Analytic Creep Durability of Rotating Uniform Disks

[摘要] 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.

[学科分类] 力学，机械学