Details
| Original language | English |
|---|---|
| Pages (from-to) | 268-274 |
| Number of pages | 7 |
| Journal | International Journal of Fatigue |
| Volume | 116 |
| Early online date | 15 Jun 2018 |
| Publication status | Published - Nov 2018 |
Abstract
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.
Keywords
- Diffusion coating, Fatigue crack growth measurement, Lifetime modelling, Nickel-based superalloy, Thermo-mechanical fatigue (TMF)
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International Journal of Fatigue, Vol. 116, 11.2018, p. 268-274.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modelling of the fatigue crack growth of a coated single crystalline nickel-based superalloy under thermal mechanical loading
AU - Spachtholz, J.
AU - Affeldt, E. E.
AU - Maier, H. J.
AU - Hammer, J.
N1 - © 2018 Elsevier Ltd. All rights reserved.
PY - 2018/11
Y1 - 2018/11
N2 - 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.
AB - 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.
KW - Diffusion coating
KW - Fatigue crack growth measurement
KW - Lifetime modelling
KW - Nickel-based superalloy
KW - Thermo-mechanical fatigue (TMF)
UR - http://www.scopus.com/inward/record.url?scp=85049067236&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2018.06.015
DO - 10.1016/j.ijfatigue.2018.06.015
M3 - Article
AN - SCOPUS:85049067236
VL - 116
SP - 268
EP - 274
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -