Experimental checking the summation damages model at cyclic loading of turbines disks

The technique and results of experimental research the low-cyclic fatigue (LCF) and cyclic crack resistance of granulated nickel alloy are described. Two variants of loading cycle form are compared: triangular and M-shaped, characteristic for disks of aviation engines turbines. Quantitative estimates of influence the form of loading cycle on cyclic durability and growth rate of fatigue cracks and the empirical ratios describing this influence are received. Satisfactory convergence of experimentally received curve LCF for the M-shaped loading cycle with calculated curve of LCF on model of linear summation is shown.