Details
| Original language | English |
|---|---|
| Pages (from-to) | 25-35 |
| Number of pages | 11 |
| Journal | European Structural Integrity Society |
| Volume | 29 |
| Issue number | C |
| Publication status | Published - 2002 |
| Externally published | Yes |
Abstract
Virtually all models developed to predict thermomechanical fatigue (TMF) behaviour are limited by the fact that life prediction is based on experimental data generated under conditions significantly different from the actual service conditions of most high-temperature components. The current research strongly supports the idea that life models that are closely related to the relevant microstructural processes provide a more reliable basis for life prediction. It will be discussed how microstructural arguments can be used to extend a given life model to loading situations that cannot be simulated satisfactorily in the laboratory and/or estimate the limits within which reliable life predictions can be made. Data are presented that demonstrate that non-conservative life prediction may result despite a seemingly excellent correlation of model predictions with experimentally obtained TMF life. It is emphasized that TMF tests designed to validate a life model should focus on revealing the presence of potential couplings between the various damage mechanisms such as creep, environmental degradation and cyclic plasticity.
Keywords
- crack growth, crack initiation, cyclic stress-strain response, damage evolution, environmental effects, life prediction, microstructure, modelling, thermomechanical fatigue
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Mechanics of Materials
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In: European Structural Integrity Society, Vol. 29, No. C, 2002, p. 25-35.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Validating the predictive capabilities
T2 - A key issue in modelling thermomechanical fatigue life
AU - Maier, H. J.
AU - Christ, H. J.
PY - 2002
Y1 - 2002
N2 - Virtually all models developed to predict thermomechanical fatigue (TMF) behaviour are limited by the fact that life prediction is based on experimental data generated under conditions significantly different from the actual service conditions of most high-temperature components. The current research strongly supports the idea that life models that are closely related to the relevant microstructural processes provide a more reliable basis for life prediction. It will be discussed how microstructural arguments can be used to extend a given life model to loading situations that cannot be simulated satisfactorily in the laboratory and/or estimate the limits within which reliable life predictions can be made. Data are presented that demonstrate that non-conservative life prediction may result despite a seemingly excellent correlation of model predictions with experimentally obtained TMF life. It is emphasized that TMF tests designed to validate a life model should focus on revealing the presence of potential couplings between the various damage mechanisms such as creep, environmental degradation and cyclic plasticity.
AB - Virtually all models developed to predict thermomechanical fatigue (TMF) behaviour are limited by the fact that life prediction is based on experimental data generated under conditions significantly different from the actual service conditions of most high-temperature components. The current research strongly supports the idea that life models that are closely related to the relevant microstructural processes provide a more reliable basis for life prediction. It will be discussed how microstructural arguments can be used to extend a given life model to loading situations that cannot be simulated satisfactorily in the laboratory and/or estimate the limits within which reliable life predictions can be made. Data are presented that demonstrate that non-conservative life prediction may result despite a seemingly excellent correlation of model predictions with experimentally obtained TMF life. It is emphasized that TMF tests designed to validate a life model should focus on revealing the presence of potential couplings between the various damage mechanisms such as creep, environmental degradation and cyclic plasticity.
KW - crack growth
KW - crack initiation
KW - cyclic stress-strain response
KW - damage evolution
KW - environmental effects
KW - life prediction
KW - microstructure
KW - modelling
KW - thermomechanical fatigue
UR - http://www.scopus.com/inward/record.url?scp=77957036260&partnerID=8YFLogxK
U2 - 10.1016/S1566-1369(02)80059-0
DO - 10.1016/S1566-1369(02)80059-0
M3 - Article
AN - SCOPUS:77957036260
VL - 29
SP - 25
EP - 35
JO - European Structural Integrity Society
JF - European Structural Integrity Society
SN - 1566-1369
IS - C
ER -