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Fracture modes in off-axis fiber compositesCriteria were developed for identifying, characterizing, and quantifying fracture modes in high-modulus graphite-fiber/resin unidirectional composites subjected to off-axis tensile loading. Procedures are described which use sensitivity analyses and off-axis data to determine the uniaxial strength of fiber composites. It was found that off-axis composites fail by three fracture modes which produce unique fracture surface characteristics. The stress that dominates each fracture mode and the load angle range of its dominance can be identified. Linear composite mechanics is adequate to describe quantitatively the mechanical behavior of off-axis composites. The uniaxial strengths predicted from off-axis data are comparable to these measured in uniaxial tests.
Document ID
19790003983
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sinclair, J. H. (NASA Lewis Research Center Cleveland, OH, United States)
Chamis, C. C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1978
Subject Category
Composite Materials
Report/Patent Number
E-9836
NASA-TM-79036
Report Number: E-9836
Report Number: NASA-TM-79036
Meeting Information
Meeting: Ann. Conf. of the SPI Reinforced Plastics/Composites Inst.
Location: New Orleans, LA
Country: United States
Start Date: January 29, 1979
End Date: February 2, 1979
Accession Number
79N12154
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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