Dynamic Behavior of Ceramic Composites
Abstract
Results obtained from our studies on the toughening mechanism, quantitative fractography and dynamic fracture of ceramics and ceramic matrix composites are summarized in this final report. One of the most significant accomplishments was to quantify, for the first time, the energy dissipation rate in the brittle silicon carbon(sub w)/aluminum oxide ceramic matrix composite (CMC) using moire interferometry together with finite element analysis. The same hybrid experimental-numerical analysis was also used to determine the resistance curve, which compared favorably with the theoretically predicted toughening effect, in titanium boride. A procedure for estimating the percentage areas of transgranular fracture in ceramics and CMC using line scanning profiles of scanning electron microscopy was developed. Larger percentage areas, which were determined by this procedure of transgranular fractures in Al2O3 and SiC(sub w)/ Al2O3, were related to rapid crack propagation thus suggesting a micromechanism which reduces the dynamic crack arrest capability of brittle material. A unique bar impact test was developed for clean dynamic fracture testing of ceramics and CMC's and was used to characterize the dynamic fracture responses of Al2O3 and SiC(sub w)/Al2O3.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1991
- Accession Number
- ADA243904
Entities
People
- Albert S. Kobayashi
- M. Taya
Organizations
- University of Washington