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International Journal of Rotating Machinery - Volume 4 1998, Issue 4, Pages 249-256

Department of Theoretical Mechanics, Perm Federal Technical University, 29a Komsomolsky Ave., Perm 614600, GSP-45, Russia

Received 3 January 1997; Revised 29 January 1998

Copyright © 1998 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Turbine disks of aircraft engines in operation are subjected to alternating thermocyclic deformation under high temperatures. Operation gives rise to sufficiently high stresses and subsequent creep damaging effects.

In this paper we suggest an approach for describing creep rupture of a simple rotating disk due to the accumulation of creep induced microdefects. The dissipated energy of the creep deformation is considered as the measure of material damage.

The lifetime of the disk can be predicted on the basis of this approach. Both crack initiation and damage propagation to complete rupture of a disk are calculated. The analyticresults can be compared to known experimental data. The derived algorithm can beapplied to estimate the lifetime of real machinery components when creep deformations aredominant.





Autor: Yuriy Nyashin and Victor Shishlyaev

Fuente: https://www.hindawi.com/



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