| Autor: |
Yates, B., Overy, M. J., Sargent, J. P., McCalla, B. A., Kingston-Lee, D. M., Phillips, L. N., Rogers, K. F. |
| Zdroj: |
Journal of Materials Science; February 1978, Vol. 13 Issue: 2 p433-440, 8p |
| Abstrakt: |
Interferometric measurements of the linear thermal expansion coefficients of epoxy resin DLS 351/BF3400 are reported over the approximate temperature range 90 to 500 K. Corresponding measurements in directions parallel and perpendicular to the fibres are also reported for unidirectional composite bars of Courtaulds HTS carbon fibre in this resin, at nominal fibre volume contents of 50, 60 and 80%. The results are qualitatively similar to earlier observations upon resin ERLA 4617/mPDA-based specimens, but effects associated with resin softening occur at significantly higher temperatures in the case of resin DLS 351/BF3400. Current theoretical models account successfully for the influence of fibre volume fraction in the range 0.5 to 0.8 upon the value of the coefficient of thermal expansion at room temperature, within the limitations imposed by experimental uncertainty, provided that appropriate values are assigned to the linear thermal expansion coefficients of the fibres. In the directions parallel (a?f) and perpendicular (a?f) to the fibre axis these values have been selected from the ranges -10×10-7?f<-9×10-7 and 0.5×10-5?f<1.9×10-5. It is concluded that a more rigorous appraisal must await the availability of independent information concerning the directional thermoelastic properties of carbon fibres. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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