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A damage tolerance comparison of 7075-T6 aluminum alloy and IM7/977-2 carbon/epoxyA comparison of low velocity impact damage between one of the strongest aluminum alloys, to a new, damage tolerant resin system as a matrix for high strength carbon fibers was examined in this study. The aluminum and composite materials were used as face sheets on a 0.13 g/cu cm aluminum honeycomb. Four levels of impact energy were used; 2.6 J, 5.3 J, 7.8 J and 9.9 J. The beams were compared for static strength and fatique life by use of the four-point bend flexure test. It was found that in the undamaged state the specific strength of the composite face sheets was about twice that of the aluminum face sheets. A sharp drop in strength was observed for the composite specimens impacted at the lowest (2.6J) energy level, but the overall specific strength was still higher than for the aluminum specimens. At all impact energy levels tested, the static specific strength of the composite face sheets were significantly higher than the aluminum face sheets. The fatigue life of the most severely damaged composite specimen was about 17 times greater than the undamaged aluminum specimens when cycled at 1 Hz between 20 percent and 85 percent of ultimate breaking load.
Document ID
19920027567
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nettles, Alan T.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Lance, David G.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hodge, Andrew J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Chemistry And Materials (General)
Meeting Information
Meeting: International SAMPE Symposium and Exhibition
Location: San Diego, CA
Country: United States
Start Date: April 15, 1991
End Date: April 18, 1991
Accession Number
92A10191
Distribution Limits
Public
Copyright
Other

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