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Accession Number:
ADA191730
Title:
Effect of Uniaxial Stress on the Raman Spectra of Graphite Fibers.
Corporate Author:
MASSACHUSETTS INST OF TECH CAMBRIDGE
Report Date:
1987-10-30
Abstract:
Measurements of the effect of uniaxial stress on the frequency of the zone center optical phonons in heat-treated benzene-derived graphite fibers have been performed using first-order Raman scattering. Application of uniaxial stress along the fiber axis was found to cause polarization-dependent splittings and shifts of the Raman peaks of the zone center doubly degenerate optical phonons. From these observed splittings and shifts, experimental values for the phenomenological coefficients which describe the changes in the elastic constant of these phonons with strain were determined. It is concluded that Raman spectroscopy can be used to characterize the local stress or strain conditions of graphite fibers nondestructively. Keywords Effect of uniaxial stress, Raman spectra of carbon fibers, Raman microprobe spectroscopy, Single carbon fibers.
Descriptive Note:
Rept. for 1 Sep 86-31 Aug 87,
Supplementary Note:
Prepared in cooperation with Shinshu Univ., Nagano-shi (Japan). DOI: 10.21236/ADA191730
Pages:
0016
Contract Number:
F49629-85-C-0147
File Size:
0.71MB
