Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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FATIGUE STRENGTH LOSS ESTIMATION OF COMPRESSOR BLADES UNDER FOREIGN OBJECT DAMAGE

Nikhamkin M.S. 1 Limonova V.M. 1 Hamidulina A.K. 1
1 Perm National Research Polytechnic University
A technique is developed to estimate fatigue strength loss of aircraft engine compressor blades under foreign object damage. The technique gives an ability to get the fatigue strength estimation without laborious fatigue tests of real blades. The technique is based on representation of effective stress concentration as the function of geometry stress concentration factor and factor of stress concentration sensitivity. The geometry stress concen-tration factor is determined by blade damage shape and sizes. The stress concentration sensitivity factor is de-termined by material, heat treatment, surface layer characteristics. The stress concentration sensitivity factor may be experimentally found as result of routine fatigue tests of cy-lindrical shape specimens. The specimen has an annular notch as stress concentrator. Numerical analyses of stress field in the specimen and geometry stress concentration factor is carried out. It is found a dependence of geometry stress concentration factor in the specimen on radius of vertex of the notch.