Details
| Original language | English |
|---|---|
| Pages (from-to) | 147-165 |
| Number of pages | 19 |
| Journal | Sadhana - Academy Proceedings in Engineering Sciences |
| Volume | 28 |
| Issue number | 1-2 |
| Publication status | Published - 2003 |
| Externally published | Yes |
Abstract
An existing extensive database on the isothermal and thermomechanical fatigue behaviour of high-temperature titanium alloy IMI 834 and dispersoidstrengthened aluminum alloy X8019 in SiC particle-reinforced as well as unreinforced conditions was used to evaluate both the adaptability of fracture mechanics approaches to TMF and the resulting predictive capabilities of determining material life by crack propagation consideration. Selection of the correct microstructural concepts was emphasised and these concepts were, then adjusted by using data from independent experiments in order to avoid any sort of fitting. It is shown that the cyclic J-integral (ΔJeff concept) is suitable to predict the cyclic lifetime for conditions where the total crack propagation rate is approximately identical to pure fatigue crack growth velocity. In the case that crack propagation is strongly affected by creep, the creep-fatigue damage parameter ΔCF introduced by Riedel can be successfully applied. If environmental effects are very pronounced, the accelerating influence of corrosion on fatigue crack propagation can no longer implicitly be taken into account in the fatigue crack growth law. Instead, a linear combination of the crack growth rate contributions from plain fatigue (determined in vacuum) and from environmental attack is assumed and found to yield a satisfactory prediction, if the relevant corrosion process is taken into account.
Keywords
- Fatigue crack propagation, Fracture mechanics, IMI 834, Life prediction, Thermomechanical fatigue, X8019
ASJC Scopus subject areas
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In: Sadhana - Academy Proceedings in Engineering Sciences, Vol. 28, No. 1-2, 2003, p. 147-165.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Thermomechanical fatigue - Damage mechanisms and mechanism-based life prediction methods
AU - Christ, H. J.
AU - Jung, A.
AU - Maier, H. J.
AU - Teteruk, R.
PY - 2003
Y1 - 2003
N2 - An existing extensive database on the isothermal and thermomechanical fatigue behaviour of high-temperature titanium alloy IMI 834 and dispersoidstrengthened aluminum alloy X8019 in SiC particle-reinforced as well as unreinforced conditions was used to evaluate both the adaptability of fracture mechanics approaches to TMF and the resulting predictive capabilities of determining material life by crack propagation consideration. Selection of the correct microstructural concepts was emphasised and these concepts were, then adjusted by using data from independent experiments in order to avoid any sort of fitting. It is shown that the cyclic J-integral (ΔJeff concept) is suitable to predict the cyclic lifetime for conditions where the total crack propagation rate is approximately identical to pure fatigue crack growth velocity. In the case that crack propagation is strongly affected by creep, the creep-fatigue damage parameter ΔCF introduced by Riedel can be successfully applied. If environmental effects are very pronounced, the accelerating influence of corrosion on fatigue crack propagation can no longer implicitly be taken into account in the fatigue crack growth law. Instead, a linear combination of the crack growth rate contributions from plain fatigue (determined in vacuum) and from environmental attack is assumed and found to yield a satisfactory prediction, if the relevant corrosion process is taken into account.
AB - An existing extensive database on the isothermal and thermomechanical fatigue behaviour of high-temperature titanium alloy IMI 834 and dispersoidstrengthened aluminum alloy X8019 in SiC particle-reinforced as well as unreinforced conditions was used to evaluate both the adaptability of fracture mechanics approaches to TMF and the resulting predictive capabilities of determining material life by crack propagation consideration. Selection of the correct microstructural concepts was emphasised and these concepts were, then adjusted by using data from independent experiments in order to avoid any sort of fitting. It is shown that the cyclic J-integral (ΔJeff concept) is suitable to predict the cyclic lifetime for conditions where the total crack propagation rate is approximately identical to pure fatigue crack growth velocity. In the case that crack propagation is strongly affected by creep, the creep-fatigue damage parameter ΔCF introduced by Riedel can be successfully applied. If environmental effects are very pronounced, the accelerating influence of corrosion on fatigue crack propagation can no longer implicitly be taken into account in the fatigue crack growth law. Instead, a linear combination of the crack growth rate contributions from plain fatigue (determined in vacuum) and from environmental attack is assumed and found to yield a satisfactory prediction, if the relevant corrosion process is taken into account.
KW - Fatigue crack propagation
KW - Fracture mechanics
KW - IMI 834
KW - Life prediction
KW - Thermomechanical fatigue
KW - X8019
UR - http://www.scopus.com/inward/record.url?scp=0037673924&partnerID=8YFLogxK
U2 - 10.1007/BF02717131
DO - 10.1007/BF02717131
M3 - Article
AN - SCOPUS:0037673924
VL - 28
SP - 147
EP - 165
JO - Sadhana - Academy Proceedings in Engineering Sciences
JF - Sadhana - Academy Proceedings in Engineering Sciences
SN - 0256-2499
IS - 1-2
ER -