Integrated Software to Predict Material Degradation in Special Technology Coatings

The Air Force faces challenges related to selecting, maintaining and repairing coatings that protect and enhance the performance of critical components in gas turbine engines. Coatings must maintain performance despite experiencing several degrading mechanical, thermal and chemical impacts.In Phase I, CFDRC demonstrated feasibility of a physics-based model to compute damage progression under stress from the microscale to macroscale. The team demonstrated the use of CFD to determine conditions at the surface of a part, and identified a way to link surface conditions from CFD simulations to the damage state of the material based on the stress state. In Phase II, CFDRC proposes to deliver a multiscale material modeling toolkit to predict damage leading to delamination of multilayered coating systems when subjected to harsh service environments. The response of the material system to damaging stress is modeled beginning at the length scale of the microstructure using peridynamics to predict fracture nucleation and progression. The project will validate the accuracy of the modeling toolkit to predict damage progression against a burner rig analysis of a characterized coating system. The validated model will be demonstrated on a repaired coating system to assess its applicability to challenging service applications.