Reliable Ceramic Structural Composites Designed with a Threshold Strength
Report for 1 May 2000-30 Apr 2001
CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
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Finite element analysis was carried out to predict the threshold strength of a laminar ceramics loaded parallel to the layers. These materials are composed of alternate layers of two different ceramics in which residual stress is generated. Strength limiting cracks are trapped by the compressive layers and require a minimum threshold applied stress to cause them to fail the laminated ceramic. The calculations were utilized to study the influence of the elastic modulus mismatch between the alternate tensile and compressive layers. Good agreement was established between numerical simulations and theoretical results for materials involving layers with the same elastic properties. Results were obtained for a variety of combinations of different ceramics and suggest that threshold strength as high as three times the effective residual stress in the compressive layer is conceivable.
- Ceramics, Refractories and Glass
- Laminates and Composite Materials