TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Isothermal Fatigue Behavior and Damage Modeling of a High Temperature Woven PMC

[+] Author and Article Information
A. L. Gyekenyesi

NASA Glenn Research Center, MS 6-1, 21000 Brookpark Road, Cleveland, OH 44135

J. Eng. Gas Turbines Power 122(1), 62-68 (Oct 20, 1999) (7 pages) doi:10.1115/1.483176 History: Received February 25, 1998; Revised October 20, 1999
Copyright © 2000 by ASME
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Schematic of specimen geometry
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Normalized compressive modulus degradation behavior for multiple specimens at 316°C (600°F): σmax=310 MPa (45 ksi).
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Illustration of microscopic damage in a (0/90) weave: edge view
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Microscopic edge view of transverse cracks in a typical RT tensile specimen after loading to 758 MPa (110 ksi)
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Stress based isothermal fatigue life for T650-35/PMR15 (0/90) weave
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Normalized compressive modulus degradation behavior for multiple specimens at 22°C (72°F): σmax=379 MPa (55 ksi).
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Comparison of normalized compressive modulus degradation behavior between RT and ET at an equivalent stress
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Normalized compressive modulus at various maximum stresses for RT condition. Each line is an average of three specimens.
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Residual compressive strength behavior as a function of damage (i.e., current compressive modulus)
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Model versus data comparison of normalized compressive modulus as a function of cycles at 204°C (400°F)




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