Fatigue life defining of aircraft engine disks

Abstract

Aircraft engine disks, dominantly loaded by centrifugal forces of blades and own centrifugal forces, are subject of this paper. One real disk was observed as their representative. Its fatigue life was defined in equivalent cycles. “Consumption” of equivalent cycles of this disk, during engine ground controls and flights described by blocks of rotation frequency, was analyzed. Special attention is devoted to increased “consumption” of equivalent cycles in the case of rotation frequency above 100 %. It was shown that fatigue life defining of aircraft engine disks, in equivalent cycles, is better than defining in flight hours.