3-D Shear Lag Model for the Analysis of Interface Damage in Ceramic Matrix Composites


A discrete fiber model is developed in this paper and applied to study the problem of non-axisymmetric matrix cracking and interface debonding in unidirectional brittle-matrix composite materials subjected to a axial tensile load in the fiber direction. Considering the non-axisymmetry of the matrix crack and interface debond, a three-dimensional stress analysis is introduced into the above model. The variational approach based on the principle of minimum potential energy is employed to obtain the numerical results for the stress and displacement fields. On the basis of Irwin-Kies compliance calibration formulation, the strain energy release rates associated with the matrix crack and the interface debond are calculated. The competition between these two modes is then assessed by comparing the corresponding toughnesses. The stability of the debond and the matrix crack extension is investigated.


Mechanical and Aerospace Engineering

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Article - Conference proceedings

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Publication Date

01 Jan 1995

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