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Ein miniaturisierter Kriechversuch zur Kalibrierung eines effizienten Lebensdauermodells für Hochdruckturbinenschaufeln
Author(s) -
Dresbach C.,
Wischek J.,
Bartsch M.,
Prien T.
Publication year - 2022
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.202100347
Subject(s) - creep , turbine blade , turbine , jet engine , aerodynamics , structural engineering , fracture (geology) , component (thermodynamics) , materials science , range (aeronautics) , mechanical engineering , nuclear engineering , mechanics , engineering , aerospace engineering , composite material , physics , thermodynamics
Jet engines of airplanes are designed such that in some components damage occurs and accumulates in service without being critical up to a certain level of damage. Since maintenance, repair, and component exchange are very cost‐intensive, it is necessary to predict efficiently the component lifetime with high accuracy. A former developed lifetime model, based on interpolated results of aerodynamic and structural mechanics simulations, uses material parameters estimated from literature values of standard creep experiments. For improved accuracy, an experimental procedure is developed for the characterization of the short‐time creep behavior, which is relevant for the operation of turbine blades of jet engines. To consider microstructural influences resulting from the manufacturing of thin‐walled single crystal turbine blades, small‐scale specimens from used turbine blades are extracted and tested in short‐ and medium‐time creep experiments. Based on experimental results and literature values, a creep model, which describes the fracture behavior for a wide range of creep loads, is calibrated and is now used for the lifetime prediction of turbine blades under real loading conditions.