Continuous fiber ceramic composite materials (CFCCs) are being considered for an increasing number of commercial applications. They provide the potential for lighter, stronger, more corrosion-resistant components that can perform at higher temperature for long periods of time. Global competitiveness demands a shortening of the time for CFCC commercialization. Thus, considerable efforts has been expended to develop and improve the materials, and to a lesser extent, to develop component design methods and data bases of engineering properties. To shorten the time to commercialization, project efforts must be integrated, while balancing project resources between material development and engineering design. Currently a good balance does not exist for most materials development projects. To rectify this imbalance, improvements in engineering design and development technologies must be supported and accelerated, with a focus on component issues. This will require project managers to give increasing emphasis to component design needs in addition to their current focus on material development.
Oxide-oxide continuous fiber ceramic composites (CFCCs) are being developed by Babcock & Wilcox (B&W) for a number of industrial applications including gas turbine components. Funding for this work is from the U.S. DoE’s CFCC, Ceramic Stationary Gas Turbine (CSGT) and Advanced Turbine Systems (ATS) Programs. A description of the oxide-oxide CFCCs being developed by B&W and their applicability to gas turbine combustor liners will be presented. Results of thermal and stress analyses performed for a combustion rig test at Solar Turbines as part of the CSGT Program and for a preliminary applications assessment for Allison Engine Company as part of the ATS Program will be presented.
With the aid of elementary beam theory a Lagrangian equation of motion was developed to relate the crack velocity to cleavage energy in a double-cantilevered single-crystal specimen when shear contributes significantly to the cleavage energy. For a constant cleavage energy the equation predicts that the square of crack length is proportional to time when the crack is long with respect to transverse specimen dimensions. For shorter cracks, crack length is proportional to time.
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