Initial Fatigue Life Estimation in Aero Engine Discs

Strain Posavljak
Katarina Maksimović

This paper deals with the holes on aero engine discs. Flat discs with four, six and eight eccentrically arranged holes were observed. The estimation of their low cycle fatigue life was carried out in conditions of variable revolutions per minute. The blocks of variable revolutions per minute of a low pressure compressor rotor of one aero engine were used. Four blocks were observed during landing and one block was observed during a specific training flight. It is shown how the low cycle fatigue of discs depends on the assigned geometry and material characteristics. It is also shown how the solutions of simple problems can be useful in design of fatigue resistant aero engine discs.

Key words: aero engine, disc, material fatigue, low cycle fatigue, fatigue strength, life cycle estimation, finite element
method.