Vol.9, No2, 2009, pp. 113-124
UDC 629.7.036, 621.45

Abstract

The problem of damages of aircraft engine disks, dominantly loaded by centrifugal forces of blades and own centrifugal forces is considered in this paper. The first stage low pressure compressor rotor disk of R25-300 engine has been chosen as the representative of these disks. Using Palmgreen-Miner’s hypothesis on linear accumulation of damages, damage computation of this disk for one engine start-stop cycle, was performed. During that, the spectrum of working strain amplitudes, at the point of expected crack initiation, identified by approximate Sonsino’s curves, is related with Morrow’s curves of low cycle fatigue.

Keywords: aircraft engine disks, engine start-stop cycle, stress-strain response, approximate Sonsino’s curve, damages computation