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Damage tolerance of a composite sandwich with interleaved foam coreA composite sandwich panel consisting of carbon fiber-reinforced plastic (CFRP) skins and a syntactic foam core was selected as an appropriate structural concept for the design of wind tunnel compressor blades. Interleaving of the core with tough interlayers was done to prevent core cracking and to improve damage tolerance of the sandwich. Simply supported sandwich beam specimens were subjected to low-velocity drop-weight impacts as well as high velocity ballistic impacts. The performance of the interleaved core sandwich panels was characterized by localized skin damage and minor cracking of the core. Residual compressive strength (RCS) of the skin, which was derived from flexural test, shows the expected trend of decreasing with increasing size of the damage, impact energy, and velocity. In the case of skin damage, RCS values of around 50 percent of the virgin interleaved reference were obtained at the upper impact energy range. Based on the similarity between low-velocity and ballistic-impact effects, it was concluded that impact energy is the main variable controlling damage and residual strength, where as velocity plays a minor role.
Document ID
19930028546
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ishai, Ori
(NASA Ames Research Center Moffett Field, CA; Technion - Israel Inst. of Technology, Haifa, United States)
Hiel, Clement
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Journal of Composites Technology & Research
Volume: 14
Issue: 3
ISSN: 0885-6804
Subject Category
Structural Mechanics
Accession Number
93A12543
Distribution Limits
Public
Copyright
Other

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