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Mechanics in Engineering ›› 2009, Vol. 31 ›› Issue (3): 39-43.doi: 10.6052/1000-0879-2008-296

• Application study • Previous Articles     Next Articles

STRESS-STRAIN BEHAVIOR IN 2D WEAVE CERAMIC MATRIX COMPOSITE

  

  • Received:2008-06-02 Revised:2008-06-30 Online:2009-06-08 Published:2009-06-08

Abstract: stress-strain behavior of 2D weave ceramic matrix composite is studied by experimental and theoretical methods. The 2D weave structure is simplified as a crossply structure and a fiber bundle undulation structure. Based on the matrix strength stochastic distribution theory and the fiber failure stochastic distribution theory, the stress-strain behavior and the tangent tensile modulus are obtained for unidirectional composite (0$^\circ$ ply). With the relationship between crossply and unidirectional ceramic matrix composite with the same material, the stress-strain behavior of crossply ceramic matrix composite can be obtained. A two-dimensional analytical method is proposed for fiber bundle undulation structure. With the composite strength model, the undulation structure is divided into sub-elements. The failure analysis is carried out considering the failure of different sub-elements in the fiber bundle undulation structure. Moreover, the stress-strain behavior of the undulation structure is obtained. Combining the crossply and the undulation structure's stress-strain behavior, the stress-strain behavior of of the 2D weave ceramic matrix composite is obtained; and the result agrees well with the experimental result.

Key words: ceramic matrix composite, 2D, fiber bundle undulation, strength model