| Sol No.: |
Navy STTR FY2010.A |
| Topic No.: |
N10A-T010 |
| Topic Title: |
Analysis and Modeling of Foreign Object Damage (FOD) in Ceramic Matrix Composites (CMCs) |
| Proposal No.: |
N10A-010-0559 |
| Firm: |
N&R Engineering
6659 Pearl Road
Suite #201
Cleveland, Ohio 44130-3821 |
| Contact: |
Vinod Nagpal |
| Phone: |
(440) 845-7020 |
| Web Site: |
www.nrengineering.com |
| Abstract: |
The Phase I deliverable will be a physic-based model which represents a CMC gas turbine component concomitantly at the material level and the structural level. This model will be probabilistically analyzed to account for the uncertainties in material properties and the uncertainties in the size and impact velocities of possible foreign objects (FOD). A ceramic material must display sufficient capability to withstand the degrading effects that arise from external events such as FOD impacts. In addition to withstanding impact events, the CMC must be able to resist crack propagation through the thickness resulting from FOD induced surface flaws. Further issues of concern: 1) the possibility of impacting materials scratching off the environmental barrier coating (EBC) coating and the subsequent consequences. 2) Given constant environmental attack of a CMC combustor liner due to the vaporization of salty air/water, the rate and sizes of EBC debris that loosen and then impact on turbine nozzle guide vanes. The delivered phase I tool will provide the means to cost effectively investigate and resolve these issues in a phase II effort. An application demonstration problem is specified, such as a rotor blade or a vane. |
| Benefits: |
The delivered physics-based model will provide accurate damage quantification for ceramic matrix composite (CMC) materials by foreign object damage (FOD) impacts. This tool will assist a design engineer in determining the magnitude of the damage and subsequent residual strength of a CMC material system. The analysis and tool will provide guidance in proper design and maintenance of CMC material systems in high performance military platforms and ground power. These activities are crucial to simultaneously increasing the reliability and reducing the cost of material and component development and maintenance. |