Evaluation of Stress Relaxation in a Broken Fiber for a Single Carbon Fiber/Epoxy Composite by Raman Spectroscopy.

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  • ラマン分光による炭素繊維／エポキシ複合材内の破断繊維における応力緩和挙動の評価
  • ラマン ブンコウ ニヨル タンソ センイ エポキシ フクゴウザイナイ ノ ハダ

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Raman spectroscopy was used to study the stress relaxation in broken fibers in long fiber reinforced unidirectional composites. A single-fiber model composite consisting of a high modulus PAN carbon fiber and an epoxy resin matrix was subjected to constant overall strain, which was applied to induce a fiber break. The stress profile in the broken fiber was then monitored for 1000 hours by determining fiber stress through the stress dependence of the 2700cm-1 Raman band peak position. Interfacial shear stress was also evaluated from the axial distribution of fiber stress. It was thus observed that the stress profile in the broken fiber changed a little after 1000 hours whereas the normal stress in the matrix relaxed to about a quarter of the initial value in about 200 hours. It is discussed that this result, which does not agree with the linear viscoelastic analysis reported, is attributable to the matrix plasticity and/or interfacial shear sliding near the fiber break.

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