Evaluation of destructive rotation frequency of turbo-machine disks applying deformation criterion with LS-DYNA software

Aeronautical and Space-Rocket Engineering

Thermal engines, electric propulsion and power plants for flying vehicles


Аuthors

Semenova A. S.*, Gogaev G. P.**

A.Lyulka Design Bureau - a branch of the Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia

*e-mail: anna.semenova.lulka@gmail.com
**e-mail: gogaevgeorge@rambler.ru

Abstract

Turbine disk is the main part of the aircraft engine, since its failure may lead to either emergency or catastrophic situation. According to NTD the GTE load-bearing capacity is being evaluated by the destructive rotation frequency margin, applying the limit equilibrium theory, at destruction along meridian section fr om tangential stress, and at destruction along some cylindrical partially meridian section fr om tangential stress.

Factors affecting the disk load-bearing capacity are the meridian section shape, scheme of destruction (along meridian, cylindrical or mixed sections), the presence of stress concentrators, and the material properties. Allowance for these factors effect on the disk load-bearing capacity while applying the lim it equilibrium theory is not practical.

Destruction of most metals is the result of damages accumulation. Two main mechanism of damages such as voluminous damage (pores growth and merge) and shear damage (cracks growth and merge) are discerned. A model of damages accumulation based on shear damage, i.e. destruction criterion on maximum accumulated plastic deformation, can be employed for numerical determination of the destructive rotation frequency of the turbo-machine disks from nickel alloys.

The plastic flow theory can be employed to determine the disk lim it rotation frequency. A modified version of the classical flow theory with isotropic hardening makes allows implement an arbitrary stress-strain dependence given in the form of strain diagrams.

Several series of calculated overspeed test were performed. The effect of the following factors on the calculated destructive frequency was being studied:

– loading speed;

– the finite elements mesh size.

The computational studies results revealed that the finite element size and mesh computing time did not practically affect the convergence of computation and experiment.

The computational studies results revealed that the finite element size and mesh computing time did not practically affect the convergence of computation and experiment. However, the smaller the grid, the more accurately the cracks development on the disk can be traced.

The obtained computation results were validated based on the results of the overspeed test performed with the low-pressure turbine disk of AL41F-1C engine at the Central Institute of Aviation Motors (CIAM) stand.

Keywords:

turbo-machines disks, destructive rotation frequency, deformation criterion

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