Reliable Ceramic Structural Composites Designed with a Threshold Strength
Abstract
Laminar ceramics in which alternating layers of materials are bonded together exhibit a threshold strength if one set of layers has a compressive, residual stress. The threshold strength is substantial if the mechanical properties of the component ceramics are chosen wisely. Optimization of the threshold strength of a system with homogenous elastic properties in terms of layer thickness, fracture toughness and residual stress is presented. The best result is shown to be associated with the toughest material and the highest residual stress, but the choice of the laminar system exhibiting such features is limited to available ceramics. For each material system, the threshold strength is further optimized by making the layers as thin as possible. The thinness achievable will be limited by the technological processes used to make the laminar ceramic and material stability. If the system mechanical properties are favorable, the optimized threshold strength can be comparable in magnitude or much larger than the compressive, residual stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 2000
- Accession Number
- ADA386813
Entities
People
- Fred F. Lange
- Kais Hbaieb
- Robert M. Mcmeeking
Organizations
- University of California, Santa Barbara