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Simulation of a blade-to-coating dynamical contact during an abradability test

A finite element model of abradable coating rig tests was developed, allowing extensive studies on the influence of coating properties and test conditions on their performances.

The FE code was used to simulate a single contact between a blade and a part of the abradable coating.

Target and contact elements were used to model the contact between both parts.
The coupling of thermal and mechanical analyses is allowed by these elements, where the heat generation due to frictional dissipated energy is computed.

The motions of the two parts during the tests were simulated by dynamical displacements. An initial incursion of the blade into the coating was taken into account by an initial distortion of the mesh, resulting from a preliminary static calculation.

Relevant algorithms and pertinent parameters were chosen for the contact analysis, the non-linear analysis and the dynamical analysis.

The results obtained for reference coatings were dynamical fields of stresses and temperatures.

Comparisons between the maximum computed values in each studied case and the corresponding blade wear measurements showed some consistency.

Furthermore, these results contribute to explain why different test rigs work sometimes differently.

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