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Creep Behavior of a Pitch‐Based Carbon Filament
Author(s) -
Kogure Kei,
Sines George,
Lavin J. Gerard
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb07878.x
Subject(s) - creep , materials science , necking , composite material , modulus , stress (linguistics) , ultimate tensile strength , deformation (meteorology) , activation energy , carbon fibers , philosophy , linguistics , chemistry , organic chemistry , composite number
New fabrication techniques were developed for uniaxial creep specimens of high‐strength, high elastic modulus, pitch‐based, carbon filaments, with a matrix‐free test section. Experiments show that pitch‐based carbon filaments with a tensile modulus of 896 GPa can exhibit, under high stress, large creep deformation without necking. The stress exponent for the pitch‐based fibers in the Dorn equation is much lower than that for PAN‐based fibers, while the activation energy is the same. The activation energies and activation volumes determined from the experiments suggest mechanisms of creep deformation.