Coating of carbon fibers -- The strength of the fibers

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08372.x· OSTI ID:182653

Helmer, T ^[1]; Peterlik, H; Kromp, K ^[2]

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1. Alusingen GmbH, Singen (Germany)
2. Univ. Wien, Vienna (Austria). Inst. fuer Festkoerperphysik

The 6k carbon fiber Torayca T800H was coated with pyrolytic carbon by a CVD process. Fiber bundles were tested and evaluated. By this procedure, the whole distribution of the failure probability with respect to the fiber strength is obtained in a single experiment. The 50% strength of the fiber bundle, i.e., the strength at which 50% of the fibers in the bundle are broken, is inversely proportional to the square root of the thickness of the coating. By relating the strength to the defect size according to linear-elastic fracture mechanics (LEFM), the probability density function of the defects was derived. It is Weibull-shaped for the uncoated fiber and shows an increasing bimodal shape for the increasing coating thicknesses.

• Sponsoring Organization: USDOE
• OSTI ID: 182653
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACETYLENE
ARGON
CARBON FIBERS
CHEMICAL VAPOR DEPOSITION
DEFECTS
FAILURES
FRACTURE MECHANICS
FRICTION
INTERFACES
NITROGEN
PROBABILITY
PYROLYTIC CARBON
STRAIN RATE
TENSILE PROPERTIES