Static Fatigue of Ceramic Materials.
Abstract
Time-dependent failure in the temperature range zero to 900C of four ceramic materials is being studied by four-point bend testing at different strain rates. The standard environment for testing is water-saturated air at room temperature. The materials are sapphire, Wesgo Al 995 alumina, Norton NC-132 hot-pressed silicon nitride, and Norton NC-350 reaction-sintered silicon nitride. The purpose of the investigation is to identify the temperature range where static fatigue phenomena are important and subsequently to identify the moisture related stress corrosion processes which occur. Variable strain rate tests at different humidities indicated this time-dependent failure was moisture related. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1974
- Accession Number
- AD0774934
Entities
People
- Arthur G. Metcalfe
- Mary E. Gulden