Advertisement

Application of Acousto-Ultrasonics for Predicting Hygrothermal Degradation of Unidirectional Glass-Fiber Composites

  • K. K. Phani
  • N. R. Bose

Abstract

Unidirectional composites made of glass fibers of two different glass compositions, ‘E’ and ‘N’, were exposed to water at different temperatures, and the degradation process was monitored with the acousto-ultrasonic technique. The study shows that the rate of degradation is dependent on glass composition, but the degradation mechanism is independent of glass composition. The strength data of two composites exposed to boiling water for different lengths of time correlated with the normalized stress wave factor. The strength predictions made at temperatures of 60°C and 80°C, based on this correlation, show close agreement with the experimentally measured values.

Keywords

Acoustic Emission Aging Time Flexural Strength Stress Wave Glass Composition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    K. H. G. Ashbee and R. C. Wyatt, Water Damage in Glass Fiber/Resin Composites, Proc. Roy. Soc. A312:553 (1969).ADSCrossRefGoogle Scholar
  2. 2.
    O. Ishai, Environmental Effects on Deformation, Strength and Degradation of Unidirectional Glass-Fiber Composites, Poly. Eng. Sci. 15:486 (1975).CrossRefGoogle Scholar
  3. 3.
    J. A. Aveston and J. M. Sillwood, in: “Advances in Composite Materials, Vol. I,” A. R. Bunsell, C. Bathias, A. Martrenchar, D. Henkes and G. Verchery, eds., Pergamon Press, Paris (1980).Google Scholar
  4. 4.
    B. J. Dewimilte, J. Thoris, R. Mailfert and A. R. Bunsell, in: “Advances in Composite Materials, Vol. I,” A. R. Bunsell, C. Bathias, A. Martrenchar, D. Henkes and G. Verchery, eds., Pergamon Press, Paris (1980).Google Scholar
  5. 5.
    A. Vary, Concepts and Techniques for Ultrasonic Evaluation of Material Mechanical Properties, in: “Mechanics of Nondestructive Testing,” W. W. Stinchcomb,ed., Plenum Press, New York (1980).Google Scholar
  6. 6.
    T. J. Fowler and R. S. Scarpellini, Acoustic Emission Testing of FRP Equipment-I, Chem Engrg. 10:145 (1980).Google Scholar
  7. 7.
    Idem, Acoustic Emission Testing of FRP Equipment-II, Chem Engrg. 11:293 (1980).*T. J. Fowler and R. S. Scarpellini,Google Scholar
  8. 8.
    M. G. Phillips and B. Harris, in: “Advances in Composites Materials, Vol. II,” A. R. Bunsell, C. Bathias, A. Martrenchar, D. Henkes and G. Verchery, eds., Pergamon Press, Paris (1980).Google Scholar
  9. 9.
    A. Vary and R. F. Clark, “Correlation of Fiber Composite Tensile Strength with the Ultrasonic Stress Wave Factor,” NASA TM-78846, NASA/LeRC, Cleveland (1978).Google Scholar
  10. 10.
    A. Vary and K. J. Bowles, “Use of an Ultrasonic-Acoustic Technique for Nondestructive Evaluation of Fiber Composite Strength,” NASA TM-73813, NASA/LeRC, Cleveland (1978).Google Scholar
  11. 11.
    A. Vary and K. J. Bowles, “Ultrasonic Evaluation of Strength of Unidirectional Graphite-Polyimide Composites,” NASA TM-X-73646, NASA/LeRC, Cleveland (1977).Google Scholar
  12. 12.
    J. C. Duke, Jr., E. G. Henneke, II, W. W. Stinchcomb and K. L. Reifsnider, Characterization of Composite Materials by Means of the Ultrasonic Stress Wave Factor, in: “Composite Structure, 2,” I. H. Marshall, ed., Applied Scientific Publishers, London (1983).Google Scholar
  13. 13.
    S. Kumar, Glass Composition for Spinning Fiber, J. Non-Crys. Solid 80:122 (1986) .ADSCrossRefGoogle Scholar
  14. 14.
    Technical Manual, Acoustic Emission Technology Corporation, July 15, 1981.Google Scholar
  15. 15.
    J. M. Whitney and G. E. Husman, Use of the Flexure Test for Determining Environmental Behavior of Fibrous Composites, Exp. Mech. 5:185 (1978).CrossRefGoogle Scholar
  16. 16.
    D. Lewis III, Curve Fitting Techniques and Ceramics, Am. Ceram. Soc. Bull. 57:434 (1978).Google Scholar

Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • K. K. Phani
    • 1
  • N. R. Bose
    • 1
  1. 1.Central Glass and Ceramic Research InstituteCalcuttaIndia

Personalised recommendations