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Long-Term Creep and Creep Rupture Behavior of Woven Ceramic Matrix CompositesTensile creep behavior of SiC/SiNC ceramic matrix composites at elevated temperatures and at various stress levels have been investigated for turbine engine applications. The objective of this research is to present creep behavior of SiC/SiCN composites at stress levels above and below the monotonic proportional limit strength and predict the life at creep rupture conditions. Tensile creep-rupture tests were performed on an Instron 8502 servohydraulic testing machine at constant load conditions up to a temperature limit of 1000 C. Individual creep curves indicate three stages such as primary, secondary, and tertiary. The creep rate increased linearly at an early stage and then gradually became exponential at higher strains. The stress exponent and activation energy were also obtained at 700 and 1000 C. The specimen lifetime was observed to be 55 hrs at 121 MPa and at 700 C. The life span reduced to 35 hrs at 143 MPa and at 1000 C. Scanning electron microscopy observations revealed significant changes in the crystalline phases and creep damage development. Creep failures were accompanied by extensive fiber pullout, matrix cracking, and debonding along with fiber fracture. The creep data was applied to Time-Temperature-Stress superposition model and the Manson-Haferd parametric model for long-time life prediction.
Document ID
20020018910
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Haque, A.
(Tuskegee Inst. AL United States)
Rahman, M.
(Tuskegee Inst. AL United States)
Mach, A.
(Tuskegee Inst. AL United States)
Jeelani, S.
(Tuskegee Inst. AL United States)
Verrilli, Michael J.
Date Acquired
August 20, 2013
Publication Date
November 1, 2001
Publication Information
Publication: HBCUs/OMUs Research Conference Agenda and Abstracts
Subject Category
Composite Materials
Report/Patent Number
P29
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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