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Accelerated testing methodology in constant stress-rate testing for advanced structural ceramics: a preloading technique
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Choi, Han-Ho Gyekenyesi, John P. Bartlett, Allen Huebert, Dean Choi, Sung R. |
| Copyright Year | 2001 |
| Description | Preloading technique was used as a means of an accelerated testing methodology in constant stress-rate (dynamic fatigue) testing for two different brittle materials. The theory developed previously for fatigue strength as a function of preload was further verified through extensive constant stress-rate testing for glass-ceramic and CRT glass in room temperature distilled water. The preloading technique was also used in this study to identify the prevailing failure mechanisms at elevated temperatures, particularly at lower test rates in which a series of mechanisms would be associated simultaneously with material failure, resulting in significant strength increase or decrease. Two different advanced ceramics including SiC whisker-reinforced composite silicon nitride and 96 wt% alumina were used at elevated temperatures. It was found that the preloading technique can be used as an additional tool to pinpoint the dominant failure mechanism that is associated with such a phenomenon of considerable strength increase or decrease. |
| File Size | 586534 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020038559 |
| Archival Resource Key | ark:/13960/t7np7152s |
| Language | English |
| Publisher Date | 2001-01-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Fatigue Tests Whisker Composites Accelerated Life Tests High Temperature Tests Silicon Nitrides Ceramics Prestressing Brittle Materials Aluminum Oxides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
