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PREDICTION OF THE LIFETIME DISTRIBUTION OF HIGH‐STRENGTH COMPONENTS SUBJECTED TO FATIGUE LOADING
Author(s) -
BrücknerFoit A.,
Jäckels H.,
Quadfasel U.
Publication year - 1993
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1993.tb00127.x
Subject(s) - materials science , reliability (semiconductor) , probabilistic logic , component (thermodynamics) , structural engineering , service life , turbine , low cycle fatigue , fatigue testing , reliability engineering , fatigue limit , statistical model , composite material , engineering , mathematics , mechanical engineering , statistics , power (physics) , physics , quantum mechanics , thermodynamics
A probabilistic model is developed for predicting the lifetime distribution of a high‐strength component subjected to low cycle fatigue loading. The damage process considered consists of two consecutive stages. First, cracks are initiated from microstructural inhomogeneities such as non‐metallic inclusions. These cracks will then extend stably until final failure occurs or the component is removed from service. The probabilistic model is used to determine the maximum tolerable inclusion size for a model turbine disc. This quantity is defined as the size of the initial defect for which the number of load cycles to failure at a given reliability level exceeds the design life of the component. This maximum tolerable inclusion size is compared with the results of a deterministic lifetime analysis.