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Damage Assessment of Stress-Thermal Cycled High TemperatureWe report on the characterization of bismaleimide and polyimide carbon fiber composite, microcrack development under stress thermal cycling loading. Such cycle range from cryogenic temperatures associated with cryogenic fuel (LN, LOX) containment to high temperatures of 300 degrees associated with future hypervelocity aeropropulsion systems. Microcrack development thresholds as a function of temperature range of the thermal cycle, the number of cycles, and the applied stress level imposed on the composite are reported. We have conducted stress-thermal cycles on thin bismaleimide-woven carbon fiber foils for three temperature range cycles. The principle findings are that the full cycles from -196 degree celsius up to 250 degree celsius cause the most significant microcrack development. These observations indicate that the high temperature portion of the cycle under load causes fiber-matrix interface failure and subsequent exposure to higher stresses at the cryogenic, low temperature region results in composite matrix microcracking as a result of the additional stresses associated with the fiber-matrix thermal expansion mismatch. Our initial studies for 12 ply PMR-II-50 polyimide/M6OJB carbon fabric [0f, 90f, 90f, 0f, 0f, 90f] composites will be presented. The stress-thermal cycle test procedure for these will be described. Moisture absorption characteristics between cycles will be used to monitor interconnected microcrack development. The applied stress level will be 75 percent of the composite cryogenic -196 degree celsius ultimate strength.
Document ID
20040111375
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Ju, Jach-Yung
(Texas A&M Univ. College Station, TX, United States)
Prochazka, Michael
(Texas A&M Univ. College Station, TX, United States)
Ronke, Ben
(Texas A&M Univ. College Station, TX, United States)
Morgan, Roger
(Texas A&M Univ. College Station, TX, United States)
Shin, Eugene
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Propellants And Fuels
Report/Patent Number
Paper 1273
Meeting Information
Meeting: 14th International Conference on Composite Materials
Location: San Diego, CA
Country: United States
Start Date: July 14, 2003
End Date: July 18, 2003
Sponsors: Society of Mfg. Engineers, American Society for Composites
Funding Number(s)
OTHER: 708-31-16
Distribution Limits
Public
Copyright
Public Use Permitted.
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