Investigation of mechanical properties of Armco-iron during fatigue test

А. Vshivkov, А. Prokhorov, S. Uvarov, O. Plekhov
2016 Mechanics of Advanced Materials and Modern Processes  
In this paper the mechanical properties of armco-iron are studied experimentally. The ultrasonic testing machine USF-2000 was used to carry out fatigue tests involving 10 6 -10 10 loading cycles. The frequency of loading is 19.5 ± 0.5 kHz. Based on the experimental data, the Wöhler curve was obtained. Methods: For the analysis of physical condition, two new sensors were designed, one of which measured the electric resistance of the sample and the other measured the magnetic permeability. Second
more » ... measuring method can be applied to ferromagnetic materials only, though it may be useful for studying the mechanical properties of metals in general. Results: It was shown that the significant changes in physical processes accompanying the evolution of structural defects in the material were observed in the final stages of the experiment. Conclusions: The applied measurement techniques allowed us to exactly determine the time of fatigue crack initiation below the surface the material, which cannot be monitored by the standard optic methods.
doi:10.1186/s40759-016-0009-6 fatcat:y2ex43s46nh63bqk32jbipuwze