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Fracture toughness in advanced monolithic ceramics - sepb versus sevenb methods
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Choi, S. R. Gyekenyesi, J. P. |
| Copyright Year | 2005 |
| Description | Fracture toughness of a total of 13 advanced monolithic ceramics including silicon nitrides, silicon carbide, aluminas, and glass ceramic was determined at ambient temperature by using both single edge precracked beam (SEPB) and single edge v-notched beam (SEVNB) methods. Relatively good agreement in fracture toughness between the two methods was observed for advanced ceramics with flat R-curves; whereas, poor agreement in fracture toughness was seen for materials with rising R-curves. The discrepancy in fracture toughness between the two methods was due to stable crack growth with crack closure forces acting in the wake region of cracks even in SEVNB test specimens. The effect of discrepancy in fracture toughness was analyzed in terms of microstructural feature (grain size and shape), toughening exponent, and stable crack growth determined using back-face strain gaging. |
| File Size | 331099 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050051857 |
| Archival Resource Key | ark:/13960/t9s22xx9g |
| Language | English |
| Publisher Date | 2005-03-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Grain Size Silicon Carbides Strain Gages Ceramics Crack Closure Crack Propagation V Grooves Ambient Temperature Beams Supports Silicon Nitrides Fracture Strength Microstructure 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 |
