Tracking Initial Cracks in Turbojet Engine Disks and Possibilities of Postponing their Occurrence

 

Strain Posavljak

Katarina Maksimović

Miodrag Janković

 

The first stage disk of the low pressure compressor rotor of one turbojet engine was observed in this paper as a critical component. The maintenance costs of the engine were increased due to premature initial cracks in this disk and subsequent interventions. The probabilities of occurrence of initial cracks on two types of the observed disk were described in the paper by Weibull expressions used for determining time intervals of ultrasonic control. The damage computation results for one start-stop engine cycle were used as a basis to show how and for how long occurrence of initial cracks in disks could be postponed and how replacing disks in an engine service life can be eliminated.

Key words: aircraft engine, turbojet engine, disk, damage, crack, initial crack, computation method, Weibull distribution.