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Surface crack analysis applied to impact damage in a thick graphite-epoxy compositeThe residual tensile strength of a thick graphite/epoxy composite with impact damage was predicted using surface crack analysis. The damage was localized to a region directly beneath the impact site and extended only part way through the laminate. The damaged region contained broken fibers, and the locus of breaks in each layer resembled a crack perpendicular to the direction of the fibers. In some cases, the impacts broke fibers without making a visible crater. The impact damage was represented as a semi-elliptical surface crack with length and depth equal to that of the impact damage. The maximum length and depth of the damage were predicted with a stress analysis and a maximum shear stress criterion. The predictions and measurements of strength were in good agreement.
Document ID
19880013566
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Poe, C. C., Jr. (NASA Langley Research Center Hampton, VA, United States)
Harris, C. E. (NASA Langley Research Center Hampton, VA, United States)
Morris, D. H. (Virginia Polytechnic Inst. and State Univ. Blacksburg., United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1988
Subject Category
Composite Materials
Report/Patent Number
NASA-TM-100600
NAS 1.15:100600
Accession Number
88N22950
Funding Number(s)
PROJECT: RTOP 506-43-11-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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