Compressive Strength and Damage Mechanisms in Ceramic Materials.
Abstract
Compressive strength measurements as a function of temperature and loading rate, and microhardness measurements as a function of temperature, have been carried out for Al2O3, SiC, and Si3N4. Results are correlated in terms of current theories connecting compressive strength, hardness, fracture toughness, and indentation microfracture. It is found that while high loading rates can suppress high temperature intergranular compressive fracture in SiC, this is not true in Al2O3. The threshold crack size for indentation microfracture as a function of temperature seems to correlate at least as well (if not better) with compressive strength as with hardness, and temperature-controlled compressive fracture mechanisms seem to operate during indentation fracture at corresponding temperatures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1980
- Accession Number
- ADA081657
Entities
People
- James Lankford
Organizations
- Southwest Research Institute