| Autor: |
P. T. Kantzos, D. J. Greving, M. N. Menon |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Volume 7A: Structures and Dynamics. |
| DOI: |
10.1115/gt2016-56072 |
| Popis: |
An isothermal model for creep rupture prediction of equiaxed gas turbine airfoils is presented. It provides a family of curves linear in log-log space between applied tensile stress and rupture time. Each curve represents a specific temperature. The model accommodates changes in slope with temperature by a temperature-time interaction term. In addition, it can capture phenomena that are solely temperature dependent such as thickness (grain size) effect observed in rupture of equiaxed turbine blade alloys. It represents an improvement over Larson-Miller (LM) formulation in which time and temperature are combined into a single parameter and assumed to have a unique value dependent only on the applied stress. It is also more accurate and less conservative than the LM model when extrapolating to lower stresses at a specific temperature, if the LM model shape is non-linear, curving downward. The isothermal formulation better preserves the accuracy of extrapolation and can model phenomena affecting stress rupture which are exclusively temperature dependent. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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