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Creep-Rupture Behavior Of An Oxide/Oxide Ceramic Matrix Composite At Elevated Temperatures In Air And Steam Environments, Lee B. Harlen
Creep-Rupture Behavior Of An Oxide/Oxide Ceramic Matrix Composite At Elevated Temperatures In Air And Steam Environments, Lee B. Harlen
Theses and Dissertations
Oxide/oxide ceramic matrix composites (CMCs) are being considered for applications such as jet engine combustion chambers and afterburner flaps. Nextel™ 720/A (N720/A), an oxide/oxide CMC with an alumina matrix and no interphase at the fiber-matrix interface, was developed specifically to provide improved long-term properties and performance at 1200°C. This study focused on experimental investigation of creep behavior of N720/A [0/90] at elevated temperatures in laboratory air and in 100% steam environment. Monotonic tensile tests to failure were performed at 23, 1200, and 1330°C. Ultimate tensile strength (UTS) values were established and monotonic stress-strain curves were produced. Creep-rupture tests at 1200°C …
Monotonic And Fatigue Behavior Of 2-D Woven Ceramic Matrix Composite At Room And Elevated Temperatures (Blackglas/Nextel 312), Musa Al-Hussein
Monotonic And Fatigue Behavior Of 2-D Woven Ceramic Matrix Composite At Room And Elevated Temperatures (Blackglas/Nextel 312), Musa Al-Hussein
Theses and Dissertations
This study investigated the monotonic tension and compression and the tension-tension and tension-compression fatigue loading of Blackglas/Nextel 312 woven CMC at room temperature and at 760 degrees centigrade. Young's Modulus and strain variation were evaluated. S-N curves were obtained for room and elevated temperatures. The ultimate tensile stress was lower at the elevated temperature and it was higher in the compression test. Failure-strain was higher at the elevated temperature in both tension and compression tests. There was no significant change in Young's Modulus at the elevated temperature. Also, there was no difference in the number of cycles to failure at …