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Modelling of the fatigue crack growth of a coated single crystalline nickel based superalloy under thermal mechanical loading

  • The focus of this paper is the simulation of fatigue crack growth of the coated single crystalline nickel-based superalloy PWA 1484 under thermal mechanical loading. Thus, two physical models are superimposed in terms to firstly calculate the deformation behavior under instationary thermal and mechanical loading (TMF) and secondly to model crack propagation after initial brittle cracking of the coating layer on the basis of cyclic crack tip opening displacement (CTOD). All material parameters implemented in the models were evaluated from monotonic isothermal tensile and creep tests as well as from isothermal low cycle fatigue (LCF) experiments. The calculated fatigue crack growth was validated by in situ crack growth measurements using the beachmark technique. Hence, crack propagation initiated by the brittle coating system closely to the experimental results using rectangular flat specimen geometry instead of corner-crack (CC) specimens. The comparison of the simulated lifetimes to the experimental results provides remarkable accuracy of the physically-based lifetime model.

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Metadaten
Author:Josef SpachtholzGND, Ernst Eugen AffeldtGND, Hans Jürgen Maier, Joachim Hammer
DOI:https://doi.org/10.1016/j.ijfatigue.2018.06.015
Parent Title (English):International Journal of Fatigue
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2018
Release Date:2022/03/18
Tag:DISLOCATION CLIMB; Deformation; Diffusion coating; Fatigue crack growth measurement; HARD PARTICLES; KINETICS; Lifetime modelling; Nickel-based superalloy; TIP; Thermo-mechanical fatigue (TMF)
Volume:116
Issue:November
First Page:268
Last Page:274
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Werkstoffprüfung und Metallographie
Begutachtungsstatus:peer-reviewed
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG