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Fracture Mechanics Analyses of the Slip-Side Joggle Regions of Wing-Leading Edge PanelsThe Space Shuttle Orbiter wing comprises of 22 leading edge panels on each side of the wing. These panels are part of the thermal protection system that protects the Orbiter wings from extreme heating that take place on the reentry in to the earth atmosphere. On some panels that experience extreme heating, liberation of silicon carbon (SiC) coating was observed on the slip side regions of the panels. Global structural and local fracture mechanics analyses were performed on these panels as a part of the root cause investigation of this coating liberation anomaly. The wing-leading-edge reinforced carbon-carbon (RCC) panels, Panel 9, T-seal 10, and Panel 10, are shown in Figure 1 and the progression of the stress analysis models is presented in Figure 2. The global structural analyses showed minimal interaction between adjacent panels and the T-seal that bridges the gap between the panels. A bounding uniform temperature is applied to a representative panel and the resulting stress distribution is examined. For this loading condition, the interlaminar normal stresses showed negligible variation in the chord direction and increased values in the vicinity of the slip-side joggle shoulder. As such, a representative span wise slice on the panel can be taken and the cross section can be analyzed using plane strain analysis.
Document ID
20100026832
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Raju, Ivatury S. (NASA Langley Research Center Hampton, VA, United States)
Knight, Norman F., Jr. (General Dynamics Advanced Information Systems Chantilly, VA, United States)
Song, Kyongchan (ATK Space Systems Hampton, VA, United States)
Phillips, Dawn R. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
June 22, 2010
Subject Category
Structural Mechanics
Report/Patent Number
NF1676L-10869
Meeting Information
Meeting: 9th Youth Symposium on Experimental Solid Mechanics
Location: Trieste, Italy
Country: Italy
Start Date: July 7, 2010
End Date: July 10, 2010
Funding Number(s)
WBS: WBS 869021.03.07.01.11
Distribution Limits
Public
Copyright
Public Use Permitted.

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