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

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

Abstract

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.

Keywords

Acoustic Emission Ceramic Matrix Composite Glass Fiber Reinforce Plastic Acoustic Activity Thermomechanical Stress 
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.

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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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