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Thermal barrier coating life prediction model development (Document No: 19870002459)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Demasi, J. T. |
| Copyright Year | 1986 |
| Description | A methodology is established to predict thermal barrier coating life in a environment similar to that experienced by gas turbine airfoils. Experiments were conducted to determine failure modes of the thermal barrier coating. Analytical studies were employed to derive a life prediction model. A review of experimental and flight service components as well as laboratory post evaluations indicates that the predominant mode of TBC failure involves thermomechanical spallation of the ceramic coating layer. This ceramic spallation involves the formation of a dominant crack in the ceramic coating parallel to and closely adjacent to the topologically complex metal ceramic interface. This mechanical failure mode clearly is influenced by thermal exposure effects as shown in experiments conducted to study thermal pre-exposure and thermal cycle-rate effects. The preliminary life prediction model developed focuses on the two major damage modes identified in the critical experiments tasks. The first of these involves a mechanical driving force, resulting from cyclic strains and stresses caused by thermally induced and externally imposed mechanical loads. The second is an environmental driving force based on experimental results, and is believed to be related to bond coat oxidation. It is also believed that the growth of this oxide scale influences the intensity of the mechanical driving force. |
| File Size | 8828522 |
| Page Count | 216 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870002459 |
| Archival Resource Key | ark:/13960/t21c6vz2k |
| Language | English |
| Publisher Date | 1986-11-05 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Turbine Blades Life Durability Thermal Insulation Failure Modes Cyclic Loads Airfoils Thermodynamics Gas Turbines Ceramic Coatings Predictions Spallation Protective Coatings Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
