Finite element modeling of abradable materials – Identification of plastic parameters and issues on minimum hardness against coating's thickness
Abradable materials are used to decrease the gas consumption of aircraft engines by minimizing the gap between the blade tips and the stator. The key idea consists in using the blades themselves to machine the gap on the abradable coating. The best compromise between soft and hard coating proper...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2008-07-01
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| Series: | International Journal for Simulation and Multidisciplinary Design Optimization |
| Subjects: | |
| Online Access: | https://www.ijsmdo.org/articles/smdo/pdf/2008/03/asmdo3608.pdf |
| Summary: | Abradable materials are used to decrease the gas consumption of
aircraft engines by minimizing the gap between the blade tips and the
stator. The key idea consists in using the blades themselves to machine the
gap on the abradable coating. The best compromise between soft and hard
coating properties has to be reached to avoid blades wear and prevent
coating erosion by gas flux and particles. The plastic parameters of
abradable coating were identified by using an optimization process directly
connected to FEA. The first order optimization method (conjugate gradient
strategy + golden section algorithm) was applied to achieve the optimal
solution. A good agreement was found between experimental and numerical
results. The plastic parameters were used to study the hardness variability
of abradable materials with the coating thickness. Surprisingly, a minimum
hardness value was found while it was expected that hardness should be
always decreasing with thickness. It has been demonstrated that this minimum
is produced by the boundary conditions influence on hardness measurement.
This research work was completed within the Seal-Coat project funded by the
European Commission under the FP5 Growth Program. |
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| ISSN: | 1779-627X 1779-6288 |