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Thermo-mechanical fatigue crack propagation experiments in Inconel 718

Jacobsson, Lars LU ; Persson, Christer LU and Melin, Solveig LU (2009) In International Journal of Fatigue 31(8-9). p.1318-1326
Abstract
An experimental test facility was developed to perform thermo-mechanical fatigue crack growth experiments. The thermal cycles were generated using hot and cold air flows distributed by a nozzle onto the test specimen. With the equipment it was possible to obtain TMF cycles with cycle times of 120 s with less than 10 °C temperature variation over the measurement length of the sample, cycling between 200 °C and 550 °C. The equipment allows TMF crack propagation tests up to, at least, 600 °C. The crack length and the crack closure level were determined using the potential drop technique. Thermo-mechanical fatigue crack propagation experiments were performed in-phase and out-of-phase with various R-values on samples of Inconel 718. Cylindrical... (More)
An experimental test facility was developed to perform thermo-mechanical fatigue crack growth experiments. The thermal cycles were generated using hot and cold air flows distributed by a nozzle onto the test specimen. With the equipment it was possible to obtain TMF cycles with cycle times of 120 s with less than 10 °C temperature variation over the measurement length of the sample, cycling between 200 °C and 550 °C. The equipment allows TMF crack propagation tests up to, at least, 600 °C. The crack length and the crack closure level were determined using the potential drop technique. Thermo-mechanical fatigue crack propagation experiments were performed in-phase and out-of-phase with various R-values on samples of Inconel 718. Cylindrical specimens with a small starter crack were cycled in nominal total strain control. The crack propagation rate was determined and the correlation to the effective J-integral range, ΔJeff, corrected for crack closure presented. The fracture surfaces showed a dominance of trans-granular crack propagation with striations, indicating a low degree of time dependency in the procedure. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
International Journal of Fatigue
volume
31
issue
8-9
pages
1318 - 1326
publisher
Elsevier
external identifiers
  • scopus:67349163729
  • wos:000267401900011
ISSN
1879-3452
DOI
10.1016/j.ijfatigue.2009.02.041
language
English
LU publication?
yes
id
16a10086-5c73-4760-934c-aa21764d8ddd (old id 1529647)
date added to LUP
2010-02-04 13:46:29
date last changed
2017-09-24 04:40:01
@article{16a10086-5c73-4760-934c-aa21764d8ddd,
  abstract     = {An experimental test facility was developed to perform thermo-mechanical fatigue crack growth experiments. The thermal cycles were generated using hot and cold air flows distributed by a nozzle onto the test specimen. With the equipment it was possible to obtain TMF cycles with cycle times of 120 s with less than 10 °C temperature variation over the measurement length of the sample, cycling between 200 °C and 550 °C. The equipment allows TMF crack propagation tests up to, at least, 600 °C. The crack length and the crack closure level were determined using the potential drop technique. Thermo-mechanical fatigue crack propagation experiments were performed in-phase and out-of-phase with various R-values on samples of Inconel 718. Cylindrical specimens with a small starter crack were cycled in nominal total strain control. The crack propagation rate was determined and the correlation to the effective J-integral range, ΔJeff, corrected for crack closure presented. The fracture surfaces showed a dominance of trans-granular crack propagation with striations, indicating a low degree of time dependency in the procedure.},
  author       = {Jacobsson, Lars and Persson, Christer and Melin, Solveig},
  issn         = {1879-3452},
  language     = {eng},
  number       = {8-9},
  pages        = {1318--1326},
  publisher    = {Elsevier},
  series       = {International Journal of Fatigue},
  title        = {Thermo-mechanical fatigue crack propagation experiments in Inconel 718},
  url          = {http://dx.doi.org/10.1016/j.ijfatigue.2009.02.041},
  volume       = {31},
  year         = {2009},
}