The possibility of life and reliability enhancing of AL-31F low pressure turbine disc’s fir-tree slots by ultrasonic
hardening is considered. Having disc’s material properties studied, working stress derivation is executed which was
further used for following comparative fatigue tests. Also, Davidenkov method residual stress analysis is carried out
which showed 95.3 % change to compression stress for circumferential residual stress and 80.9 % change to compression stress for axial residual stress which proves possibility of fir-tree slots’ life and reliability enhancement by ultrasonic
hardening. Comparative fatigue tests with N = 4•10 5 cycles basis showed that the hardened samples standing out the
cycle basis during higher oscillatory amplitudes (and, thus, affecting loads) than the non-hardened basic ones.
On the Computational Viability of Quantum Optimization for PMU Placement
