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Micromechanics of crenulated fibers in carbon/carbon compositesThe influence of crenulated noncircular fibers on the micromechanical stress states due to a transverse strain and to a temperature change in carbon/carbon composites is examined using the finite element method. Stresses at the interface of both fully bonded and fully disbonded fibers having two crenulation amplitudes and with two fiber volume fractions are presented. In each case, these interface stresses are compared to stresses at the interface of circular fibers which have the same degree of disbond and fiber volume fraction and are under the same loading conditions. For the disbonded cases, deformed meshes showing locations of fiber/matrix contact are also included. In addition to the interface stress states, selected composite properties are also computed and compared in each case examined. Interest in studying noncircular fibers stems from a desire to increase the transverse properties of carbon/carbon by introducing a mechanical interlocking between the fiber and the matrix. Results presented here indicate that this interlocking does in fact occur. Evidence from the interface stress data suggests, however, that any possible advantage of this interlocking may be outweighed by the disadvantage of stress concentrations which arise at the interface due to the crenulated geometry of the fibers.
Document ID
19930009578
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Carapella, E. E.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Hyer, M. W.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Griffin, O. H., Jr.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Maahs, H. G.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Composite Materials
Report/Patent Number
NASA-CR-192170
CCMS-93-01
VPI-E-93-01
NAS 1.26:192170
Accession Number
93N18767
Funding Number(s)
CONTRACT_GRANT: NAG1-343
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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