of this survey. G. Sa. Einfiihrung in die Schmiertechnik, Teil II: Schmierstoffe und Schmierungspraxis. (Introduction to Lubrication Techniques, Part II : Lubricants and Lubrication technology) By G. H. Gottner, published by Karl Marklein Verlag GmbH, Dusseldorf, 1966; 400 pp., 16~ figs., 2rx15cm,DM40.Part I of this book, covering general aspects, was reviewed in Wear, 4 (1961) 422. Testing and properties of lubricants are described in two expertly written chapters. Applicators and lubrication control form the contents of the third chapter. The lubrication of machine parts and of machines is subdivided into fourteen brief sections, ranging from sliding bearings to spacecraft. The remainder of the book deals with the organization of lubrication services in factories. The German-reading specialist will enjoy the compact form of the first two chapters that reflect the great experience of the author. As in Part I, the lack of any systematics in quoting literature gives little guidance to the (German-reading) newcomer. This second part of Gottner’s “Einftihrung” can be recommended to that large section of the technical community interested mainly in concise information on concepts used in lubrication engineering. G. Sa. Weal’,
IO
(‘967)
417-419