Life Prediction Model Incorporating Environmental Effects for S300 Sylramic-iBN/SiC Ceramic Matrix Composites

MR&D’s objective in the proposed research will be to execute a Technical effort to study existing data and to develop the appropriate representative S300 CMC material samples, test samples and test types, and to do the appropriated oxidation and mechanical test studies. Establish oxidation rates as a function of time, temperature and stress level for S300 CMC. Test will include tension at room temperature after oxidizing environments at selected pesting temperatures to get degraded and un-degraded elastic constants and strengths. Tensile creep and creep rupture above and below the matrix cracking strength at elevated temperature to get degraded and non degraded life time do to oxidation. Demonstrate through mathematical composite materials analysis the ability to predict degraded CMC thermo-elastic constants and residual material strengths for the most typical defects. Then use those properties locally in finite element modeling thus incorporating the NDE data into the structural models to predict the CMC component thermo-structural response under required loads. MR&D will provide a life prediction tool that will integrate with CLIP or Ansys. BENEFIT: Commercialization consists of incorporating CMC components in commercial jet engines and land based turbines. CMCs will allow the jet engines and power turbines to run at higher temperatures and thus higher efficiency with the added benefit of reduced emissions.