Analysis of Non-Axisymmetric Cracking in Ceramic Matrix Composites
Final rept. 1 Jul 95-30 Jun 98
MISSOURI UNIV-ROLLA DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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Appropriate governing equations for the case of matrix cracking with debonding with friction along the debond have been derived. The variational approach founded on the principle of minimum potential energy is being applied to obtain the numerical results for the stress and displacement fields. On the basis of the Irwin-Kies compliance calibration formulation and the strain energy release rate criterion, the fracture analysis of the matrix crack is carried out. For the matrix crack configuration with interface debonding with friction, the critical loads have been obtained as a function of crack size and interface debond length to assess the competition between the matrix cracking and interface debonding modes. We have also completed static tests on transverse flex specimens to study the cracking behavior along and transverse to fiber direction in continuous and hybrid ceramic matrix composites. This work has been extended to include fiber pullout in model ceramic matrix composites and multiple cracking in laminated brittle matrix composites.
- Laminates and Composite Materials