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Materials Science and Engineering, University of Michigan

  MSE / Research / Projects / Knowledge-Oriented Materials Engineering of Layered Thermal Protection

Knowledge-Oriented Materials Engineering of Layered Thermal Protection
Collaborators: K.J. Hemker, Johns Hopkins University
Materials: Metals Ceramics
Application: Structural
Technique: Processing Characterization

This research effort is in collaboration with Johns Hopkins University, Harvard University, Princeton University, the University of California Santa Barbara and the Delphi Research Center. The main objective of NOMELT will be to develop a code that facilitates the more aggressive design of multilayered thermal barrier systems. This code will incorporate salient underlying micro-mechanical processes and permit our partners in industry to identify key material parameters and to probe the design space for improved systems. The hierarchy of models to be invoked en route to creating this design code will include: (i) hierarchical models used to predict the material property suite needed for the constituent models, (ii) constituent models, reliant on material properties from either independent measurements or hierarchical models, that characterize the thermo-mechanical phenomena occurring within each layer and at the interfaces, and (iii) a special purpose numerical program or design code that calculates the performance of a thermal barrier system subject to a single, dominant failure mechanism, as defined by the constituent models. The focus will be on a code for thermal barrier systems with a two-phase bond coat that fail by delamination along the interface between the thermally grown oxide (TGO) and the bond coat. The constituent models to be developed for this purpose will address four specific time/cycle dependent phenomena: (i) evolution of the bond coat, (ii) variations in the TGO, (iii) changes in the structure and properties of the ceramic top coat, and (iv) interfacial delamination.
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