The Air Force's Engine Structural Integrity Program (ENSIP) requires determination of damage tolerance for jet engine components in order to allow more economical rejection criteria to be adopted. To this end, means have been developed for predicting fatique crack growth in jet engine components such as turbine disks made of nickel-based superalloys and operating at elevated temperatures. The presence of time-dependent plastic deformation greatly affects crack propagation rates, particularly at elevated temperatures and thus must be accounted for when modelling crack growth in turbine materials. The purpose of this thesis was to investigate the frequency response aspects of the Bodner-Partom constitutive law's behavior and to compare its results with those of other models and to cyclic and non-cyclic uniaxial tensile test data.
Investigation of constitutive models for predicting viscoplastic response during cyclic loading
Untersuchung von Modellen zur Vorhersage des viskoplastischen Fliessens bei zyklischer Belastung
US Government Reports ; Jun ; 1-95
1988
95 Seiten
Report
Englisch
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