Fatiga de álabes

Fatigue Analysis of a Gas Turbine Rotating Blade with Thermal Barrier Coating
R. García-Illescas , Z. Mazur C.
1 1 2

Turbomachinery Dept., Mexican Electric Research Institute

Reforma 113 Col.Palmira, Cuernavaca, Mor., México, e-mail: rgi@iie.org.mx
2

Turbomachinery Dept., Mexican Electric Research Institute

Reforma 113 Col. Palmira, Cuernavaca, Mor., México, e-mail:mazur@iie.org.mx

Abstract

Useful life estimation of a gas turbine moving blade made of IN738LC was carried out under uniaxial and multiaxial fatigue criteria. The fatigue analysis was done from a previous 3Dfinite

element analysis where thermal and mechanical stress calculation at high temperatures was done. The simulations considered steady and transient state during normal start ups andshutdowns. Several load histories with different cooling conditions producing different stresses and strains in the blade were considered in the numerical simulations. A thermal barrier The effect ofcoating was also considered in contrast to simple blade without such coating.

high temperatures on the blade material calculations is shown in this study as in the stress analysis as in the fatiguecalculations. This study is mainly focused on two different critical

zones in the blade: the leading edge at middle of the height and an inner cooling channel, where high stresses were found. Suchcritical zones found in numerical analysis are the same

found during the service life. The benefit of the presence of a coating in the blade in the fatigue life estimation is shown.

Useful lifeestimation of a gas turbine moving blade made of IN738LC was carried out under uniaxial and multiaxial fatigue criteria. The fatigue analysis was done from a previous 3D finite

element analysis wherethermal and mechanical stress calculation at high temperatures was done. The simulations considered steady and transient state during normal start ups and

shutdowns. Several load histories with...