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Fracture behavior of ceramics under displacement controlled loading
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Brewer, David Calomino, Anthony Ghosn Sr., Louis |
| Copyright Year | 1994 |
| Description | A Mode I fracture specimen and loading method has been developed which permits the observation of stable crack extension in monolithic and in situ toughened ceramics. The developed technique was used to conduct room temperature tests on commercial grade alumina (Coors' AD-995) and silicon nitride (Norton NC-132). The results of these tests are reported. Crack growth for the alumina remained subcritical throughout testing revealing possible effects of environmental stress corrosion. The crack growth resistance curve for the alumina is presented. The silicon nitride tests displayed a series of stable (slow) crack growth segments interrupted by dynamic (rapid) crack extension. Crack initiation and arrest stress intensity factors, K(sub Ic) and K(sub Ia), for silicon nitride are reported. The evolution of the specimen design through testing is briefly discussed. |
| File Size | 16735450 |
| Page Count | 27 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950004835 |
| Archival Resource Key | ark:/13960/t3b04330t |
| Language | English |
| Publisher Date | 1994-07-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Specimen Geometry Stress Corrosion Fracture Mechanics Stress Intensity Factors Silicon Nitrides Ceramics Fracture Strength Crack Arrest Aluminum Oxides Crack Initiation Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
