Change in physicomechanical properties of steel D1604AT15 during fatigue at different loading frequencies

Results are presented in a statistical arrangement for studying the effect of loading frequency on the fatigue life in bending of plates with a stress concentrator. The nature of change in microhardness, electrical conductivity, dislocation density, and block dimensions during fatigue at frequencies of 2.8, 8.8, and 18 kHz has been demonstrated. It has been established that in spite of some qualitative difference the main indicators of fatigue at these frequencies are retained.S. M. Kirov Belorussian Technology Institute, Minsk. Translated from Problemy Prochnosti, No. 10, pp. 31–34, October, 1989.     

Effect of loading frequency on the physicomechanical properties of aluminum alloys during fatigue

A procedure and specially developed equipment are described for performing fatigue tests at frequencies of 180 Hz, 2.8, 8.8, 17.6, and 44 kHz and with random loading. It is shown that with an increase in loading frequency the cyclic endurance of the test materials increases. The nature of the occurrence of the fatigue process is traced from the change in dislocation density, sizes of blocks, macrostresses, microhardness, and electrical conductivity. It is established that it is not monotonic.Translated from Problemy Prochnosti, No. 10, pp. 61–64, October, 1992.     

Polarized laser light reflection by polymeric films modified with TiO2 or silver nanoparticles

The ability of a polymeric polyvinyl alcohol film modified by TiO₂ or silver nanoparticles to scatter, reflect and transmit incident polarized radiation and to form an illumination background close to diffuse scattering with the minimal power losses were studied. The article is published in the original.