In order to investigate the nature and causes of the cracked passage hole of the low-pressure turbine shaft of aero-engine during the high and low circumference compound fatigue test
the low-pressure turbine shaft crack location was examined in appearance
fracture analysis
surface inspection
metallographic organization
finite element analysis and crack expansion simulation.The results show that the low-pressure turbine shaft passage hole crack failure is a fatigue crack
which is caused by the incomplete removal of the remelting layer after the passage hole is cut by electrical discharge machining
resulting in the existence of part of the unremoved remelting layer and visible microcracks on the internal surface
and the fatigue crack sprouted and crack expansion occurred under the action of large high and low circumferential composite load
thus leading to the passage hole crack failure. The initial crack length is estimated to be between 0.2-0.3 mm by the crack expansion simulation analysis. In order to ensure the processing quality of the through oil hole
considering the poor processing accessibility of this location
it is suggested that special tooling can be designed and the machining technology can be used for processing, on the basis of ensuring the processing
fundamental eliminate the influence of the remelting layer.
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