Direct Thermomechanical Stress and Failure Mode Analyses of a Cloth Reinforced Ceramic Matrix Composite

  • Joseph W. Krynicki
  • Dennis C. Nagle
  • Robert E. GreenJr.


Virtually all composite systems have inherent thermomechanical stresses which arise from thermal expansion coefficient differentials between composite constituents. In the designing of any fiber reinforced composite, one needs to understand how these stresses arise in the processing of a composite and their effect on material performance in service. Since inherently brittle ceramics are often toughened through reinforcing fibers, the mechanical behavior of a ceramic matrix composite (CMC) is heavily influenced by the strength of its fiber/matrix interface, which is in turn directly related to the residual thermomechanical stresses present between the matrix and reinforcement. This study describes the use of photoelasticity to directly determine thermomechanical stresses in this engineering CMC. The use of acoustic emission (AE) and optical microscopy to characterize flexural test data in establishing fundamental failure mechanisms will also be discussed.


Acoustic Emission Ceramic Matrix Composite Glass Fiber Reinforce Plastic Acoustic Activity Thermomechanical Stress 
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  1. 1.
    R. A. Sambell, D. H. Bowen and D. C. Phillips, “Carbon Fiber Composites with Ceramic and Glass Matrices (Part 1 Discontinuous Fibers)”, Journal of Materials Science, 7 (1972) pp. 663–675.CrossRefGoogle Scholar
  2. 2.
    G. A. Dries and S. S. Tompkins, “Effects of Thermal Cycling on Graphite-Fiber-Reinforced 6061 Aluminum”, NASA Technical Paper 2612, (National Aeronautics and Space Administration Scientific and Technical Information Branch, 1986).Google Scholar
  3. 3.
    S. S. Tompkins and S. L. Williams, “Effects of Thermal Cycling on Mechanical Properties of Graphite Polyamide”, J. Spacecraft, (May-June 1984) pp. 274-280.Google Scholar
  4. 4.
    S. S. Tompkins, G. F. Sykes and D. E. Bowles, “The Thermal and Mechanical Stability of Composite Materials for Space Structures”, Presented at the IEEE/ASM/ASME/SME Space Technical Conference, 1985, Anaheim, California.Google Scholar
  5. 5.
    S. S. Tompkins, K. E. Ard and G. R. Sharp, “Thermal Expansion Behavior of Graphite/Glass and Graphite/Magnesium”, Presented at the 18th International Technical Conference Society for the Advancement of Materials and Process Engineering, 1986, Seattle, Washington.Google Scholar
  6. 6.
    S. S. Tompkins, “Effects of Thermal Cycling on Composite Materials for Space Structures”, Presented at the Space Environmental Effects on Materials Workshop, Sponsored by NASA Langley Research Center, 1988, Hampton, Virginia.Google Scholar
  7. 7.
    E. Hecht, Optics, Second Edition, (Addison-Wesley Publishing Company Inc., Reading, Massachusetts, 1987), p. 315.Google Scholar
  8. 8.
    I. M. Daniel and J. Durelli, “Shrinkage Stresses Around Rigid Inclusions”, Experimental Mechanics, (August 1962) pp. 240-244.Google Scholar
  9. 9.
    I. M. Daniel “Photoelastic Studies of Mechanics of Composites”, Progress in Experimental Mechanics, Durelli Anniversary Volume, V. J. Parks, ed., (The Catholic University of America, D. C, 1975) pp. 131–166.Google Scholar
  10. 10.
    T. Yoshino, T. Ohtsuka, and Y. Noguchi, “Stress Analysis by Photoelasticity and F. E. M. of Plane Woven Glass Fiber Reinforced Plastic Laminates”, Proceedings from Japan-U. S. Conference on Composite Materials, Tokyo, 1981, pp. 47-54.Google Scholar
  11. 11.
    T. Mah and M. G. Mendiratta, “Room Temperature Mechanical Behavior of Fiber-Reinforced Ceramic-Matrix Composites”, Journal of the American Ceramic Society, 68 [1] (1985) pp. C27–C30.Google Scholar
  12. 12.
    J. W. Krynicki, “Design and Behavior of a Ceramic Matrix Composite Subjected to Mechanical and Thermal Loading” Master of Science Essay, The Johns Hopkins University, Baltimore, Maryland, 1989.Google Scholar
  13. 13.
    D. J. Lloyd, K. Tangri, “Acoustic Emission From Al2O3-MO Fibre Composites”, Journal of Materials Science, 9 (1974) pp.482–486.CrossRefGoogle Scholar
  14. 14.
    J. Lankford, “Compressive Strength and Damage Mechanisms in a SiC-Fiber Reinforced Glass-Ceramic Matrix Composite”, Proceedings of the Fifth International Conference on Composite Materials, San Diego, CA, July 29-August 1, 1985 pp. 587-602.Google Scholar
  15. 15.
    M. J. Noone, R. L. Mehan “Observation of Crack Propagation in Polycrystalline Ceramics and Its Relationship to Acoustic Emissions”, Proceedings of the Symposium on Fracture Mechanics of Ceramics, University Park, PA, July 11-13 1973,1 pp. 201-229.Google Scholar

Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Joseph W. Krynicki
    • 1
  • Dennis C. Nagle
    • 1
    • 2
  • Robert E. GreenJr.
    • 1
  1. 1.Center for Nondestructive EvaluationThe Johns Hopkins UniversityBaltimoreUSA
  2. 2.Martin Marietta LaboratoriesBaltimoreUSA

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