Year: 2013
Type: conference-paper
Abstract: This paper describes the stress analysis and life assessment of a first-stage air-cooled blade made of the superalloy IN738LC.Three-dimensional finite element thermal and stress analyses of the blade were carried out for the steady-state full-load operation.The results of these analyses were used for determination of the regions where the combination of high temperature and high tensile stress was sufficient for significant creep-fatigue crack growth.Accordingly, a critical point at the leading edge of the airfoil, near the root, was selected for crack modeling.With the assumption of occurrence of small-scale creep and thermal-fatigue during each start-stop cycle, the pertinent crack tip parameters were calculated using the energy domain integral method.An incremental crack growth scheme was considered and the total life for the growth of a 0.5mm surface crack to a 5mm through-thickness crack was calculated.
Authors: Masoumeh Mirzaei, Reza Karimi
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1542226020