NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Effect of mission cycling on the fatigue performance of SiC-coated carbon-carbon compositesThe effects of thermal and pressure cycling on the fatigue performance of carbon-carbon composites, and the influence of mission cycling on these effects, were investigated by subjecting both virgin and mission-cycled two-dimensional specimens of SiC-coated carbon-carbon composites to fatigue tests, conducted at room temperature in three-point bending, with a stress ratio of 0.2 and a frequency of 1 Hz. It was found that the fatigue strength of C-C composites is high (about 90 percent of the ultimate flexural strength), but decreased with the mission cycling. The lowering of the fatigue strength with mission cycling is attributed to the increase in interfacial bond strength due to thermal and pressure cycling of the material. The already high sensitivity of C-C composites to stress during cyclic loading increases further with the amount of mission cycling. Results of NDE suggest that the damage growth in virgin C-C, in the high-cycle range, is slow at the initial stage of the cyclic life, but propagates rapidly after certain threshold cycles of the fatigue life.
Document ID
19930068547
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mahfuz, H.
(NASA Langley Research Center Hampton, VA, United States)
Das, P. S.
(NASA Langley Research Center Hampton, VA, United States)
Jeelani, S.
(Tuskegee Univ. AL, United States)
Baker, D. M.
(NASA Langley Research Center Hampton, VA, United States)
Johnson, S. A.
(General Dynamics Corp. Fort Worth, TX, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: International Journal of Fatigue
Volume: 15
Issue: 4
ISSN: 0142-1123
Subject Category
Composite Materials
Accession Number
93A52544
Funding Number(s)
CONTRACT_GRANT: NAS1-19157
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available