In this paper, rotating bending fatigue tests of 2024-T4 Al alloy with different oxide coatings were carried out. Compared to the uncoated and previously reported oxide coatings of aluminum alloys, the fatigue strength is able to be enhanced by using a novel oxide coating with sealing pore technology. These results indicate that the better the coating surface quality is, the more excellent the ...

In order to improve insight into the impact of mechanical stress on the winding insulation of rotating machines, for the first time simultaneous electrical and mechanical stresses were applied at a frequency as high as 100 Hz. Improving tests described in literature, vibration frequency and bending stress were chosen closer to reality such as 100 Hz and 7 N/mm2, respectively. The goal was to fi...

The stress values at the crack tip in bending reinforced concrete beams are considered. state is analytically determined with an initial and propagating crack. Equations of equilibrium a part beam cut along line compiled. These equations reduced to system two nonlinear algebraic using plane-sections hypothesis. determine zone’s height nominal for length. rest parameters expressed regarding zone...