Individual fibers were mounted on paper tabs for tensile
tests, and nominally 25 samples per group of fibers were
tested using a gage length of 10 mm. Fig. 4 displays modulus
and strength of various carbon fibers as a function of fiber
extension-during-carbonization (EDC). As expected, carbon fi-
bers with larger EDC displayed better tensile properties, due
to a higher molecular orientation. After compliance correction
for modulus (using shorter and longer gage lengths of 5
and 25 mm, per ASTM D-3379-5), carbon fibers displayed a
tensile modulus, strength, and strain-to-failure values of
52 ± 2 GPa, 1.04 ± 0.10 GPa, and 2.0 ± 0.2%, respectively. The
largest individual filament tensile strength recorded was
1.3 GPa. In contrast to the doubly-convex crenulations
observed for current fibers (shown schematically in Fig. 2c)
that result in sharp notches, fibers with smoother crenulations
(Fig. 2d) will likely possess better mechanical properties.
Thus, further dry-spinning studies will address the role of
spinning conditions in attaining an optimum level/shape of
crenulations
Individual fibers were mounted on paper tabs for tensiletests, and nominally 25 samples per group of fibers weretested using a gage length of 10 mm. Fig. 4 displays modulusand strength of various carbon fibers as a function of fiberextension-during-carbonization (EDC). As expected, carbon fi-bers with larger EDC displayed better tensile properties, dueto a higher molecular orientation. After compliance correctionfor modulus (using shorter and longer gage lengths of 5and 25 mm, per ASTM D-3379-5), carbon fibers displayed atensile modulus, strength, and strain-to-failure values of52 ± 2 GPa, 1.04 ± 0.10 GPa, and 2.0 ± 0.2%, respectively. Thelargest individual filament tensile strength recorded was1.3 GPa. In contrast to the doubly-convex crenulationsobserved for current fibers (shown schematically in Fig. 2c)that result in sharp notches, fibers with smoother crenulations(Fig. 2d) will likely possess better mechanical properties.Thus, further dry-spinning studies will address the role ofspinning conditions in attaining an optimum level/shape ofcrenulations
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