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Use of continuous fiber reinforced ceramic matrix composites (FRCMC) for turbopump hot section components offers a number of benefits. The performance benefits of increased turbine inlet temperature are apparent and readily quantifiable. Perhaps less obvious are the potential benefits of increased component life. At nominal turbopump operating conditions, FRCMC offer increased operating temperature margin relative to conventional materials. This results in potential for significant life enhancement. Other attributes (e.g., thermal shock resistance and high cycle fatigue endurance) of FRCMC provide even greater potential to improve life and reduce maintenance requirements. Silicon carbide (Sic) matrix composites with carbon fibers (C/SiC) do not degrade when exposed to hydrogenrich steam for 10 hours at 1200°C. This FRCMC is resistant to thermal shock transients far in excess of those anticipated for advanced, high temperature turbomachinery.

Activities within the Society of Automotive Engineers originating circa 1966 in Division 4 of the Iron and Steel Technical Committee Said the foundation for the contemporary approach to cumulative fatigue damage analysis and component lifetime predictive techniques. Previous and current activities of the Division 4 successor, the Fatigue Design and Evaluation Committee, have established the local stress-strain approach to ground vehicle durability as the industry-accepted methodology for fatigue design of critical components and structures subject to cyclic loading. This paper outlines the chronology of significant events and individuals within the Society of Automotive Engineers fatigue community that have advanced our comprehension, and offered solutions to the rather complex problem of durability by design.