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Record Details

Record 24 of 3300
A damage tolerance comparison of 7075-T6 aluminum alloy and IM7/977-2 carbon/epoxy
Author and Affiliation:
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)
Abstract: A 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.
Publication Date: Jan 01, 1991
Document ID:
19920027567
(Acquired Nov 22, 1995)
Accession Number: 92A10191
Subject Category: CHEMISTRY AND MATERIALS (GENERAL)
Document Type: Conference Paper
Publication Information: (SEE A92-10126)
Publisher Information: United States
Meeting Information: International SAMPE Symposium and Exhibition; 36th; Apr. 15-18, 1991; San Diego, CA; United States
Financial Sponsor: NASA; United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ALUMINUM ALLOYS; DAMAGE ASSESSMENT; GRAPHITE-EPOXY COMPOSITES; HONEYCOMB STRUCTURES; IMPACT TESTS; IMPACT TOLERANCES; SANDWICH STRUCTURES; BEND TESTS; FATIGUE (MATERIALS); LOW SPEED; PANELS; WROUGHT ALLOYS
Imprint And Other Notes: IN: International SAMPE Symposium and Exhibition, 36th, San Diego, CA, Apr. 15-18, 1991, Proceedings. Book 1 (A92-10126 01-23). Covina, CA, Society for the Advancement of Material and Process Engineering, 1991, p. 924-931.
Availability Source: Other Sources
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